General Purpose Operating System SRG

V1R4 2016-04-25       U_General_Purpose_Operating_System_V1R4_Manual-xccdf.xml
V1R2 2015-06-26       U_General_Purpose_Operating_System_V1R2_Manual-xccdf.xml
The General Purpose Operating System Security Requirements Guide (SRG) is published as a tool to improve the security of Department of Defense (DoD) information systems. Comments or proposed revisions to this document should be sent via e-mail to the following address: [email protected]
Comparison
All 198
No Change 187
Updated 10
Added 1
Removed 0
V-56571 No Change
Findings ID: SRG-OS-000001-GPOS-00001 Rule ID: SV-70831r1_rule Severity: medium CCI: CCI-000015

Discussion

Enterprise environments make account management challenging and complex. A manual process for account management functions adds the risk of a potential oversight or other errors.

A comprehensive account management process that includes automation helps to ensure accounts designated as requiring attention are consistently and promptly addressed. Examples include, but are not limited to, using automation to take action on multiple accounts designated as inactive, suspended or terminated, or by disabling accounts located in non-centralized account stores such as multiple servers. This requirement applies to all account types, including individual/user, shared, group, system, guest/anonymous, emergency, developer/manufacturer/vendor, temporary, and service.

The automated mechanisms may reside within the operating system itself or may be offered by other infrastructure providing automated account management capabilities. Automated mechanisms may be composed of differing technologies that, when placed together, contain an overall automated mechanism supporting an organization's automated account management requirements.

Account management functions include: assigning group or role membership; identifying account type; specifying user access authorizations (i.e., privileges); account removal, update, or termination; and administrative alerts. The use of automated mechanisms can include, for example: using email or text messaging to automatically notify account managers when users are terminated or transferred; using the information system to monitor account usage; and using automated telephonic notification to report atypical system account usage.

Checks

Verify the operating system provides automated mechanisms for supporting account management functions. If it does not, this is a finding.

Fix

Configure the operating system to provide automated mechanisms for supporting account management functions.
V-56573 No Change
Findings ID: SRG-OS-000480-GPOS-00232 Rule ID: SV-70833r1_rule Severity: medium CCI: CCI-000366

Discussion

Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.

Checks

Verify the operating system enabled an application firewall, if available. If it does not, this is a finding. If the operating system does not support an application firewall, this may be downgraded to a CAT III finding.

Fix

Ensure the operating system's application firewall is enabled, if available.
V-56575 No Change
Findings ID: SRG-OS-000002-GPOS-00002 Rule ID: SV-70835r1_rule Severity: medium CCI: CCI-000016

Discussion

If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be used to gain unauthorized access. To mitigate this risk, automated termination of all temporary accounts must be set upon account creation.

Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation.

If temporary accounts are used, the operating system must be configured to automatically terminate these types of accounts after a DoD-defined time period of 72 hours.

To address access requirements, many operating systems may be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system automatically removes or disables local temporary user accounts after 72 hours. If it does not, this is a finding.

Fix

Configure the operating system to automatically remove or disable local temporary user accounts after 72 hours.
V-56577 Updated
Findings ID: SRG-OS-000004-GPOS-00004 Rule ID: SV-70837r12_rule Severity: medium CCI: CCI-000018

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a newn account. Auditing of account creation mitigates this riskactions provides logging that can be used for forensic purposes.

To address access requirements, many operating systems may be integrated with enterprise
- level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system automatically audits account creation. If it does not, this is a finding.

Fix

Configure the operating system to automatically audit account creation.
V-56579 No Change
Findings ID: SRG-OS-000021-GPOS-00005 Rule ID: SV-70839r1_rule Severity: medium CCI: CCI-000044

Discussion

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

Checks

Verify that the operating system enforces the limit of three consecutive invalid logon attempts by a user during a 15-minute time period. If it does not, this is a finding.

Fix

Configure the operating system to enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period.
V-56581 No Change
Findings ID: SRG-OS-000480-GPOS-00231 Rule ID: SV-70841r1_rule Severity: medium CCI: CCI-000366

Discussion

Failure to restrict network connectivity only to authorized systems permits inbound connections from malicious systems. It also permits outbound connections that may facilitate exfiltration of DoD data.

Checks

Verify the operating system employs a deny-all, allow-by-exception firewall policy for allowing connections to other systems. If it does not, this is a finding.

Fix

Configure the operating system to employ a deny-all, allow-by-exception firewall policy for allowing connections to other systems.
V-56583 No Change
Findings ID: SRG-OS-000480-GPOS-00230 Rule ID: SV-70843r1_rule Severity: medium CCI: CCI-000366

Discussion

Users' home directories/folders may contain information of a sensitive nature. Non-privileged users should coordinate any sharing of information with an SA through shared resources.

Checks

Verify the operating system limits the ability of non-privileged users to grant other users direct access to the contents of their home directories/folders. If it does not, this is a finding.

Fix

Configure the operating system to limit the ability of non-privileged users to grant other users direct access to the contents of their home directories/folders.
V-56585 No Change
Findings ID: SRG-OS-000023-GPOS-00006 Rule ID: SV-70845r1_rule Severity: medium CCI: CCI-000048

Discussion

Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.

System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist.

The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:

"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.

By using this IS (which includes any device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner:

"I've read & consent to terms in IS user agreem't."

Checks

Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the system.

The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:

"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.

By using this IS (which includes any device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner:

"I've read & consent to terms in IS user agreem't."

If it does not, this is a finding.

Fix

Configure the operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system.

The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:

"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.

By using this IS (which includes any device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner:

"I've read & consent to terms in IS user agreem't."

If it does not, this is a finding.
V-56587 No Change
Findings ID: SRG-OS-000480-GPOS-00229 Rule ID: SV-70847r1_rule Severity: medium CCI: CCI-000366

Discussion

Failure to restrict system access to authenticated users negatively impacts operating system security.

Checks

If the operating system provides a public access service, such as a kiosk, this is not applicable. Verify the operating system does not allow an unattended or automatic logon to the system. If it does, this is a finding. Automatic logon as an authorized user allows access to any user with physical access to the operating system.

Fix

If the operating system provides a public access service, such as a kiosk, this is not applicable. Configure the operating system to not allow an unattended or automatic logon to the system. Automatic logon as an authorized user allows access to any user with physical access to the operating system.
V-56589 No Change
Findings ID: SRG-OS-000480-GPOS-00228 Rule ID: SV-70849r1_rule Severity: medium CCI: CCI-000366

Discussion

Setting the most restrictive default permissions ensures that when new accounts are created they do not have unnecessary access.

Checks

Verify the operating system defines default permissions for all authenticated users in such a way that the user can only read and modify their own files. If it does not, this is a finding.

Fix

Configure the operating system to define default permissions for all authenticated users in such a way that the user can only read and modify their own files.
V-56591 No Change
Findings ID: SRG-OS-000480-GPOS-00227 Rule ID: SV-70851r1_rule Severity: medium CCI: CCI-000366

Discussion

Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements.

Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections.

Checks

Verify the operating system is configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs. If it is not, this is a finding.

Fix

Configure the operating system in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs.
V-56593 No Change
Findings ID: SRG-OS-000024-GPOS-00007 Rule ID: SV-70853r1_rule Severity: medium CCI: CCI-000050

Discussion

The banner must be acknowledged by the user prior to allowing the user access to the operating system. This provides assurance that the user has seen the message and accepted the conditions for access. If the consent banner is not acknowledged by the user, DoD will not be in compliance with system use notifications required by law.

To establish acceptance of the application usage policy, a click-through banner at system logon is required. The system must prevent further activity until the user executes a positive action to manifest agreement by clicking on a box indicating "OK".

Checks

Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner until users acknowledge the usage conditions and take explicit actions to log on for further access. If it does not, this is a finding.

Fix

Configure the operating system to display the Standard Mandatory DoD Notice and Consent Banner until users acknowledge the usage conditions and take explicit actions to log on for further access.
V-56595 No Change
Findings ID: SRG-OS-000480-GPOS-00226 Rule ID: SV-70855r1_rule Severity: medium CCI: CCI-000366

Discussion

Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account.

Checks

Verify the operating system enforces a delay of at least 4 seconds between logon prompts following a failed logon attempt. If it does not, this is a finding.

Fix

Configure the operating system to enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.
V-56597 No Change
Findings ID: SRG-OS-000480-GPOS-00225 Rule ID: SV-70857r1_rule Severity: medium CCI: CCI-000366

Discussion

If the operating system allows the user to select passwords based on dictionary words, then this increases the chances of password compromise by increasing the opportunity for successful guesses and brute-force attacks.

Checks

Verify the operating system prevents the use of dictionary words for passwords. If it does not, this is a finding.

Fix

Configure the operating system to prevent the use of dictionary words for passwords.
V-56599 No Change
Findings ID: SRG-OS-000479-GPOS-00224 Rule ID: SV-70859r1_rule Severity: medium CCI: CCI-001851

Discussion

Information stored in one location is vulnerable to accidental or incidental deletion or alteration.

Off-loading is a common process in information systems with limited audit storage capacity.

Checks

Verify the operating system, at a minimum, off-loads interconnected systems in real time and off-loads standalone systems weekly. If it does not, this is a finding.

Fix

Configure the operating system to, at a minimum, off-load interconnected systems in real time and off-load standalone systems weekly.
V-56601 No Change
Findings ID: SRG-OS-000478-GPOS-00223 Rule ID: SV-70861r1_rule Severity: medium CCI: CCI-002450

Discussion

Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated.

Checks

Verify the operating system implements NIST FIPS-validated cryptography for the following: to provision digital signatures, to generate cryptographic hashes, and to protect unclassified information requiring confidentiality and cryptographic protection in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards. If it does not, this is a finding.

Fix

Configure the operating system to implement NIST FIPS-validated cryptography for the following: to provision digital signatures, to generate cryptographic hashes, and to protect unclassified information requiring confidentiality and cryptographic protection in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.
V-56603 No Change
Findings ID: SRG-OS-000477-GPOS-00222 Rule ID: SV-70863r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records for all kernel module load, unload, and restart actions, and also for all program initiations. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records for all kernel module load, unload, and restart actions, and also for all program initiations.
V-56605 No Change
Findings ID: SRG-OS-000476-GPOS-00221 Rule ID: SV-70865r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records for all account creations, modifications, disabling, and termination events. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events.
V-56607 No Change
Findings ID: SRG-OS-000475-GPOS-00220 Rule ID: SV-70867r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records for all direct access to the information system. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records for all direct access to the information system.
V-56609 No Change
Findings ID: SRG-OS-000474-GPOS-00219 Rule ID: SV-70869r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful accesses to objects occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful accesses to objects occur.
V-56611 No Change
Findings ID: SRG-OS-000473-GPOS-00218 Rule ID: SV-70871r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when concurrent logons to the same account occur from different sources. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when concurrent logons to the same account occur from different sources.
V-56613 No Change
Findings ID: SRG-OS-000472-GPOS-00217 Rule ID: SV-70873r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records showing starting and ending time for user access to the system. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records showing starting and ending time for user access to the system.
V-56615 No Change
Findings ID: SRG-OS-000471-GPOS-00216 Rule ID: SV-70875r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the audit system is configured to audit the loading and unloading of dynamic kernel modules. If it does not, this is a finding.

Fix

Configure the audit system to audit the loading and unloading of dynamic kernel modules.
V-56617 No Change
Findings ID: SRG-OS-000471-GPOS-00215 Rule ID: SV-70877r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records for privileged activities or other system-level access. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records for privileged activities or other system-level access.
V-56619 No Change
Findings ID: SRG-OS-000470-GPOS-00214 Rule ID: SV-70879r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful logon attempts occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful logon attempts occur.
V-56621 No Change
Findings ID: SRG-OS-000468-GPOS-00212 Rule ID: SV-70881r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to delete security objects occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to delete security objects occur.
V-56623 No Change
Findings ID: SRG-OS-000467-GPOS-00211 Rule ID: SV-70883r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to delete security levels occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to delete security levels occur.
V-56625 No Change
Findings ID: SRG-OS-000466-GPOS-00210 Rule ID: SV-70885r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to delete privileges occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to delete privileges occur.
V-56627 No Change
Findings ID: SRG-OS-000465-GPOS-00209 Rule ID: SV-70887r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to modify categories of information (e.g., classification levels) occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to modify categories of information (e.g., classification levels) occur.
V-56629 No Change
Findings ID: SRG-OS-000027-GPOS-00008 Rule ID: SV-70889r1_rule Severity: medium CCI: CCI-000054

Discussion

Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to DoS attacks.

This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system.

Checks

Verify the operating system limits the number of concurrent sessions to ten for all accounts and/or account types. If it does not, this is a finding.

Fix

Configure the operating system to limit the number of concurrent sessions to ten for all accounts and/or account types.
V-56631 No Change
Findings ID: SRG-OS-000028-GPOS-00009 Rule ID: SV-70891r1_rule Severity: medium CCI: CCI-000056

Discussion

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.

The session lock is implemented at the point where session activity can be determined.

Regardless of where the session lock is determined and implemented, once invoked, the session lock shall remain in place until the user re-authenticates. No other activity aside from re-authentication shall unlock the system.

Checks

Verify the operating system retains a user's session lock until that user reestablishes access using established identification and authentication procedures. If it does not, this is a finding.

Fix

Configure the operating system to retain a user's session lock until that user reestablishes access using established identification and authentication procedures.
V-56633 No Change
Findings ID: SRG-OS-000029-GPOS-00010 Rule ID: SV-70893r1_rule Severity: medium CCI: CCI-000057

Discussion

A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.

The session lock is implemented at the point where session activity can be determined and/or controlled.

Checks

Verify the operating system initiates a session lock after a 15-minute period of inactivity for all connection types. If it does not, this is a finding.

Fix

Configure the operating system to initiate a session lock after a 15-minute period of inactivity for all connection types.
V-56635 No Change
Findings ID: SRG-OS-000030-GPOS-00011 Rule ID: SV-70895r1_rule Severity: medium CCI: CCI-000058

Discussion

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.

The session lock is implemented at the point where session activity can be determined. Rather than be forced to wait for a period of time to expire before the user session can be locked, operating systems need to provide users with the ability to manually invoke a session lock so users may secure their session should the need arise for them to temporarily vacate the immediate physical vicinity.

Checks

Verify the operating system provides the capability for users to directly initiate a session lock for all connection types. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability for users to directly initiate a session lock for all connection types.
V-56637 No Change
Findings ID: SRG-OS-000031-GPOS-00012 Rule ID: SV-70897r1_rule Severity: medium CCI: CCI-000060

Discussion

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence.

The session lock is implemented at the point where session activity can be determined. The operating system session lock event must include an obfuscation of the display screen so as to prevent other users from reading what was previously displayed.

Publicly viewable images can include static or dynamic images, for example, patterns used with screen savers, photographic images, solid colors, a clock, a battery life indicator, or a blank screen, with the additional caveat that none of the images convey sensitive information.

Checks

Verify the operating system conceals, via the session lock, information previously visible on the display with a publicly viewable image. If it does not, this is a finding.

Fix

Configure the operating system to conceal, via the session lock, information previously visible on the display with a publicly viewable image.
V-56639 No Change
Findings ID: SRG-OS-000032-GPOS-00013 Rule ID: SV-70899r1_rule Severity: medium CCI: CCI-000067

Discussion

Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access management difficult at best.

Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.

Automated monitoring of remote access sessions allows organizations to detect cyber attacks and also ensure ongoing compliance with remote access policies by auditing connection activities of remote access capabilities, such as Remote Desktop Protocol (RDP), on a variety of information system components (e.g., servers, workstations, notebook computers, smartphones, and tablets).

Checks

Verify the operating system monitors remote access methods. If it does not, this is a finding.

Fix

Configure the operating system to monitor remote access methods.
V-56641 No Change
Findings ID: SRG-OS-000033-GPOS-00014 Rule ID: SV-70901r1_rule Severity: medium CCI: CCI-000068

Discussion

Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session.

Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.

Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information.

Checks

Verify the operating system implements DoD-approved encryption to protect the confidentiality of remote access sessions. If it does not, this is a finding.

Fix

Configure the operating system to implement DoD-approved encryption to protect the confidentiality of remote access sessions.
V-56643 No Change
Findings ID: SRG-OS-000463-GPOS-00207 Rule ID: SV-70903r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to modify security objects occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to modify security objects occur.
V-56645 No Change
Findings ID: SRG-OS-000462-GPOS-00206 Rule ID: SV-70905r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to modify privileges occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to modify privileges occur.
V-56647 No Change
Findings ID: SRG-OS-000037-GPOS-00015 Rule ID: SV-70907r1_rule Severity: medium CCI: CCI-000130

Discussion

Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack.

Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked.

Associating event types with detected events in the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.

Checks

Verify the operating system produces audit records containing information to establish what type of events occurred. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing information to establish what type of events occurred.
V-56649 No Change
Findings ID: SRG-OS-000038-GPOS-00016 Rule ID: SV-70909r1_rule Severity: medium CCI: CCI-000131

Discussion

Without establishing when events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack.

In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know when events occurred (date and time).

Associating event types with detected events in the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.

Checks

Verify the operating system produces audit records containing information to establish when (date and time) the events occurred. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing information to establish when (date and time) the events occurred.
V-56651 No Change
Findings ID: SRG-OS-000039-GPOS-00017 Rule ID: SV-70911r1_rule Severity: medium CCI: CCI-000132

Discussion

Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack.

In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know where events occurred, such as operating system components, modules, device identifiers, node names, file names, and functionality.

Associating information about where the event occurred within the operating system provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.

Checks

Verify the operating system produces audit records containing information to establish where the events occurred. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing information to establish where the events occurred.
V-56653 No Change
Findings ID: SRG-OS-000040-GPOS-00018 Rule ID: SV-70913r1_rule Severity: medium CCI: CCI-000133

Discussion

Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack.

In addition to logging where events occur within the operating system, the operating system must also generate audit records that identify sources of events. Sources of operating system events include, but are not limited to, processes and services.

In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know the source of the event.

Checks

Verify the operating system produces audit records containing information to establish the source of the events. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing information to establish the source of the events.
V-56655 No Change
Findings ID: SRG-OS-000041-GPOS-00019 Rule ID: SV-70915r1_rule Severity: medium CCI: CCI-000134

Discussion

Without information about the outcome of events, security personnel cannot make an accurate assessment as to whether an attack was successful or if changes were made to the security state of the system.

Event outcomes can include indicators of event success or failure and event-specific results (e.g., the security state of the information system after the event occurred). As such, they also provide a means to measure the impact of an event and help authorized personnel to determine the appropriate response.

Checks

Verify the operating system produces audit records containing information to establish the outcome of the events. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing information to establish the outcome of the events.
V-56657 No Change
Findings ID: SRG-OS-000042-GPOS-00020 Rule ID: SV-70917r1_rule Severity: medium CCI: CCI-000135

Discussion

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.

At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.

Checks

Verify the operating system generates audit records containing the full-text recording of privileged commands. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records containing the full-text recording of privileged commands.
V-56659 No Change
Findings ID: SRG-OS-000042-GPOS-00021 Rule ID: SV-70919r1_rule Severity: medium CCI: CCI-000135

Discussion

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.

At a minimum, the organization must audit the individual identities of group users. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the actual account involved in the activity.

Checks

Verify the operating system produces audit records containing the individual identities of group account users. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing the individual identities of group account users.
V-56661 No Change
Findings ID: SRG-OS-000046-GPOS-00022 Rule ID: SV-70921r1_rule Severity: medium CCI: CCI-000139

Discussion

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected.

Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded.

This requirement applies to each audit data storage repository (i.e., distinct information system component where audit records are stored), the centralized audit storage capacity of organizations (i.e., all audit data storage repositories combined), or both.

Checks

Verify the operating system alerts the ISSO and SA (at a minimum) in the event of an audit processing failure. If it does not, this is a finding.

Fix

Configure the operating system to alert the ISSO and SA (at a minimum) in the event of an audit processing failure.
V-56663 No Change
Findings ID: SRG-OS-000047-GPOS-00023 Rule ID: SV-70923r1_rule Severity: medium CCI: CCI-000140

Discussion

It is critical that when the operating system is at risk of failing to process audit logs as required, it takes action to mitigate the failure. Audit processing failures include: software/hardware errors; failures in the audit capturing mechanisms; and audit storage capacity being reached or exceeded. Responses to audit failure depend upon the nature of the failure mode.

When availability is an overriding concern, other approved actions in response to an audit failure are as follows:

1) If the failure was caused by the lack of audit record storage capacity, the operating system must continue generating audit records if possible (automatically restarting the audit service if necessary), overwriting the oldest audit records in a first-in-first-out manner.

2) If audit records are sent to a centralized collection server and communication with this server is lost or the server fails, the operating system must queue audit records locally until communication is restored or until the audit records are retrieved manually. Upon restoration of the connection to the centralized collection server, action should be taken to synchronize the local audit data with the collection server.

Checks

Verify the operating system shuts down by default upon audit failure (unless availability is an overriding concern). If it does not, this is a finding.

Fix

Configure the operating system to shut down by default upon audit failure (unless availability is an overriding concern).
V-56665 No Change
Findings ID: SRG-OS-000051-GPOS-00024 Rule ID: SV-70925r1_rule Severity: medium CCI: CCI-000154

Discussion

Successful incident response and auditing relies on timely, accurate system information and analysis in order to allow the organization to identify and respond to potential incidents in a proficient manner. If the operating system does not provide the ability to centrally review the operating system logs, forensic analysis is negatively impacted.

Segregation of logging data to multiple disparate computer systems is counterproductive and makes log analysis and log event alarming difficult to implement and manage, particularly when the system has multiple logging components writing to different locations or systems.

To support the centralized capability, the operating system must be able to provide the information in a format that can be extracted and used, allowing the application performing the centralization of the log records to meet this requirement.

Checks

Verify the operating system provides the capability to centrally review and analyze audit records from multiple components within the system. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability to centrally review and analyze audit records from multiple components within the system.
V-56667 No Change
Findings ID: SRG-OS-000054-GPOS-00025 Rule ID: SV-70927r1_rule Severity: medium CCI: CCI-000158

Discussion

The ability to specify the event criteria that are of interest provides the individuals reviewing the logs with the ability to quickly isolate and identify these events without having to review entries that are of little or no consequence to the investigation. Without this capability, forensic investigations are impeded.

Events of interest can be identified by the content of specific audit record fields, including, for example, identities of individuals, event types, event locations, event times, event dates, system resources involved, IP addresses involved, or information objects accessed. Organizations may define audit event criteria to any degree of granularity required, for example, locations selectable by general networking location (e.g., by network or subnetwork) or selectable by specific information system component.

This requires operating systems to provide the capability to customize audit record reports based on all available criteria.

Checks

Verify the operating system provides the capability to filter audit records for events of interest based upon all audit fields within audit records. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability to filter audit records for events of interest based upon all audit fields within audit records.
V-56669 No Change
Findings ID: SRG-OS-000055-GPOS-00026 Rule ID: SV-70929r1_rule Severity: medium CCI: CCI-000159

Discussion

Without an internal clock used as the reference for the time stored on each event to provide a trusted common reference for the time, forensic analysis would be impeded. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events.

If the internal clock is not used, the system may not be able to provide time stamps for log messages. Additionally, externally generated time stamps may not be accurate.

Checks

Verify the operating system uses internal system clocks to generate time stamps for audit records. If it does not, this is a finding.

Fix

Configure the operating system to use internal system clocks to generate time stamps for audit records.
V-56671 No Change
Findings ID: SRG-OS-000057-GPOS-00027 Rule ID: SV-70931r1_rule Severity: medium CCI: CCI-000162

Discussion

Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.

Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit operating system activity.

Checks

Verify the operating system protects audit information from unauthorized read access. If it does not, this is a finding.

Fix

Configure the operating system to protect audit information from unauthorized read access.
V-56673 No Change
Findings ID: SRG-OS-000058-GPOS-00028 Rule ID: SV-70933r1_rule Severity: medium CCI: CCI-000163

Discussion

If audit information were to become compromised, then forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve.

To ensure the veracity of audit information, the operating system must protect audit information from unauthorized modification.

Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit information system activity.

Checks

Verify the operating system protects audit information from unauthorized modification. If it does not, this is a finding.

Fix

Configure the operating system to protect audit information from unauthorized modification.
V-56675 No Change
Findings ID: SRG-OS-000059-GPOS-00029 Rule ID: SV-70935r1_rule Severity: medium CCI: CCI-000164

Discussion

If audit information were to become compromised, then forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve.

To ensure the veracity of audit information, the operating system must protect audit information from unauthorized deletion. This requirement can be achieved through multiple methods, which will depend upon system architecture and design.

Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit information system activity.

Checks

Verify the operating system protects audit information from unauthorized deletion. If it does not, this is a finding.

Fix

Configure the operating system to protect audit information from unauthorized deletion.
V-56677 No Change
Findings ID: SRG-OS-000062-GPOS-00031 Rule ID: SV-70937r1_rule Severity: medium CCI: CCI-000169

Discussion

Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

The list of audited events is the set of events for which audits are to be generated. This set of events is typically a subset of the list of all events for which the system is capable of generating audit records.

DoD has defined the list of events for which the operating system will provide an audit record generation capability as the following:

1) Successful and unsuccessful attempts to access, modify, or delete privileges, security objects, security levels, or categories of information (e.g., classification levels);

2) Access actions, such as successful and unsuccessful logon attempts, privileged activities or other system-level access, starting and ending time for user access to the system, concurrent logons from different workstations, successful and unsuccessful accesses to objects, all program initiations, and all direct access to the information system;

3) All account creations, modifications, disabling, and terminations; and

4) All kernel module load, unload, and restart actions.

Checks

Verify the operating system provides audit record generation capability for DoD-defined auditable events for all operating system components.

DoD has defined the list of events for which the operating system will provide an audit record generation capability as the following:

1) Successful and unsuccessful attempts to access, modify, or delete privileges, security objects, security levels, or categories of information (e.g., classification levels);

2) Access actions, such as successful and unsuccessful logon attempts, privileged activities or other system-level access, starting and ending time for user access to the system, concurrent logons from different workstations, successful and unsuccessful accesses to objects, all program initiations, and all direct access to the information system;

3) All account creations, modifications, disabling, and terminations; and

4) All kernel module load, unload, and restart actions.

If it does not, this is a finding.

Fix

Configure the operating system to provide audit record generation capability for DoD-defined auditable events for all operating system components.

DoD has defined the list of events for which the operating system will provide an audit record generation capability as the following:

1) Successful and unsuccessful attempts to access, modify, or delete privileges, security objects, security levels, or categories of information (e.g., classification levels);

2) Access actions, such as successful and unsuccessful logon attempts, privileged activities or other system-level access, starting and ending time for user access to the system, concurrent logons from different workstations, successful and unsuccessful accesses to objects, all program initiations, and all direct access to the information system;

3) All account creations, modifications, disabling, and terminations; and

4) All kernel module load, unload, and restart actions.
V-56679 No Change
Findings ID: SRG-OS-000063-GPOS-00032 Rule ID: SV-70939r1_rule Severity: medium CCI: CCI-000171

Discussion

Without the capability to restrict which roles and individuals can select which events are audited, unauthorized personnel may be able to prevent the auditing of critical events. Misconfigured audits may degrade the system's performance by overwhelming the audit log. Misconfigured audits may also make it more difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Checks

Verify the operating system allows only the ISSM (or individuals or roles appointed by the ISSM) to select which auditable events are to be audited. If it does not, this is a finding.

Fix

Configure the operating system to allow only the ISSM (or individuals or roles appointed by the ISSM) to select which auditable events are to be audited.
V-56681 No Change
Findings ID: SRG-OS-000064-GPOS-00033 Rule ID: SV-70941r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to access privileges occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to access privileges occur.
V-56683 No Change
Findings ID: SRG-OS-000066-GPOS-00034 Rule ID: SV-70943r1_rule Severity: medium CCI: CCI-000185

Discussion

Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate not already explicitly trusted.

A trust anchor is an authoritative entity represented via a public key and associated data. It is used in the context of public key infrastructures, X.509 digital certificates, and DNSSEC.

When there is a chain of trust, usually the top entity to be trusted becomes the trust anchor; it can be, for example, a Certification Authority (CA). A certification path starts with the subject certificate and proceeds through a number of intermediate certificates up to a trusted root certificate, typically issued by a trusted CA.

This requirement verifies that a certification path to an accepted trust anchor is used for certificate validation and that the path includes status information. Path validation is necessary for a relying party to make an informed trust decision when presented with any certificate not already explicitly trusted. Status information for certification paths includes certificate revocation lists or online certificate status protocol responses. Validation of the certificate status information is out of scope for this requirement.

Checks

Verify the operating system, for PKI-based authentication, validates certificates by constructing a certification path (which includes status information) to an accepted trust anchor. If it does not, this is a finding.

Fix

Configure the operating system, for PKI-based authentication, to validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.
V-56685 No Change
Findings ID: SRG-OS-000067-GPOS-00035 Rule ID: SV-70945r1_rule Severity: medium CCI: CCI-000186

Discussion

If the private key is discovered, an attacker can use the key to authenticate as an authorized user and gain access to the network infrastructure.

The cornerstone of the PKI is the private key used to encrypt or digitally sign information.

If the private key is stolen, this will lead to the compromise of the authentication and non-repudiation gained through PKI because the attacker can use the private key to digitally sign documents and pretend to be the authorized user.

Both the holders of a digital certificate and the issuing authority must protect the computers, storage devices, or whatever they use to keep the private keys.

Checks

Verify the operating system, for PKI-based authentication, enforces authorized access to the corresponding private key. If it does not, this is a finding.

Fix

Configure the operating system, for PKI-based authentication, to enforce authorized access to the corresponding private key.
V-56687 No Change
Findings ID: SRG-OS-000068-GPOS-00036 Rule ID: SV-70947r1_rule Severity: medium CCI: CCI-000187

Discussion

Without mapping the certificate used to authenticate to the user account, the ability to determine the identity of the individual user or group will not be available for forensic analysis.

Checks

Verify the operating system maps the authenticated identity to the user or group account for PKI-based authentication. If it does not, this is a finding.

Fix

Configure the operating system to map the authenticated identity to the user or group account for PKI-based authentication.
V-56689 No Change
Findings ID: SRG-OS-000069-GPOS-00037 Rule ID: SV-70949r1_rule Severity: medium CCI: CCI-000192

Discussion

Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.

Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Checks

Verify the operating system enforces password complexity by requiring that at least one upper-case character be used. If it does not, this is a finding.

Fix

Configure the operating system to enforce password complexity by requiring that at least one upper-case character be used.
V-56691 No Change
Findings ID: SRG-OS-000070-GPOS-00038 Rule ID: SV-70951r1_rule Severity: medium CCI: CCI-000193

Discussion

Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.

Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Checks

Verify the operating system enforces password complexity by requiring that at least one lower-case character be used. If it does not, this is a finding.

Fix

Configure the operating system to enforce password complexity by requiring that at least one lower-case character be used.
V-56693 No Change
Findings ID: SRG-OS-000071-GPOS-00039 Rule ID: SV-70953r1_rule Severity: medium CCI: CCI-000194

Discussion

Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.

Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Checks

Verify the operating system enforces password complexity by requiring that at least one numeric character be used. If it does not, this is a finding.

Fix

Configure the operating system to enforce password complexity by requiring that at least one numeric character be used.
V-56695 Updated
Findings ID: SRG-OS-000072-GPOS-00040 Rule ID: SV-70955r12_rule Severity: medium CCI: CCI-000195

Discussion

If the operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances of password compromise by increasing the window of opportunity for attempts at guessing and brute-force attacks.

The number of changed characters refers to the number of changes required with respect to the total number of positions in the current password. In other words, characters may be the same within the two passwords; however, the positions of the like characters must be different.


If the password length is an odd number then number of changed characters must be rounded up. For example, a password length of 15 characters must require the change of at least 8 characters.

Checks

Verify the operating system requires the change of at least eight of the total number of characters when passwords are changed. If it does not, this is a finding.

Fix

Configure the operating system to require the change of at least eight of the total number of characters when passwords are changed.
V-56697 No Change
Findings ID: SRG-OS-000073-GPOS-00041 Rule ID: SV-70957r1_rule Severity: medium CCI: CCI-000196

Discussion

Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised.

Checks

Verify the operating system stores only encrypted representations of passwords. If it does not, this is a finding.

Fix

Configure the operating system to store only encrypted representations of passwords.
V-56699 No Change
Findings ID: SRG-OS-000074-GPOS-00042 Rule ID: SV-70959r1_rule Severity: medium CCI: CCI-000197

Discussion

Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised.

Checks

Verify the operating system transmits only encrypted representations of passwords. If it does not, this is a finding.

Fix

Configure the operating system to transmit only encrypted representations of passwords.
V-56701 No Change
Findings ID: SRG-OS-000075-GPOS-00043 Rule ID: SV-70961r1_rule Severity: medium CCI: CCI-000198

Discussion

Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, then the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.

Checks

Verify operating system enforces 24 hours/1 day as the minimum password lifetime. If it does not, this is a finding.

Fix

Configure operating system to enforce 24 hours/1 day as the minimum password lifetime.
V-56703 No Change
Findings ID: SRG-OS-000076-GPOS-00044 Rule ID: SV-70963r1_rule Severity: medium CCI: CCI-000199

Discussion

Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.

Checks

Verify operating system enforces a 60-day maximum password lifetime restriction. If it does not, this is a finding.

Fix

Configure operating system to enforce a 60-day maximum password lifetime restriction.
V-56705 No Change
Findings ID: SRG-OS-000077-GPOS-00045 Rule ID: SV-70965r1_rule Severity: medium CCI: CCI-000200

Discussion

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.

Checks

Verify the operating system prohibits password reuse for a minimum of five generations. If it does not, this is a finding.

Fix

Configure the operating system to prohibit password reuse for a minimum of five generations.
V-56711 No Change
Findings ID: SRG-OS-000461-GPOS-00205 Rule ID: SV-70971r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to access categories of information (e.g., classification levels) occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to access categories of information (e.g., classification levels) occur.
V-56713 No Change
Findings ID: SRG-OS-000458-GPOS-00203 Rule ID: SV-70973r1_rule Severity: medium CCI: CCI-000172

Discussion

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Audit records can be generated from various components within the information system (e.g., module or policy filter).

Checks

Verify the operating system generates audit records when successful/unsuccessful attempts to access security objects occur. If it does not, this is a finding.

Fix

Configure the operating system to generate audit records when successful/unsuccessful attempts to access security objects occur.
V-56715 No Change
Findings ID: SRG-OS-000447-GPOS-00201 Rule ID: SV-70975r1_rule Severity: medium CCI: CCI-002702

Discussion

If anomalies are not acted upon, security functions may fail to secure the system.

Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.

Notifications provided by information systems include messages to local computer consoles, and/or hardware indications, such as lights.

This capability must take into account operational requirements for availability for selecting an appropriate response. The organization may choose to shut down or restart the information system upon security function anomaly detection.

Checks

Verify the operating system shuts down the information system, restarts the information system, and/or notifies the system administrator when anomalies in the operation of any security functions are discovered. If it does not, this is a finding.

Fix

Configure the operating system to shut down the information system, restart the information system, and/or notify the system administrator when anomalies in the operation of the security functions are discovered.
V-56717 No Change
Findings ID: SRG-OS-000446-GPOS-00200 Rule ID: SV-70977r1_rule Severity: medium CCI: CCI-002699

Discussion

Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.

Notifications provided by information systems include, for example, electronic alerts to system administrators, messages to local computer consoles, and/or hardware indications, such as lights.

This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.

Checks

Verify the operating system performs verification of the correct operation of security functions: upon system start-up and/or restart; upon command by a user with privileged access; and/or every 30 days. If it does not, this is a finding.

Fix

Configure the operating system to perform verification of the correct operation of security functions: upon system start-up and/or restart; upon command by a user with privileged access; and/or every 30 days.
V-56719 No Change
Findings ID: SRG-OS-000445-GPOS-00199 Rule ID: SV-70979r1_rule Severity: medium CCI: CCI-002696

Discussion

Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.

This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.

Checks

Verify the operating system verifies correct operation of all security functions. If it does not, this is a finding.

Fix

Configure the operating system to verify correct operation of all security functions.
V-56721 No Change
Findings ID: SRG-OS-000437-GPOS-00194 Rule ID: SV-70981r1_rule Severity: medium CCI: CCI-002617

Discussion

Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.

Checks

Verify the operating system removes all software components after updated versions have been installed. If it does not, this is a finding.

Fix

Configure the operating system to remove all software components after updated versions have been installed.
V-56723 No Change
Findings ID: SRG-OS-000433-GPOS-00193 Rule ID: SV-70983r1_rule Severity: medium CCI: CCI-002824

Discussion

Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory include, for example, data execution prevention and address space layout randomization. Data execution prevention safeguards can either be hardware-enforced or software-enforced with hardware providing the greater strength of mechanism.

Examples of attacks are buffer overflow attacks.

Checks

Verify the operating system implements address space layout randomization to protect its memory from unauthorized code execution. If it does not, this is a finding.

Fix

Configure the operating system to implement address space layout randomization to protect its memory from unauthorized code execution.
V-56725 No Change
Findings ID: SRG-OS-000433-GPOS-00192 Rule ID: SV-70985r1_rule Severity: medium CCI: CCI-002824

Discussion

Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory include, for example, data execution prevention and address space layout randomization. Data execution prevention safeguards can either be hardware-enforced or software-enforced with hardware providing the greater strength of mechanism.

Examples of attacks are buffer overflow attacks.

Checks

Verify the operating system implements non-executable data to protect its memory from unauthorized code execution. If it does not, this is a finding.

Fix

Configure the operating system to implement non-executable data to protect its memory from unauthorized code execution.
V-56727 No Change
Findings ID: SRG-OS-000432-GPOS-00191 Rule ID: SV-70987r1_rule Severity: medium CCI: CCI-002754

Discussion

A common vulnerability of operating system is unpredictable behavior when invalid inputs are received. This requirement guards against adverse or unintended system behavior caused by invalid inputs, where information system responses to the invalid input may be disruptive or cause the system to fail into an unsafe state.

The behavior will be derived from the organizational and system requirements and includes, but is not limited to, notification of the appropriate personnel, creating an audit record, and rejecting invalid input.

Checks

Verify the operating system behaves in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received. If it does not, this is a finding.

Fix

Configure the operating system to behave in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received.
V-56729 No Change
Findings ID: SRG-OS-000426-GPOS-00190 Rule ID: SV-70989r1_rule Severity: medium CCI: CCI-002422

Discussion

Information can be either unintentionally or maliciously disclosed or modified during reception, including, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information.

Ensuring the confidentiality of transmitted information requires the operating system to take measures in preparing information for transmission. This can be accomplished via access control and encryption.

Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When receiving data, operating systems need to leverage protection mechanisms such as TLS, SSL VPNs, or IPSec.

Checks

Verify the operating system maintains the confidentiality and integrity of information during reception. If it does not, this is a finding.

Fix

Configure the operating system to maintain the confidentiality and integrity of information during reception.
V-56731 No Change
Findings ID: SRG-OS-000425-GPOS-00189 Rule ID: SV-70991r1_rule Severity: medium CCI: CCI-002420

Discussion

Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information.

Ensuring the confidentiality of transmitted information requires the operating system to take measures in preparing information for transmission. This can be accomplished via access control and encryption.

Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When transmitting data, operating systems need to support transmission protection mechanisms such as TLS, SSL VPNs, or IPSec.

Checks

Verify the operating system maintains the confidentiality and integrity of information during preparation for transmission. If it does not, this is a finding.

Fix

Configure the operating system to maintain the confidentiality and integrity of information during preparation for transmission.
V-56733 No Change
Findings ID: SRG-OS-000424-GPOS-00188 Rule ID: SV-70993r1_rule Severity: medium CCI: CCI-002421

Discussion

Encrypting information for transmission protects information from unauthorized disclosure and modification. Cryptographic mechanisms implemented to protect information integrity include, for example, cryptographic hash functions which have common application in digital signatures, checksums, and message authentication codes.

Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When transmitting data, operating systems need to leverage transmission protection mechanisms such as TLS, SSL VPNs, or IPSec.

Alternative physical protection measures include PDS. PDSs are used to transmit unencrypted classified National Security Information (NSI) through an area of lesser classification or control. Since the classified NSI is unencrypted, the PDS must provide adequate electrical, electromagnetic, and physical safeguards to deter exploitation.

Checks

Verify the operating system implements cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a Protected Distribution System (PDS). If it does not, this is a finding.

Fix

Configure the operating system to implement cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a Protected Distribution System (PDS).
V-56735 No Change
Findings ID: SRG-OS-000423-GPOS-00187 Rule ID: SV-70995r1_rule Severity: medium CCI: CCI-002418

Discussion

Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered.

This requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification.

Protecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa.

Checks

Verify the operating system protects the confidentiality and integrity of transmitted information. If it does not, this is a finding.

Fix

Configure the operating system to protect the confidentiality and integrity of transmitted information.
V-56737 No Change
Findings ID: SRG-OS-000420-GPOS-00186 Rule ID: SV-70997r1_rule Severity: medium CCI: CCI-002385

Discussion

DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.

This requirement addresses the configuration of the operating system to mitigate the impact of DoS attacks that have occurred or are ongoing on system availability. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.

Checks

Verify the operating system protects against or limits the effects of Denial of Service (DoS) attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces. If it does not, this is a finding.

Fix

Configure the operating system to protect against or limit the effects of Denial of Service (DoS) attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces.
V-56739 No Change
Findings ID: SRG-OS-000405-GPOS-00184 Rule ID: SV-70999r1_rule Severity: medium CCI: CCI-002476

Discussion

Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.

Selection of a cryptographic mechanism is based on the need to protect the integrity of organizational information. The strength of the mechanism is commensurate with the security category and/or classification of the information. Organizations have the flexibility to either encrypt all information on storage devices (i.e., full disk encryption) or encrypt specific data structures (e.g., files, records, or fields).

Checks

Verify the operating system implements cryptographic mechanisms to prevent unauthorized disclosure of all information at rest on all operating system components. If it does not, this is a finding.

Fix

Configure the operating system to implement cryptographic mechanisms to prevent unauthorized disclosure of all information at rest on all operating system components.
V-56741 No Change
Findings ID: SRG-OS-000404-GPOS-00183 Rule ID: SV-71001r1_rule Severity: medium CCI: CCI-002475

Discussion

Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.

Selection of a cryptographic mechanism is based on the need to protect the integrity of organizational information. The strength of the mechanism is commensurate with the security category and/or classification of the information. Organizations have the flexibility to either encrypt all information on storage devices (i.e., full disk encryption) or encrypt specific data structures (e.g., files, records, or fields).

Checks

Verify the operating system implements cryptographic mechanisms to prevent unauthorized modification of all information at rest on all operating system components. If it does not, this is a finding.

Fix

Configure the operating system to implement cryptographic mechanisms to prevent unauthorized modification of all information at rest on all operating system components.
V-56743 No Change
Findings ID: SRG-OS-000078-GPOS-00046 Rule ID: SV-71003r1_rule Severity: medium CCI: CCI-000205

Discussion

The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised.

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. Use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.

Checks

Verify the operating system enforces a minimum 15-character password length. If it does not, this is a finding.

Fix

Configure the operating system to enforce a minimum 15-character password length.
V-56745 No Change
Findings ID: SRG-OS-000079-GPOS-00047 Rule ID: SV-71005r1_rule Severity: medium CCI: CCI-000206

Discussion

To prevent the compromise of authentication information, such as passwords during the authentication process, the feedback from the operating system shall not provide any information allowing an unauthorized user to compromise the authentication mechanism.

Obfuscation of user-provided information that is typed into the system is a method used when addressing this risk.

For example, displaying asterisks when a user types in a password is an example of obscuring feedback of authentication information.

Checks

Verify the operating system obscures feedback of authentication information during the authentication process to protect the information from possible exploitation/use by unauthorized individuals. If it does not, this is a finding.

Fix

Configure the operating system to obscure feedback of authentication information during the authentication process to protect the information from possible exploitation/use by unauthorized individuals.
V-56747 No Change
Findings ID: SRG-OS-000080-GPOS-00048 Rule ID: SV-71007r1_rule Severity: medium CCI: CCI-000213

Discussion

To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must be properly configured to incorporate access control methods that do not rely solely on the possession of a certificate for access. Successful authentication must not automatically give an entity access to an asset or security boundary. Authorization procedures and controls must be implemented to ensure each authenticated entity also has a validated and current authorization. Authorization is the process of determining whether an entity, once authenticated, is permitted to access a specific asset. Information systems use access control policies and enforcement mechanisms to implement this requirement.

Access control policies include: identity-based policies, role-based policies, and attribute-based policies. Access enforcement mechanisms include: access control lists, access control matrices, and cryptography. These policies and mechanisms must be employed by the application to control access between users (or processes acting on behalf of users) and objects (e.g., devices, files, records, processes, programs, and domains) in the information system.

Checks

Verify the operating system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies. If it does not, this is a finding.

Fix

Configure the operating system to enforce approved authorizations for logical access to information and system resources in accordance with applicable access control policies.
V-56749 No Change
Findings ID: SRG-OS-000095-GPOS-00049 Rule ID: SV-71009r1_rule Severity: medium CCI: CCI-000381

Discussion

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors.

Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions).

Examples of non-essential capabilities include, but are not limited to, games, software packages, tools, and demonstration software, not related to requirements or providing a wide array of functionality not required for every mission, but which cannot be disabled.

Checks

Verify the operating system is configured to disable non-essential capabilities. If it does not, this is a finding.

Fix

Configure the operating system to disable non-essential capabilities.
V-56751 No Change
Findings ID: SRG-OS-000096-GPOS-00050 Rule ID: SV-71011r1_rule Severity: medium CCI: CCI-000382

Discussion

In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems.

Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component.

To support the requirements and principles of least functionality, the operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues.

Checks

Verify the operating system is configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments. If it does not, this is a finding.

Fix

Configure the operating system to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.
V-56753 No Change
Findings ID: SRG-OS-000104-GPOS-00051 Rule ID: SV-71013r1_rule Severity: medium CCI: CCI-000764

Discussion

To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system.

Organizational users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Organizational users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following:

1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; and

2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity.

Checks

Verify the operating system uniquely identifies and authenticates organizational users (or processes acting on behalf of organizational users). If it does not, this is a finding.

Fix

Configure the operating system to uniquely identify and authenticate organizational users (or processes acting on behalf of organizational users).
V-56755 No Change
Findings ID: SRG-OS-000105-GPOS-00052 Rule ID: SV-71015r1_rule Severity: medium CCI: CCI-000765

Discussion

Without the use of multifactor authentication, the ease of access to privileged functions is greatly increased.

Multifactor authentication requires using two or more factors to achieve authentication.

Factors include:
1) something a user knows (e.g., password/PIN);
2) something a user has (e.g., cryptographic identification device, token); and
3) something a user is (e.g., biometric).

A privileged account is defined as an information system account with authorizations of a privileged user.

Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., local area network, wide area network, or the Internet).

The DoD CAC with DoD-approved PKI is an example of multifactor authentication.

Checks

Verify the operating system uses multifactor authentication for network access to privileged accounts. If it does not, this is a finding.

Fix

Configure the operating system to use multifactor authentication for network access to privileged accounts.
V-56757 No Change
Findings ID: SRG-OS-000106-GPOS-00053 Rule ID: SV-71017r1_rule Severity: medium CCI: CCI-000766

Discussion

To assure accountability and prevent unauthenticated access, non-privileged users must utilize multifactor authentication to prevent potential misuse and compromise of the system.

Multifactor authentication uses two or more factors to achieve authentication.

Factors include:
1) Something you know (e.g., password/PIN);
2) Something you have (e.g., cryptographic identification device, token); and
3) Something you are (e.g., biometric).

A non-privileged account is any information system account with authorizations of a non-privileged user.

Network access is any access to an application by a user (or process acting on behalf of a user) where said access is obtained through a network connection.

The DoD CAC with DoD-approved PKI is an example of multifactor authentication.

Checks

Verify the operating system uses multifactor authentication for network access to non-privileged accounts. If it does not, this is a finding.

Fix

Configure the operating system to use multifactor authentication for network access to non-privileged accounts.
V-56759 No Change
Findings ID: SRG-OS-000107-GPOS-00054 Rule ID: SV-71019r1_rule Severity: medium CCI: CCI-000767

Discussion

To assure accountability and prevent unauthenticated access, privileged users must utilize multifactor authentication to prevent potential misuse and compromise of the system.

Multifactor authentication is defined as using two or more factors to achieve authentication.

Factors include:
1) Something you know (e.g., password/PIN);
2) Something you have (e.g., cryptographic identification device, token); and
3) Something you are (e.g., biometric).

A privileged account is defined as an operating system account with authorizations of a privileged user.

Local access is defined as access to an organizational information system by a user (or process acting on behalf of a user) communicating through a direct connection without the use of a network.

The DoD CAC with DoD-approved PKI is an example of multifactor authentication.

Checks

Verify the operating system uses multifactor authentication for local access to privileged accounts. If it does not, this is a finding.

Fix

Configure the operating system to use multifactor authentication for local access to privileged accounts.
V-56761 No Change
Findings ID: SRG-OS-000108-GPOS-00055 Rule ID: SV-71021r1_rule Severity: medium CCI: CCI-000768

Discussion

To assure accountability, prevent unauthenticated access, and prevent misuse of the system, non-privileged users must utilize multifactor authentication for local access.

Multifactor authentication is defined as using two or more factors to achieve authentication.

Factors include:
1) Something you know (e.g., password/PIN);
2) Something you have (e.g., cryptographic identification device or token); and
3) Something you are (e.g., biometric).

A non-privileged account is defined as an operating system account with authorizations of a regular or non-privileged user.

Local access is defined as access to an organizational information system by a user (or process acting on behalf of a user) communicating through a direct connection without the use of a network.

The DoD CAC with DoD-approved PKI is an example of multifactor authentication.

Checks

Verify the operating system uses multifactor authentication for local access to non-privileged accounts. If it does not, this is a finding.

Fix

Configure the operating system to use multifactor authentication for local access to non-privileged accounts.
V-56763 No Change
Findings ID: SRG-OS-000109-GPOS-00056 Rule ID: SV-71023r1_rule Severity: medium CCI: CCI-000770

Discussion

To assure individual accountability and prevent unauthorized access, organizational users must be individually identified and authenticated.

A group authenticator is a generic account used by multiple individuals. Use of a group authenticator alone does not uniquely identify individual users. Examples of the group authenticator is the UNIX OS "root" user account, the Windows "Administrator" account, the "sa" account, or a "helpdesk" account.

For example, the UNIX and Windows operating systems offer a 'switch user' capability allowing users to authenticate with their individual credentials and, when needed, 'switch' to the administrator role. This method provides for unique individual authentication prior to using a group authenticator.

Users (and any processes acting on behalf of users) need to be uniquely identified and authenticated for all accesses other than those accesses explicitly identified and documented by the organization, which outlines specific user actions that can be performed on the operating system without identification or authentication.

Requiring individuals to be authenticated with an individual authenticator prior to using a group authenticator allows for traceability of actions, as well as adding an additional level of protection of the actions that can be taken with group account knowledge.

Checks

Verify the operating system requires individuals to be authenticated with an individual authenticator prior to using a group authenticator. If it does not, this is a finding.

Fix

Configure the operating system to require individuals to be authenticated with an individual authenticator prior to using a group authenticator.
V-56765 No Change
Findings ID: SRG-OS-000112-GPOS-00057 Rule ID: SV-71025r1_rule Severity: medium CCI: CCI-001941

Discussion

A replay attack may enable an unauthorized user to gain access to the operating system. Authentication sessions between the authenticator and the operating system validating the user credentials must not be vulnerable to a replay attack.

An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message.

A privileged account is any information system account with authorizations of a privileged user.

Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

Checks

Verify the operating system implements replay-resistant authentication mechanisms for network access to privileged accounts. If it does not, this is a finding.

Fix

Configure the operating system to implement replay-resistant authentication mechanisms for network access to privileged accounts.
V-56767 No Change
Findings ID: SRG-OS-000113-GPOS-00058 Rule ID: SV-71027r1_rule Severity: medium CCI: CCI-001942

Discussion

A replay attack may enable an unauthorized user to gain access to the operating system. Authentication sessions between the authenticator and the operating system validating the user credentials must not be vulnerable to a replay attack.

An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message.

A non-privileged account is any operating system account with authorizations of a non-privileged user.

Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

Checks

Verify the operating system implements replay-resistant authentication mechanisms for network access to non-privileged accounts. If it does not, this is a finding.

Fix

Configure the operating system to implement replay-resistant authentication mechanisms for network access to non-privileged accounts.
V-56769 No Change
Findings ID: SRG-OS-000114-GPOS-00059 Rule ID: SV-71029r1_rule Severity: medium CCI: CCI-000778

Discussion

Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity.

Peripherals include, but are not limited to, such devices as flash drives, external storage, and printers.

Checks

Verify the operating system uniquely identifies peripherals before establishing a connection. If it does not, this is a finding.

Fix

Configure the operating system to uniquely identify peripherals before establishing a connection.
V-56771 No Change
Findings ID: SRG-OS-000118-GPOS-00060 Rule ID: SV-71031r1_rule Severity: medium CCI: CCI-000795

Discussion

Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained.

Operating systems need to track periods of inactivity and disable application identifiers after 35 days of inactivity.

Checks

Verify the operating system disables account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity. If it does not, this is a finding.

Fix

Configure the operating system to disable account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity.
V-56773 No Change
Findings ID: SRG-OS-000403-GPOS-00182 Rule ID: SV-71033r1_rule Severity: medium CCI: CCI-002470

Discussion

Untrusted Certificate Authorities (CA) can issue certificates, but they may be issued by organizations or individuals that seek to compromise DoD systems or by organizations with insufficient security controls. If the CA used for verifying the certificate is not a DoD-approved CA, trust of this CA has not been established.

The DoD will only accept PKI-certificates obtained from a DoD-approved internal or external certificate authority. Reliance on CAs for the establishment of secure sessions includes, for example, the use of SSL/TLS certificates.

Checks

Verify the operating system only allows the use of DoD PKI-established certificate authorities for verification of the establishment of protected sessions. If it does not, this is a finding.

Fix

Configure the operating system to only allow the use of DoD PKI-established certificate authorities for verification of the establishment of protected sessions.
V-56775 No Change
Findings ID: SRG-OS-000402-GPOS-00181 Rule ID: SV-71035r1_rule Severity: medium CCI: CCI-002468

Discussion

If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data origin authentication verification must be performed to thwart these types of attacks.

Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations.

This is not applicable if DNSSEC is not implemented on the local network.

Checks

Verify the operating system performs data origin verification authentication on the name/address resolution responses the system receives from authoritative sources. If it does not, this is a finding.

Fix

Configure the operating system to perform data origin verification authentication on the name/address resolution responses the system receives from authoritative sources.
V-56777 No Change
Findings ID: SRG-OS-000401-GPOS-00180 Rule ID: SV-71037r1_rule Severity: medium CCI: CCI-002467

Discussion

If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data integrity verification must be performed to thwart these types of attacks.

Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations.

This is not applicable if DNSSEC is not implemented on the local network.

Checks

Verify the operating system performs data integrity verification on the name/address resolution responses the system receives from authoritative sources. If it does not, this is a finding.

Fix

Configure the operating system to perform data integrity verification on the name/address resolution responses the system receives from authoritative sources.
V-56779 No Change
Findings ID: SRG-OS-000400-GPOS-00179 Rule ID: SV-71039r1_rule Severity: medium CCI: CCI-002466

Discussion

If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data integrity verification must be performed to thwart these types of attacks.

Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations.

This is not applicable if DNSSEC is not implemented on the local network.

Checks

Verify the operating system requests data integrity verification on the name/address resolution responses the system receives from authoritative sources. If it does not, this is a finding.

Fix

Configure the operating system to request data integrity verification on the name/address resolution responses the system receives from authoritative sources.
V-56781 No Change
Findings ID: SRG-OS-000399-GPOS-00178 Rule ID: SV-71041r1_rule Severity: medium CCI: CCI-002465

Discussion

If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed, which would result in query failure or DoS. Data origin authentication must be performed to thwart these types of attacks.

Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. Information systems that use technologies other than the DNS to map between host/service names and network addresses provide other means to enable clients to verify the authenticity of response data.

This is not applicable if DNSSEC is not implemented on the local network.

Checks

Verify the operating system requests data origin authentication verification on the name/address resolution responses the system receives from authoritative sources. If it does not, this is a finding.

Fix

Configure the operating system to request data origin authentication verification on the name/address resolution responses the system receives from authoritative sources.
V-56783 No Change
Findings ID: SRG-OS-000396-GPOS-00176 Rule ID: SV-71043r1_rule Severity: medium CCI: CCI-002450

Discussion

Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated.

Checks

Verify the operating system implements NSA-approved cryptography to protect classified information in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards. If it does not, this is a finding.

Fix

Configure the operating system to implement NSA-approved cryptography to protect classified information in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.
V-56785 No Change
Findings ID: SRG-OS-000120-GPOS-00061 Rule ID: SV-71045r1_rule Severity: medium CCI: CCI-000803

Discussion

Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised.

Operating systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules.

FIPS 140-2 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DoD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general purpose computing system.

Checks

Verify the operating system uses mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module. If it does not, this is a finding.

Fix

Configure the operating system to use mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module.
V-56787 No Change
Findings ID: SRG-OS-000395-GPOS-00175 Rule ID: SV-71047r1_rule Severity: medium CCI: CCI-002891

Discussion

If the remote connection is not closed and verified as closed, the session may remain open and be exploited by an attacker; this is referred to as a zombie session. Remote connections must be disconnected and verified as disconnected when nonlocal maintenance sessions have been terminated and are no longer available for use.

Checks

Verify the operating system verifies remote disconnection at the termination of nonlocal maintenance and diagnostic sessions, when used for nonlocal maintenance sessions. If it does not, this is a finding.

Fix

Configure the operating system to verify remote disconnection at the termination of nonlocal maintenance and diagnostic sessions, when used for nonlocal maintenance sessions.
V-56789 No Change
Findings ID: SRG-OS-000394-GPOS-00174 Rule ID: SV-71049r1_rule Severity: medium CCI: CCI-003123

Discussion

Privileged access contains control and configuration information and is particularly sensitive, so additional protections are necessary. This is maintained by using cryptographic mechanisms such as encryption to protect confidentiality.

Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection.

This requirement applies to hardware/software diagnostic test equipment or tools. This requirement does not cover hardware/software components that may support information system maintenance, yet are a part of the system (e.g., the software implementing "ping," "ls," "ipconfig," or the hardware and software implementing the monitoring port of an Ethernet switch).

The operating system can meet this requirement through leveraging a cryptographic module.

Checks

Verify the operating system implements cryptographic mechanisms to protect the confidentiality of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions. If it does not, this is a finding.

Fix

Configure the operating system to implement cryptographic mechanisms to protect the confidentiality of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.
V-56791 No Change
Findings ID: SRG-OS-000121-GPOS-00062 Rule ID: SV-71051r1_rule Severity: medium CCI: CCI-000804

Discussion

Lack of authentication and identification enables non-organizational users to gain access to the application or possibly other information systems and provides an opportunity for intruders to compromise resources within the application or information system.

Non-organizational users include all information system users other than organizational users, which include organizational employees or individuals the organization deems to have equivalent status of an employee (e.g., contractors and guest researchers).

Non-organizational users shall be uniquely identified and authenticated for all accesses other than those accesses explicitly identified and documented by the organization when related to the use of anonymous access.

Checks

Verify the operating system uniquely identifies and authenticates non-organizational users (or processes acting on behalf of non-organizational users). If it does not, this is a finding.

Fix

Configure the operating system to uniquely identify and authenticate non-organizational users (or processes acting on behalf of non-organizational users).
V-56793 No Change
Findings ID: SRG-OS-000393-GPOS-00173 Rule ID: SV-71053r1_rule Severity: medium CCI: CCI-002890

Discussion

Privileged access contains control and configuration information and is particularly sensitive, so additional protections are necessary. This is maintained by using cryptographic mechanisms, such as a hash function or digital signature, to protect integrity.

Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection.

The operating system can meet this requirement through leveraging a cryptographic module. This requirement does not cover hardware/software components that may support information system maintenance, yet are a part of the system (e.g., the software implementing "ping," "ls," "ipconfig," or the hardware and software implementing the monitoring port of an Ethernet switch).

Checks

Verify the operating system implements cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions. If it does not, this is a finding.

Fix

Configure the operating system to implement cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.
V-56795 No Change
Findings ID: SRG-OS-000392-GPOS-00172 Rule ID: SV-71055r1_rule Severity: medium CCI: CCI-002884

Discussion

If events associated with nonlocal administrative access or diagnostic sessions are not logged, a major tool for assessing and investigating attacks would not be available.

This requirement addresses auditing-related issues associated with maintenance tools used specifically for diagnostic and repair actions on organizational information systems.

Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection.

This requirement applies to hardware/software diagnostic test equipment or tools. This requirement does not cover hardware/software components that may support information system maintenance, yet are a part of the system, for example, the software implementing "ping," "ls," "ipconfig," or the hardware and software implementing the monitoring port of an Ethernet switch.

Checks

Verify the operating system audits all activities performed during nonlocal maintenance and diagnostic sessions. If it does not, this is a finding.

Fix

Configure the operating system to audit all activities performed during nonlocal maintenance and diagnostic sessions.
V-56797 No Change
Findings ID: SRG-OS-000384-GPOS-00167 Rule ID: SV-71057r1_rule Severity: medium CCI: CCI-001991

Discussion

Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer authorized (users with revoked certificates).

Checks

Verify the operating system, for PKI-based authentication, implements a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network. If it does not, this is a finding.

Fix

Configure the operating system, for PKI-based authentication, to implement a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network.
V-56799 No Change
Findings ID: SRG-OS-000122-GPOS-00063 Rule ID: SV-71059r1_rule Severity: medium CCI: CCI-001876

Discussion

The ability to generate on-demand reports, including after the audit data has been subjected to audit reduction, greatly facilitates the organization's ability to generate incident reports as needed to better handle larger-scale or more complex security incidents.

Audit reduction is a process that manipulates collected audit information and organizes such information in a summary format that is more meaningful to analysts. The report generation capability provided by the application must support on-demand (i.e., customizable, ad hoc, and as-needed) reports.

Checks

Verify the operating system provides an audit reduction capability that supports on-demand reporting requirements. If it does not, this is a finding.

Fix

Configure the operating system to provide an audit reduction capability that supports on-demand reporting requirements.
V-56801 No Change
Findings ID: SRG-OS-000383-GPOS-00166 Rule ID: SV-71061r1_rule Severity: medium CCI: CCI-002007

Discussion

If cached authentication information is out-of-date, the validity of the authentication information may be questionable.

Checks

Verify the operating system prohibits the use of cached authenticators after one day. If it does not, this is a finding.

Fix

Configure the operating system to prohibit the use of cached authenticators after one day.
V-56803 No Change
Findings ID: SRG-OS-000380-GPOS-00165 Rule ID: SV-71063r1_rule Severity: medium CCI: CCI-002041

Discussion

Without providing this capability, an account may be created without a password. Non-repudiation cannot be guaranteed once an account is created if a user is not forced to change the temporary password upon initial logon.

Temporary passwords are typically used to allow access when new accounts are created or passwords are changed. It is common practice for administrators to create temporary passwords for user accounts which allow the users to log on, yet force them to change the password once they have successfully authenticated.

Checks

Verify the operating system allows the use of a temporary password for system logons with an immediate change to a permanent password. If it does not, this is a finding.

Fix

Configure the operating system to allow the use of a temporary password for system logons with an immediate change to a permanent password.
V-56805 Updated
Findings ID: SRG-OS-000123-GPOS-00064 Rule ID: SV-71065r13_rule Severity: medium CCI: CCI-001682

Discussion

Emergency administrator accounts are privileged accounts whichthat are established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability.

Emergency
administrator accounts are different from infrequently used accounts (i.e., local logon accounts used by the organization's system administrators when network or normal logon/access is not available). Infrequently used accounts also remain available and are not subject to automatic termination dates. However, an emergency administrator account is normally a different account which is created for use by vendors or sys Emergency accounts are accounts created in response to crisis situations, usually for use by maintenance personnel. The automatic expiration or disabling time period may be extended as needed until the crisis is resolved; however, it must not be extended indefinitely. A permanent account should be established for privileged users who need long-term maintainerenance accounts.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system is configured such that emergency administrator accounts are never automatically removed or disabled within 72 hours. If it is not, this is a finding.

Fix

Configure the operating system such that emergency administrator accounts are never automatically removed or disabled within 72 hours.
V-56807 No Change
Findings ID: SRG-OS-000379-GPOS-00164 Rule ID: SV-71067r1_rule Severity: medium CCI: CCI-001967

Discussion

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk.

Bidirectional authentication solutions include, but are not limited to, IEEE 802.1x and Extensible Authentication Protocol [EAP], RADIUS server with EAP-Transport Layer Security [TLS] authentication, Kerberos, and SSL mutual authentication.

A local connection is any connection with a device communicating without the use of a network. A network connection is any connection with a device that communicates through a network (e.g., local area network, wide area network, or the Internet). A remote connection is any connection with a device communicating through an external network (e.g., the Internet).

Because of the challenges of applying this requirement on a large scale, organizations are encouraged to only apply this requirement to those limited number (and type) of devices that truly need to support this capability.

Checks

Verify the operating system authenticates all endpoint devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based. If it does not, this is a finding.

Fix

Configure the operating system to authenticate all endpoint devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.
V-56809 No Change
Findings ID: SRG-OS-000378-GPOS-00163 Rule ID: SV-71069r1_rule Severity: medium CCI: CCI-001958

Discussion

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity.

Peripherals include, but are not limited to, such devices as flash drives, external storage, and printers.

Checks

Verify the operating system authenticates peripherals before establishing a connection. If it does not, this is a finding.

Fix

Configure the operating system to authenticate peripherals before establishing a connection.
V-56811 No Change
Findings ID: SRG-OS-000125-GPOS-00065 Rule ID: SV-71071r1_rule Severity: medium CCI: CCI-000877

Discussion

If maintenance tools are used by unauthorized personnel, they may accidentally or intentionally damage or compromise the system. The act of managing systems and applications includes the ability to access sensitive application information, such as system configuration details, diagnostic information, user information, and potentially sensitive application data.

Some maintenance and test tools are either standalone devices with their own operating systems or are applications bundled with an operating system.

Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection. Typically, strong authentication requires authenticators that are resistant to replay attacks and employ multifactor authentication. Strong authenticators include, for example, PKI where certificates are stored on a token protected by a password, passphrase, or biometric.

Checks

Verify the operating system employs strong authenticators in the establishment of nonlocal maintenance and diagnostic sessions. If it does not, this is a finding.

Fix

Configure the operating system to employ strong authenticators in the establishment of nonlocal maintenance and diagnostic sessions.
V-56813 No Change
Findings ID: SRG-OS-000377-GPOS-00162 Rule ID: SV-71073r1_rule Severity: medium CCI: CCI-001954

Discussion

The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access.

DoD has mandated the use of the CAC to support identity management and personal authentication for systems covered under Homeland Security Presidential Directive (HSPD) 12, as well as making the CAC a primary component of layered protection for national security systems.

Checks

Verify the operating system electronically verifies Personal Identity Verification (PIV) credentials. If it does not, this is a finding.

Fix

Configure the operating system to electronically verify Personal Identity Verification (PIV) credentials.
V-56815 No Change
Findings ID: SRG-OS-000376-GPOS-00161 Rule ID: SV-71075r1_rule Severity: medium CCI: CCI-001953

Discussion

The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access.

DoD has mandated the use of the CAC to support identity management and personal authentication for systems covered under Homeland Security Presidential Directive (HSPD) 12, as well as making the CAC a primary component of layered protection for national security systems.

Checks

Verify the operating system accepts Personal Identity Verification (PIV) credentials. If it does not, this is a finding.

Fix

Configure the operating system to accept Personal Identity Verification (PIV) credentials.
V-56817 No Change
Findings ID: SRG-OS-000375-GPOS-00160 Rule ID: SV-71077r1_rule Severity: medium CCI: CCI-001948

Discussion

Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device.

Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card.

A privileged account is defined as an information system account with authorizations of a privileged user.

Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.

This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management).

Requires further clarification from NIST.

Checks

Verify the operating system implements multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access. If it does not, this is a finding.

Fix

Configure the operating system to implement multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access.
V-56823 No Change
Findings ID: SRG-OS-000374-GPOS-00159 Rule ID: SV-71083r1_rule Severity: medium CCI: CCI-002039

Discussion

Without re-authentication, devices may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to change device authenticators, it is critical the device re-authenticate.

Checks

Verify the operating system requires devices to re-authenticate when changing authenticators. If it does not, this is a finding.

Fix

Configure the operating system to require devices to re-authenticate when changing authenticators.
V-56827 No Change
Findings ID: SRG-OS-000373-GPOS-00158 Rule ID: SV-71087r1_rule Severity: medium CCI: CCI-002038

Discussion

Without re-authentication, users may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to change user authenticators, it is critical the user re-authenticate.

Checks

Verify the operating system requires users to re-authenticate when changing authenticators. If it does not, this is a finding.

Fix

Configure the operating system to require users to re-authenticate when changing authenticators.
V-56829 No Change
Findings ID: SRG-OS-000126-GPOS-00066 Rule ID: SV-71089r1_rule Severity: medium CCI: CCI-000879

Discussion

If a maintenance session or connection remains open after maintenance is completed, it may be hijacked by an attacker and used to compromise or damage the system.

Some maintenance and test tools are either standalone devices with their own operating systems or are applications bundled with an operating system.

Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection.

Checks

Verify the operating system terminates all sessions and network connections related to nonlocal maintenance when nonlocal maintenance is completed. If it does not, this is a finding.

Fix

Configure the operating system to terminate all sessions and network connections related to nonlocal maintenance when nonlocal maintenance is completed.
V-56831 No Change
Findings ID: SRG-OS-000373-GPOS-00157 Rule ID: SV-71091r1_rule Severity: medium CCI: CCI-002038

Discussion

Without re-authentication, users may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to change security roles, it is critical the user re-authenticate.

Checks

Verify the operating system requires users to re-authenticate when changing roles. If it does not, this is a finding.

Fix

Configure the operating system to require users to re-authenticate when changing roles.
V-56835 No Change
Findings ID: SRG-OS-000132-GPOS-00067 Rule ID: SV-71095r1_rule Severity: medium CCI: CCI-001082

Discussion

Operating system management functionality includes functions necessary for administration and requires privileged user access. Allowing non-privileged users to access operating system management functionality capabilities increases the risk that non-privileged users may obtain elevated privileges.

Operating system management functionality includes functions necessary to administer console, network components, workstations, or servers and typically requires privileged user access.

The separation of user functionality from information system management functionality is either physical or logical and is accomplished by using different computers, different central processing units, different instances of the operating system, different network addresses, different TCP/UDP ports, virtualization techniques, combinations of these methods, or other methods, as appropriate.

An example of this type of separation is observed in web administrative interfaces that use separate authentication methods for users of any other information system resources. This may include isolating the administrative interface on a different security domain and with additional access controls.

Checks

Verify the operating system separates user functionality (including user interface services) from operating system management functionality. If it does not, this is a finding.

Fix

Configure the operating system to separate user functionality (including user interface services) from operating system management functionality.
V-56837 No Change
Findings ID: SRG-OS-000373-GPOS-00156 Rule ID: SV-71097r1_rule Severity: medium CCI: CCI-002038

Discussion

Without re-authentication, users may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate.

Checks

Verify the operating system requires users to re-authenticate for privilege escalation. If it does not, this is a finding.

Fix

Configure the operating system to require users to re-authenticate for privilege escalation.
V-56841 No Change
Findings ID: SRG-OS-000370-GPOS-00155 Rule ID: SV-71101r2_rule Severity: medium CCI: CCI-001774

Discussion

Utilizing a whitelist provides a configuration management method for allowing the execution of only authorized software. Using only authorized software decreases risk by limiting the number of potential vulnerabilities.

The organization must identify authorized software programs and permit execution of authorized software. The process used to identify software programs that are authorized to execute on organizational information systems is commonly referred to as whitelisting.

Verification of white-listed software occurs prior to execution or at system startup.

This requirement applies to operating system programs, functions, and services designed to manage system processes and configurations (e.g., group policies).

Checks

Verify the operating system employs a deny-all, permit-by-exception policy to allow the execution of authorized software programs. If it does not, this is a finding.

Fix

Configure the operating system to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs.
V-56843 No Change
Findings ID: SRG-OS-000134-GPOS-00068 Rule ID: SV-71103r1_rule Severity: medium CCI: CCI-001084

Discussion

An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform security functions.

Security functions are the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Operating systems implement code separation (i.e., separation of security functions from nonsecurity functions) in a number of ways, including through the provision of security kernels via processor rings or processor modes. For non-kernel code, security function isolation is often achieved through file system protections that serve to protect the code on disk and address space protections that protect executing code.

Developers and implementers can increase the assurance in security functions by employing well-defined security policy models; structured, disciplined, and rigorous hardware and software development techniques; and sound system/security engineering principles. Implementation may include isolation of memory space and libraries. Operating systems restrict access to security functions through the use of access control mechanisms and by implementing least privilege capabilities.

Checks

Verify the operating system isolates security functions from nonsecurity functions. If it does not, this is a finding.

Fix

Configure the operating system to isolate security functions from nonsecurity functions.
V-56845 No Change
Findings ID: SRG-OS-000368-GPOS-00154 Rule ID: SV-71105r1_rule Severity: medium CCI: CCI-001764

Discussion

Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may provide a capability that runs counter to the mission or provides users with functionality that exceeds mission requirements. This includes functions and services installed at the operating system-level.

Some of the programs, installed by default, may be harmful or may not be necessary to support essential organizational operations (e.g., key missions, functions). Removal of executable programs is not always possible; therefore, establishing a method of preventing program execution is critical to maintaining a secure system baseline.

Methods for complying with this requirement include restricting execution of programs in certain environments, while preventing execution in other environments; or limiting execution of certain program functionality based on organization-defined criteria (e.g., privileges, subnets, sandboxed environments, or roles).

Checks

Verify the operating system prevents program execution in accordance with local policies regarding software program usage and restrictions and/or rules authorizing the terms and conditions of software program usage. If it does not, this is a finding.

Fix

Configure the operating system to prevent program execution in accordance with local policies regarding software program usage and restrictions and/or rules authorizing the terms and conditions of software program usage.
V-56849 No Change
Findings ID: SRG-OS-000366-GPOS-00153 Rule ID: SV-71109r1_rule Severity: medium CCI: CCI-001749

Discussion

Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor.

Accordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization.

Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This ensures the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.

Checks

Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization. If it does not, this is a finding.

Fix

Configure the operating system to prevent the installation of patches, service packs, device drivers, or operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization.
V-56851 No Change
Findings ID: SRG-OS-000365-GPOS-00152 Rule ID: SV-71111r1_rule Severity: medium CCI: CCI-001814

Discussion

Without auditing the enforcement of access restrictions against changes to the application configuration, it will be difficult to identify attempted attacks and an audit trail will not be available for forensic investigation for after-the-fact actions.

Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact.

Checks

Verify the operating system audits the enforcement actions used to restrict access associated with changes to the system. If it does not, this is a finding.

Fix

Configure the operating system to audit the enforcement actions used to restrict access associated with changes to the system.
V-56853 No Change
Findings ID: SRG-OS-000138-GPOS-00069 Rule ID: SV-71113r1_rule Severity: medium CCI: CCI-001090

Discussion

Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of processes acting on behalf of prior users/roles) from being available to any current users/roles (or current processes) that obtain access to shared system resources (e.g., registers, main memory, hard disks) after those resources have been released back to information systems. The control of information in shared resources is also commonly referred to as object reuse and residual information protection.

This requirement generally applies to the design of an information technology product, but it can also apply to the configuration of particular information system components that are, or use, such products. This can be verified by acceptance/validation processes in DoD or other government agencies.

There may be shared resources with configurable protections (e.g., files in storage) that may be assessed on specific information system components.

Checks

Verify operating systems prevents unauthorized and unintended information transfer via shared system resources. If it does not, this is a finding.

Fix

Configure operating systems to prevent unauthorized and unintended information transfer via shared system resources.
V-56861 No Change
Findings ID: SRG-OS-000142-GPOS-00071 Rule ID: SV-71121r1_rule Severity: medium CCI: CCI-001095

Discussion

DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.

Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning.

Checks

Verify the operating system manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of Denial of Service (DoS) attacks. If it does not, this is a finding.

Fix

Configure the operating system to manage excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of Denial of Service (DoS) attacks.
V-56865 No Change
Findings ID: SRG-OS-000163-GPOS-00072 Rule ID: SV-71125r1_rule Severity: medium CCI: CCI-001133

Discussion

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element.

Terminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level, and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.

Checks

Verify the operating system terminates all network connections associated with a communications session at the end of the session, or as follows: for in-band management sessions (privileged sessions), the session must be terminated after 10 minutes of inactivity; and for user sessions (non-privileged session), the session must be terminated after 15 minutes of inactivity, except to fulfill documented and validated mission requirements. If it does not, this is a finding.

Fix

Configure the operating system to terminate all network connections associated with a communications session at the end of the session, or as follows: for in-band management sessions (privileged sessions), the session must be terminated after 10 minutes of inactivity; and for user sessions (non-privileged session), the session must be terminated after 15 minutes of inactivity, except to fulfill documented and validated mission requirements.
V-56869 No Change
Findings ID: SRG-OS-000184-GPOS-00078 Rule ID: SV-71129r1_rule Severity: medium CCI: CCI-001190

Discussion

Failure to a known safe state helps prevent systems from failing to a state that may cause loss of data or unauthorized access to system resources. Operating systems that fail suddenly and with no incorporated failure state planning may leave the system available but with a reduced security protection capability. Preserving operating system state information also facilitates system restart and return to the operational mode of the organization with less disruption to mission-essential processes.

Abort refers to stopping a program or function before it has finished naturally. The term abort refers to both requested and unexpected terminations.

Checks

Verify the operating system fails to a secure state if system initialization fails, shutdown fails, or aborts fail. If it does not, this is a finding.

Fix

Configure the operating system to fail to a secure state if system initialization fails, shutdown fails, or aborts fail.
V-56877 No Change
Findings ID: SRG-OS-000185-GPOS-00079 Rule ID: SV-71137r1_rule Severity: medium CCI: CCI-001199

Discussion

Information at rest refers to the state of information when it is located on a secondary storage device (e.g., disk drive and tape drive, when used for backups) within an operating system.

This requirement addresses protection of user-generated data, as well as operating system-specific configuration data. Organizations may choose to employ different mechanisms to achieve confidentiality and integrity protections, as appropriate, in accordance with the security category and/or classification of the information.

Checks

Verify the operating system protects the confidentiality and integrity of all information at rest. If it does not, this is a finding.

Fix

Configure the operating system to protect the confidentiality and integrity of all information at rest.
V-56883 No Change
Findings ID: SRG-OS-000191-GPOS-00080 Rule ID: SV-71143r1_rule Severity: medium CCI: CCI-001233

Discussion

Without the use of automated mechanisms to scan for security flaws on a continuous and/or periodic basis, the operating system or other system components may remain vulnerable to the exploits presented by undetected software flaws.

To support this requirement, the operating system may have an integrated solution incorporating continuous scanning using HBSS and periodic scanning using other tools, as specified in the requirement.

Checks

Verify the operating system employs automated mechanisms to determine the state of system components with regard to flaw remediation using the following frequency: continuously, where HBSS is used; 30 days, for any additional internal network scans not covered by HBSS; and annually, for external scans by Computer Network Defense Service Provider (CNDSP). If it does not, this is a finding.

Fix

Configure the operating system to employ automated mechanisms to determine the state of system components with regard to flaw remediation using the following frequency: continuously, where HBSS is used; 30 days, for any additional internal network scans not covered by HBSS; and annually, for external scans by Computer Network Defense Service Provider (CNDSP).
V-56887 No Change
Findings ID: SRG-OS-000205-GPOS-00083 Rule ID: SV-71147r1_rule Severity: medium CCI: CCI-001312

Discussion

Any operating system providing too much information in error messages risks compromising the data and security of the structure, and content of error messages needs to be carefully considered by the organization.

Organizations carefully consider the structure/content of error messages. The extent to which information systems are able to identify and handle error conditions is guided by organizational policy and operational requirements. Information that could be exploited by adversaries includes, for example, erroneous logon attempts with passwords entered by mistake as the username, mission/business information that can be derived from (if not stated explicitly by) information recorded, and personal information, such as account numbers, social security numbers, and credit card numbers.

Checks

Verify the operating system generates error messages that provide information necessary for corrective actions without revealing information that could be exploited by adversaries. If it does not, this is a finding.

Fix

Configure the operating system to generate error messages that provide information necessary for corrective actions without revealing information that could be exploited by adversaries.
V-56903 No Change
Findings ID: SRG-OS-000206-GPOS-00084 Rule ID: SV-71163r1_rule Severity: medium CCI: CCI-001314

Discussion

Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the operating system or platform. Additionally, Personally Identifiable Information (PII) and operational information must not be revealed through error messages to unauthorized personnel or their designated representatives.

The structure and content of error messages must be carefully considered by the organization and development team. The extent to which the information system is able to identify and handle error conditions is guided by organizational policy and operational requirements.

Checks

Verify the operating system reveals error messages only to authorized users. If it does not, this is a finding.

Fix

Configure the operating system to reveal error messages only to authorized users.
V-56909 No Change
Findings ID: SRG-OS-000228-GPOS-00088 Rule ID: SV-71169r1_rule Severity: medium CCI: CCI-001384

Discussion

Display of a standardized and approved use notification before granting access to the publicly accessible operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.

System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist.

The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:

"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.

By using this IS (which includes any device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner:

"I've read & consent to terms in IS user agreem't."

Checks

Verify any publically accessible connection to the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the system.

The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:

"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.

By using this IS (which includes any device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner:

"I've read & consent to terms in IS user agreem't."

If it does not, this is a finding.

Fix

Configure any publically accessible connection to the operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system.

The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:

"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.

By using this IS (which includes any device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner:

"I've read & consent to terms in IS user agreem't."
V-56913 Updated
Findings ID: SRG-OS-000239-GPOS-00089 Rule ID: SV-71173r12_rule Severity: medium CCI: CCI-001403

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply modify an existing account. Auditing of account modification is one method for mitigating this risk.actions provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system automatically audits account modification. If it does not, this is a finding.

Fix

Configure the operating system to automatically audit account modification.
V-56917 No Change
Findings ID: SRG-OS-000240-GPOS-00090 Rule ID: SV-71177r1_rule Severity: medium CCI: CCI-001404

Discussion

When operating system accounts are disabled, user accessibility is affected. Accounts are utilized for identifying individual users or for identifying the operating system processes themselves. In order to detect and respond to events affecting user accessibility and system processing, operating systems must audit account disabling actions and, as required, notify the appropriate individuals so they can investigate the event. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system automatically audits account disabling actions. If it does not, this is a finding.

Fix

Configure the operating system to automatically audit account disabling actions.
V-56921 No Change
Findings ID: SRG-OS-000241-GPOS-00091 Rule ID: SV-71181r1_rule Severity: medium CCI: CCI-001405

Discussion

When operating system accounts are removed, user accessibility is affected. Accounts are utilized for identifying individual users or for identifying the operating system processes themselves. In order to detect and respond to events affecting user accessibility and system processing, operating systems must audit account removal actions and, as required, notify the appropriate individuals so they can investigate the event. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system automatically audits account removal actions. If it does not, this is a finding.

Fix

Configure the operating system to automatically audit account removal actions.
V-56935 No Change
Findings ID: SRG-OS-000250-GPOS-00093 Rule ID: SV-71195r1_rule Severity: medium CCI: CCI-001453

Discussion

Without cryptographic integrity protections, information can be altered by unauthorized users without detection.

Remote access (e.g., RDP) is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.

Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash.

Checks

Verify the operating system implements cryptography to protect the integrity of remote access sessions. If it does not, this is a finding.

Fix

Configure the operating system to implement cryptography to protect the integrity of remote access sessions.
V-56939 No Change
Findings ID: SRG-OS-000254-GPOS-00095 Rule ID: SV-71199r1_rule Severity: medium CCI: CCI-001464

Discussion

If auditing is enabled late in the start-up process, the actions of some start-up processes may not be audited. Some audit systems also maintain state information only available if auditing is enabled before a given process is created.

Checks

Verify the operating system initiates session audits at system start-up. If it does not, this is a finding.

Fix

Configure the operating system to initiate session audits at system start-up.
V-57169 No Change
Findings ID: SRG-OS-000364-GPOS-00151 Rule ID: SV-71429r1_rule Severity: medium CCI: CCI-001813

Discussion

Failure to provide logical access restrictions associated with changes to system configuration may have significant effects on the overall security of the system.

When dealing with access restrictions pertaining to change control, it should be noted that any changes to the hardware, software, and/or firmware components of the operating system can have significant effects on the overall security of the system.

Accordingly, only qualified and authorized individuals should be allowed to obtain access to operating system components for the purposes of initiating changes, including upgrades and modifications.

Logical access restrictions include, for example, controls that restrict access to workflow automation, media libraries, abstract layers (e.g., changes implemented into third-party interfaces rather than directly into information systems), and change windows (e.g., changes occur only during specified times, making unauthorized changes easy to discover).

Checks

Verify the operating system enforces access restrictions. If it does not, this is a finding.

Fix

Configure the operating system to enforce access restrictions.
V-57171 No Change
Findings ID: SRG-OS-000255-GPOS-00096 Rule ID: SV-71431r1_rule Severity: medium CCI: CCI-001487

Discussion

Without information that establishes the identity of the subjects (i.e., users or processes acting on behalf of users) associated with the events, security personnel cannot determine responsibility for the potentially harmful event.

Checks

Verify the operating system produces audit records containing information to establish the identity of any individual or process associated with the event. If it does not, this is a finding.

Fix

Configure the operating system to produce audit records containing information to establish the identity of any individual or process associated with the event.
V-57173 No Change
Findings ID: SRG-OS-000256-GPOS-00097 Rule ID: SV-71433r1_rule Severity: medium CCI: CCI-001493

Discussion

Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information.

Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user enjoys in order to make access decisions regarding the access to audit tools.

Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.

Checks

Verify the operating system protects audit tools from unauthorized access. If it does not, this is a finding.

Fix

Configure the operating system to protect audit tools from unauthorized access.
V-57175 No Change
Findings ID: SRG-OS-000257-GPOS-00098 Rule ID: SV-71435r1_rule Severity: medium CCI: CCI-001494

Discussion

Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information.

Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user has in order to make access decisions regarding the modification of audit tools.

Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.

Checks

Verify the operating system protects audit tools from unauthorized modification. If it does not, this is a finding.

Fix

Configure the operating system to protect audit tools from unauthorized modification.
V-57177 No Change
Findings ID: SRG-OS-000258-GPOS-00099 Rule ID: SV-71437r1_rule Severity: medium CCI: CCI-001495

Discussion

Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information.

Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user has in order to make access decisions regarding the deletion of audit tools.

Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.

Checks

Verify the operating system protects audit tools from unauthorized deletion. If it does not, this is a finding.

Fix

Configure the operating system to protect audit tools from unauthorized deletion.
V-57179 No Change
Findings ID: SRG-OS-000363-GPOS-00150 Rule ID: SV-71439r1_rule Severity: medium CCI: CCI-001744

Discussion

Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security.

Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's IMO/ISSO and SAs must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.

Checks

Verify the operating system notifies designated personnel if baseline configurations are changed in an unauthorized manner. If it does not, this is a finding.

Fix

Configure the operating system to notify designated personnel if baseline configurations are changed in an unauthorized manner.
V-57181 No Change
Findings ID: SRG-OS-000362-GPOS-00149 Rule ID: SV-71441r1_rule Severity: medium CCI: CCI-001812

Discussion

Allowing regular users to install software, without explicit privileges, creates the risk that untested or potentially malicious software will be installed on the system. Explicit privileges (escalated or administrative privileges) provide the regular user with explicit capabilities and control that exceeds the rights of a regular user.

Operating system functionality will vary, and while users are not permitted to install unapproved software, there may be instances where the organization allows the user to install approved software packages, such as from an approved software repository.

The operating system or software configuration management utility must enforce control of software installation by users based upon what types of software installations are permitted (e.g., updates and security patches to existing software) and what types of installations are prohibited (e.g., software whose pedigree with regard to being potentially malicious is unknown or suspect) by the organization.

Checks

Verify the operating system prohibits user installation of system software without explicit privileged status. If it does not, this is a finding.

Fix

Configure the operating system to prohibit user installation of system software without explicit privileged status.
V-57183 No Change
Findings ID: SRG-OS-000259-GPOS-00100 Rule ID: SV-71443r1_rule Severity: medium CCI: CCI-001499

Discussion

If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process.

This requirement applies to operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals shall be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks

Verify the operating system limits privileges to change software resident within software libraries. If it does not, this is a finding.

Fix

Configure the operating system to limit privileges to change software resident within software libraries.
V-57185 No Change
Findings ID: SRG-OS-000360-GPOS-00147 Rule ID: SV-71445r1_rule Severity: medium CCI: CCI-000366

Discussion

An authorized user may intentionally or accidentally move or delete audit records without those specific actions being authorized.

All bulk manipulation of audit information must be authorized via automatic processes. Any manual manipulation of audit information must require dual authorization. Dual authorization mechanisms require the approval of two authorized individuals to execute.

Checks

Verify the operating system enforces dual authorization for movement and/or deletion of all audit information, when such movement or deletion is not part of an authorized automatic process. If it does not, this is a finding.

Fix

Configure the operating system to enforce dual authorization for movement and/or deletion of all audit information, when such movement or deletion is not part of an authorized automatic process.
V-57187 No Change
Findings ID: SRG-OS-000266-GPOS-00101 Rule ID: SV-71447r1_rule Severity: medium CCI: CCI-001619

Discussion

Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity or strength is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.

Password complexity is one factor in determining how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Special characters are those characters that are not alphanumeric. Examples include: ~ ! @ # $ % ^ *.

Checks

Verify the operating system enforces password complexity by requiring that at least one special character be used. If it does not, this is a finding.

Fix

Configure the operating system to enforce password complexity by requiring that at least one special character be used.
V-57189 No Change
Findings ID: SRG-OS-000359-GPOS-00146 Rule ID: SV-71449r1_rule Severity: medium CCI: CCI-001890

Discussion

If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analysis.

Time stamps generated by the operating system include date and time. Time is commonly expressed in Coordinated Universal Time (UTC), a modern continuation of Greenwich Mean Time (GMT), or local time with an offset from UTC.

Checks

Verify the operating system records time stamps for audit records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT). If it does not, this is a finding.

Fix

Configure the operating system to record time stamps for audit records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).
V-57191 No Change
Findings ID: SRG-OS-000269-GPOS-00103 Rule ID: SV-71451r1_rule Severity: medium CCI: CCI-001665

Discussion

Failure to a known state can address safety or security in accordance with the mission/business needs of the organization. Failure to a known secure state helps prevent a loss of confidentiality, integrity, or availability in the event of a failure of the information system or a component of the system.

Preserving operating system state information helps to facilitate operating system restart and return to the operational mode of the organization with least disruption to mission/business processes.

Checks

Verify, in the event of a system failure, the operating system preserves any information necessary to determine cause of failure and any information necessary to return to operations with least disruption to mission processes. If it does not, this is a finding.

Fix

Configure the operating system to preserve any information necessary to determine cause of failure and any information necessary to return to operations with least disruption to mission processes, in the event of a system failure.
V-57193 No Change
Findings ID: SRG-OS-000358-GPOS-00145 Rule ID: SV-71453r1_rule Severity: medium CCI: CCI-001889

Discussion

Without sufficient granularity of time stamps, it is not possible to adequately determine the chronological order of records.

Time stamps generated by the operating system include date and time. Granularity of time measurements refers to the degree of synchronization between information system clocks and reference clocks.

Checks

Verify the operating system records time stamps for audit records that meet a minimum granularity of one second for a minimum degree of precision. If it does not, this is a finding.

Fix

Configure the operating system to record time stamps for audit records that meet a minimum granularity of one second for a minimum degree of precision.
V-57195 Updated
Findings ID: SRG-OS-000274-GPOS-00104 Rule ID: SV-71455r12_rule Severity: medium CCI: CCI-001683

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Notification of account creation is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail, which documents the creation of operating system user accounts and notifies System Aadministrators and Information System Security Officers (ISSO)SSOs that it exists. Such a process greatly reduces the risk that accounts will be surreptitiously created and provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system notifies System Administrators and Information System Security Officers when accounts are created. If it does not, this is a finding.

Fix

Configure the operating system to notify System Administrators and Information System Security Officers when accounts are created.
V-57197 Updated
Findings ID: SRG-OS-000275-GPOS-00105 Rule ID: SV-71457r12_rule Severity: medium CCI: CCI-001684

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply modify an existing account. Notification of account modification is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail, which documents the cremodification of operating system user accounts and notifies Sthe system Aadministrators and Information System Security Officers (ISSO) that it existSSO of changes. Such a process greatly reduces the risk that accounts will be surreptitiously created and provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system notifies System Administrators and Information System Security Officers when accounts are modified. If it does not, this is a finding.

Fix

Configure the operating system to notify System Administrators and Information System Security Officers when accounts are modified.
V-57199 Updated
Findings ID: SRG-OS-000276-GPOS-00106 Rule ID: SV-71459r12_rule Severity: medium CCI: CCI-001685

Discussion

When operating system accounts are disabled, user accessibility is affected. Accounts are utilized for identifying individual operating system users or for identifying the operating system processes themselves.

In order to detect and respond to events that affect user accessibility and system processing, operating systems must audit account disabling actions and, as required, notify S
Sending notification of account disabling events to the system Aadministrators and Information System Security Officers (ISSO) so they can investigate the eventSSO is one method for mitigating this risk. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system notifies System Administrators and Information System Security Officers when accounts are disabled. If it does not, this is a finding.

Fix

Configure the operating system to notify System Administrators and Information System Security Officers when accounts are disabled.
V-57201 Updated
Findings ID: SRG-OS-000277-GPOS-00107 Rule ID: SV-71461r12_rule Severity: medium CCI: CCI-001686

Discussion

When operating system accounts are removed, user accessibility is affected. Accounts are utilized for identifying individual operating system users or for identifying the operating system processes themselves.

In order to detect and respond to events that affect user accessibility and system processing, operating systems must audit account removal actions and, as required, notify S
Sending notification of account removal events to the system Aadministrators and Information System Security Officers (ISSO) so they can investigate the eventSSO is one method for mitigating this risk. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system notifies System Administrators and Information System Security Officers for account removal actions. If it does not, this is a finding.

Fix

Configure the operating system to notify System Administrators and Information System Security Officers for account removal actions.
V-57203 No Change
Findings ID: SRG-OS-000356-GPOS-00144 Rule ID: SV-71463r1_rule Severity: medium CCI: CCI-002046

Discussion

Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events.

Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider setting time periods for different types of systems (e.g., financial, legal, or mission-critical systems).

Organizations should also consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). This requirement is related to the comparison done every 24 hours in SRG-OS-000355 because a comparison must be done in order to determine the time difference.

Checks

Verify the operating system synchronizes internal information system clocks to the authoritative time source when the time difference is greater than one second. If it does not, this is a finding.

Fix

Configure the operating system to synchronize internal information system clocks to the authoritative time source when the time difference is greater than the organization-defined time period.
V-57205 No Change
Findings ID: SRG-OS-000278-GPOS-00108 Rule ID: SV-71465r1_rule Severity: medium CCI: CCI-001496

Discussion

Protecting the integrity of the tools used for auditing purposes is a critical step toward ensuring the integrity of audit information. Audit information includes all information (e.g., audit records, audit settings, and audit reports) needed to successfully audit information system activity.

Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.

It is not uncommon for attackers to replace the audit tools or inject code into the existing tools with the purpose of providing the capability to hide or erase system activity from the audit logs.

To address this risk, audit tools must be cryptographically signed in order to provide the capability to identify when the audit tools have been modified, manipulated, or replaced. An example is a checksum hash of the file or files.

Checks

Verify the operating system uses cryptographic mechanisms to protect the integrity of audit tools. If it does not, this is a finding.

Fix

Configure the operating system to use cryptographic mechanisms to protect the integrity of audit tools.
V-57207 No Change
Findings ID: SRG-OS-000279-GPOS-00109 Rule ID: SV-71467r1_rule Severity: medium CCI: CCI-002361

Discussion

Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections that are associated with communications sessions (i.e., network disconnect). A logical session (for local, network, and remote access) is initiated whenever a user (or process acting on behalf of a user) accesses an organizational information system. Such user sessions can be terminated (and thus terminate user access) without terminating network sessions.

Session termination terminates all processes associated with a user's logical session except those processes that are specifically created by the user (i.e., session owner) to continue after the session is terminated.

Conditions or trigger events requiring automatic session termination can include, for example, organization-defined periods of user inactivity, targeted responses to certain types of incidents, and time-of-day restrictions on information system use.

This capability is typically reserved for specific operating system functionality where the system owner, data owner, or organization requires additional assurance.

Checks

Verify the operating system automatically terminates a user session after inactivity time-outs have expired or at shutdown. If it does not, this is a finding.

Fix

Configure the operating system to automatically terminate a user session after inactivity time-outs have expired or at shutdown.
V-57209 No Change
Findings ID: SRG-OS-000280-GPOS-00110 Rule ID: SV-71469r1_rule Severity: medium CCI: CCI-002363

Discussion

If a user cannot explicitly end an operating system session, the session may remain open and be exploited by an attacker; this is referred to as a zombie session.

Information resources to which users gain access via authentication include, for example, local workstations and remote services. For some types of interactive sessions, including, for example, remote logon, information systems typically send logoff messages as final messages prior to terminating sessions.

Checks

Verify the operating system provides a logoff capability for user-initiated communications sessions when requiring user access authentication. If it does not, this is a finding.

Fix

Configure the operating system to provide a logoff capability for user-initiated communications sessions when requiring user access authentication.
V-57211 No Change
Findings ID: SRG-OS-000281-GPOS-00111 Rule ID: SV-71471r1_rule Severity: medium CCI: CCI-002364

Discussion

If a user cannot explicitly end an operating system session, the session may remain open and be exploited by an attacker; this is referred to as a zombie session. Users need to be aware of whether or not the session has been terminated.

Information resources to which users gain access via authentication include, for example, local workstations and remote services. Logoff messages can be displayed after authenticated sessions have been terminated. However, for some types of interactive sessions, including, for example, remote logon, information systems typically send logoff messages as final messages prior to terminating sessions.

Checks

Verify the operating system displays an explicit logoff message to users indicating the reliable termination of authenticated communications sessions. If it does not, this is a finding.

Fix

Configure the operating system to display an explicit logoff message to users indicating the reliable termination of authenticated communications sessions.
V-57213 No Change
Findings ID: SRG-OS-000297-GPOS-00115 Rule ID: SV-71473r1_rule Severity: medium CCI: CCI-002314

Discussion

Remote access services, such as those providing remote access to network devices and information systems, which lack automated control capabilities, increase risk and make remote user access management difficult at best.

Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.

Operating system functionality (e.g., RDP) must be capable of taking enforcement action if the audit reveals unauthorized activity. Automated control of remote access sessions allows organizations to ensure ongoing compliance with remote access policies by enforcing connection rules of remote access applications on a variety of information system components (e.g., servers, workstations, notebook computers, smartphones, and tablets).

Checks

Verify the operating system controls remote access methods. If it does not, this is a finding.

Fix

Configure the operating system to control remote access methods.
V-57215 No Change
Findings ID: SRG-OS-000298-GPOS-00116 Rule ID: SV-71475r1_rule Severity: medium CCI: CCI-002322

Discussion

Without the ability to immediately disconnect or disable remote access, an attack or other compromise taking place would not be immediately stopped.

Operating system remote access functionality must have the capability to immediately disconnect current users remotely accessing the information system and/or disable further remote access. The speed of disconnect or disablement varies based on the criticality of missions functions and the need to eliminate immediate or future remote access to organizational information systems.

The remote access functionality (e.g., RDP) may implement features such as automatic disconnect (or user-initiated disconnect) in case of adverse information based on an indicator of compromise or attack.

Checks

Verify the operating system provides the capability to immediately disconnect or disable remote access to the operating system. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability to immediately disconnect or disable remote access to the operating system.
V-57217 No Change
Findings ID: SRG-OS-000299-GPOS-00117 Rule ID: SV-71477r1_rule Severity: medium CCI: CCI-001444

Discussion

Allowing devices and users to connect to or from the system without first authenticating them allows untrusted access and can lead to a compromise or attack. Since wireless communications can be intercepted, it is necessary to use encryption to protect the confidentiality of information in transit.

Wireless technologies include, for example, microwave, packet radio (UHF/VHF), 802.11x, and Bluetooth. Wireless networks use authentication protocols (e.g., EAP/TLS, PEAP), which provide credential protection and mutual authentication.

This requirement applies to those operating systems that control wireless devices.

Checks

Verify the operating system protects wireless access to and from the system using encryption. If it does not, this is a finding.

Fix

Configure the operating system to protect wireless access to and from the system using encryption.
V-57219 No Change
Findings ID: SRG-OS-000300-GPOS-00118 Rule ID: SV-71479r1_rule Severity: medium CCI: CCI-001443

Discussion

Allowing devices and users to connect to the system without first authenticating them allows untrusted access and can lead to a compromise or attack.

Wireless technologies include, for example, microwave, packet radio (UHF/VHF), 802.11x, and Bluetooth. Wireless networks use authentication protocols (e.g., EAP/TLS, PEAP), which provide credential protection and mutual authentication.

This requirement applies to those operating systems that control wireless devices.

Checks

Verify the operating system protects wireless access to the system using authentication of users and/or devices. If it does not, this is a finding.

Fix

Configure the operating system to protect wireless access to the system using authentication of users and/or devices.
V-57221 Updated
Findings ID: SRG-OS-000303-GPOS-00120 Rule ID: SV-71481r12_rule Severity: medium CCI: CCI-002130

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply enable a new or disabled account. Notification of account enabling is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail, which documents the creation of operating system user accounts and notifies System Administrators and Information System Security Officers (ISSO) that it exists. Such a process greatly reduces the risk that accounts will be surreptitiously created and Auditing account modification actions provides logging that can be used for forensic purposes.

To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system automatically audits account enabling actions. If it does not, this is a finding.

Fix

Configure the operating system to automatically audit account enabling actions.
V-57223 Updated
Findings ID: SRG-OS-000304-GPOS-00121 Rule ID: SV-71483r12_rule Severity: medium CCI: CCI-002132

Discussion

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply enable a new orn existing disabled account. N Sending notification of account enabling is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail, which documents the creation of operating system user accounts and notifies System Administrators and Information System Security Officers (ISSO) that it exists. Such a process greatly reduces the risk that accounts will be surreptitiously enabled andactions to the system administrator and ISSO is one method for mitigating this risk. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes.

In order to detect and respond to events that affect user accessibility and application processing, operating systems must audit account enabling actions and, as required, notify the appropriate individuals so they can investigate the event.


To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Checks

Verify the operating system notifies the System Administrator and Information System Security Officer(s) when accounts are created, or enabled when previously disabled. If it does not, this is a finding.

Fix

Configure the operating system to notify the System Administrator(s) and Information System Security Officer(s) when accounts are created, or enabled when previously disabled.
V-57225 No Change
Findings ID: SRG-OS-000312-GPOS-00122 Rule ID: SV-71485r1_rule Severity: medium CCI: CCI-002165

Discussion

Discretionary Access Control (DAC) is based on the notion that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in which mode (e.g., read or write). Ownership is usually acquired as a consequence of creating the object or via specified ownership assignment. DAC allows the owner to determine who will have access to objects they control. An example of DAC includes user-controlled file permissions.

When discretionary access control policies are implemented, subjects are not constrained with regard to what actions they can take with information for which they have already been granted access. Thus, subjects that have been granted access to information are not prevented from passing (i.e., the subjects have the discretion to pass) the information to other subjects or objects. A subject that is constrained in its operation by Mandatory Access Control policies is still able to operate under the less rigorous constraints of this requirement. Thus, while Mandatory Access Control imposes constraints preventing a subject from passing information to another subject operating at a different sensitivity level, this requirement permits the subject to pass the information to any subject at the same sensitivity level. The policy is bounded by the information system boundary. Once the information is passed outside the control of the information system, additional means may be required to ensure the constraints remain in effect. While the older, more traditional definitions of discretionary access control require identity-based access control, that limitation is not required for this use of discretionary access control.

Checks

Verify the operating system allows operating system admins to pass information to any other operating system admin or user. If it does not, this is a finding.

Fix

Configure the operating system to allow operating system admins to pass information to any other operating system admin or user.
V-57227 No Change
Findings ID: SRG-OS-000312-GPOS-00123 Rule ID: SV-71487r1_rule Severity: medium CCI: CCI-002165

Discussion

Discretionary Access Control (DAC) is based on the notion that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in which mode (e.g., read or write). Ownership is usually acquired as a consequence of creating the object or via specified ownership assignment. DAC allows the owner to determine who will have access to objects they control. An example of DAC includes user-controlled file permissions.

When discretionary access control policies are implemented, subjects are not constrained with regard to what actions they can take with information for which they have already been granted access. Thus, subjects that have been granted access to information are not prevented from passing (i.e., the subjects have the discretion to pass) the information to other subjects or objects. A subject that is constrained in its operation by Mandatory Access Control policies is still able to operate under the less rigorous constraints of this requirement. Thus, while Mandatory Access Control imposes constraints preventing a subject from passing information to another subject operating at a different sensitivity level, this requirement permits the subject to pass the information to any subject at the same sensitivity level. The policy is bounded by the information system boundary. Once the information is passed outside the control of the information system, additional means may be required to ensure the constraints remain in effect. While the older, more traditional definitions of discretionary access control require identity-based access control, that limitation is not required for this use of discretionary access control.

Checks

Verify the operating system allows operating system admins to grant their privileges to other operating system admins. If it does not, this is a finding.

Fix

Configure the operating system to allow operating system admins to grant their privileges to other operating system admins.
V-57229 No Change
Findings ID: SRG-OS-000312-GPOS-00124 Rule ID: SV-71489r1_rule Severity: medium CCI: CCI-002165

Discussion

Discretionary Access Control (DAC) is based on the notion that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in which mode (e.g., read or write). Ownership is usually acquired as a consequence of creating the object or via specified ownership assignment. DAC allows the owner to determine who will have access to objects they control. An example of DAC includes user-controlled file permissions.

When discretionary access control policies are implemented, subjects are not constrained with regard to what actions they can take with information for which they have already been granted access. Thus, subjects that have been granted access to information are not prevented from passing (i.e., the subjects have the discretion to pass) the information to other subjects or objects. A subject that is constrained in its operation by Mandatory Access Control policies is still able to operate under the less rigorous constraints of this requirement. Thus, while Mandatory Access Control imposes constraints preventing a subject from passing information to another subject operating at a different sensitivity level, this requirement permits the subject to pass the information to any subject at the same sensitivity level. The policy is bounded by the information system boundary. Once the information is passed outside the control of the information system, additional means may be required to ensure the constraints remain in effect. While the older, more traditional definitions of discretionary access control require identity-based access control, that limitation is not required for this use of discretionary access control.

Checks

Verify the operating system allows operating system admins to change security attributes on users, the operating system, or the operating system's components. If it does not, this is a finding.

Fix

Configure the operating system to allow operating system admins to change security attributes on users, the operating system, or the operating system's components.
V-57231 No Change
Findings ID: SRG-OS-000324-GPOS-00125 Rule ID: SV-71491r1_rule Severity: medium CCI: CCI-002235

Discussion

Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges.

Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.

Checks

Verify that the operating system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. If it does not, this is a finding.

Fix

Configure the operating system to prevent non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.
V-57233 No Change
Findings ID: SRG-OS-000326-GPOS-00126 Rule ID: SV-71493r1_rule Severity: medium CCI: CCI-002233

Discussion

In certain situations, software applications/programs need to execute with elevated privileges to perform required functions. However, if the privileges required for execution are at a higher level than the privileges assigned to organizational users invoking such applications/programs, those users are indirectly provided with greater privileges than assigned by the organizations.

Some programs and processes are required to operate at a higher privilege level and therefore should be excluded from the organization-defined software list after review.

Checks

Verify that the operating system prevents all software from executing at higher privilege levels than users executing the software. If it does not, this is a finding.

Fix

Configure the operating system to prevent all software from executing at higher privilege levels than users executing the software.
V-57235 No Change
Findings ID: SRG-OS-000327-GPOS-00127 Rule ID: SV-71495r1_rule Severity: medium CCI: CCI-002234

Discussion

Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.

Checks

Verify that the operating system audits the execution of privileged functions. If it does not, this is a finding.

Fix

Configure the operating system to audit the execution of privileged functions.
V-57237 No Change
Findings ID: SRG-OS-000329-GPOS-00128 Rule ID: SV-71497r1_rule Severity: medium CCI: CCI-002238

Discussion

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.

Checks

Verify the operating system automatically locks an account until the locked account is released by an administrator when three unsuccessful logon attempts in 15 minutes are made. If it does not, this is a finding.

Fix

Configure the operating system to automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts in 15 minutes are made.
V-57239 No Change
Findings ID: SRG-OS-000337-GPOS-00129 Rule ID: SV-71499r1_rule Severity: medium CCI: CCI-001914

Discussion

If authorized individuals do not have the ability to modify auditing parameters in response to a changing threat environment, the organization may not be able to effectively respond, and important forensic information may be lost.

This requirement enables organizations to extend or limit auditing as necessary to meet organizational requirements. Auditing that is limited to conserve information system resources may be extended to address certain threat situations. In addition, auditing may be limited to a specific set of events to facilitate audit reduction, analysis, and reporting.

Checks

Verify the operating system provides the capability for assigned IMOs/ISSOs or designated SAs to change the auditing to be performed on all operating system components, based on all selectable event criteria in near real time. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability for assigned IMOs/ISSOs or designated SAs to change the auditing to be performed on all operating system components, based on all selectable event criteria in near real time.
V-57241 No Change
Findings ID: SRG-OS-000338-GPOS-00130 Rule ID: SV-71501r1_rule Severity: medium CCI: CCI-001919

Discussion

Without the capability to select a user session to capture/record or view/hear, investigations into suspicious or harmful events would be hampered by the volume of information captured. The volume of information captured may also adversely impact the operation of the network.

Session audits may include monitoring keystrokes, screen monitoring software, remote desktop recording, screen mirroring, and recording information and/or file transfers.

Checks

Verify the operating system provides the capability for authorized users to select a user session to capture/record or view/hear. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability for authorized users to select a user session to capture/record or view/hear.
V-57243 No Change
Findings ID: SRG-OS-000339-GPOS-00131 Rule ID: SV-71503r1_rule Severity: medium CCI: CCI-001920

Discussion

Without the capability to remotely view/hear all content related to a user session, investigations into suspicious user activity would be hampered. Real-time monitoring allows authorized personnel to take action before additional damage is done. The ability to observe user sessions as they are happening allows for interceding in ongoing events that after-the-fact review of captured content would not allow.

Checks

Verify the operating system provides the capability for authorized users to remotely view/hear, in real time, all content related to an established user session from a component separate from the operating system being monitored. If it does not, this is a finding.

Fix

Configure the operating system to provide the capability for authorized users to remotely view/hear, in real time, all content related to an established user session from a component separate from the operating system being monitored.
V-57245 No Change
Findings ID: SRG-OS-000341-GPOS-00132 Rule ID: SV-71505r1_rule Severity: medium CCI: CCI-001849

Discussion

In order to ensure operating systems have a sufficient storage capacity in which to write the audit logs, operating systems need to be able to allocate audit record storage capacity.

The task of allocating audit record storage capacity is usually performed during initial installation of the operating system.

Checks

Verify the operating system allocates audit record storage capacity to store at least one week's worth of audit records, when audit records are not immediately sent to a central audit record storage facility. If it does not, this is a finding.

Fix

Configure the operating system to allocate audit record storage capacity to store at least one week's worth of audit records, when audit records are not immediately sent to a central audit record storage facility.
V-57247 No Change
Findings ID: SRG-OS-000342-GPOS-00133 Rule ID: SV-71507r1_rule Severity: medium CCI: CCI-001851

Discussion

Information stored in one location is vulnerable to accidental or incidental deletion or alteration.

Off-loading is a common process in information systems with limited audit storage capacity.

Checks

Verify the operating system off-loads audit records onto a different system or media from the system being audited. If it does not, this is a finding.

Fix

Configure the operating system to off-load audit records onto a different system or media from the system being audited.
V-57249 No Change
Findings ID: SRG-OS-000343-GPOS-00134 Rule ID: SV-71509r1_rule Severity: medium CCI: CCI-001855

Discussion

If security personnel are not notified immediately when storage volume reaches 75% utilization, they are unable to plan for audit record storage capacity expansion.

Checks

Verify the operating system immediately notifies the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity. If it does not, this is a finding.

Fix

Configure the operating system to immediately notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity.
V-57251 No Change
Findings ID: SRG-OS-000344-GPOS-00135 Rule ID: SV-71511r1_rule Severity: medium CCI: CCI-001858

Discussion

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without a real-time alert, security personnel may be unaware of an impending failure of the audit capability and system operation may be adversely affected.

Alerts provide organizations with urgent messages. Real-time alerts provide these messages immediately (i.e., the time from event detection to alert occurs in seconds or less).

Checks

Verify the operating system provides an immediate real-time alert to the SA and ISSO, at a minimum, of all audit failure events requiring real-time alerts. If it does not, this is a finding.

Fix

Configure the operating system to provide an immediate real-time alert to the SA and ISSO, at a minimum, of all audit failure events requiring real-time alerts.
V-57253 No Change
Findings ID: SRG-OS-000348-GPOS-00136 Rule ID: SV-71513r1_rule Severity: medium CCI: CCI-001875

Discussion

The ability to perform on-demand audit review and analysis, including after the audit data has been subjected to audit reduction, greatly facilitates the organization's ability to generate incident reports, as needed, to better handle larger-scale or more complex security incidents.

Audit reduction is a technique used to reduce the volume of audit records in order to facilitate a manual review. Audit reduction does not alter original audit records. The report generation capability provided by the application must support on-demand (i.e., customizable, ad hoc, and as-needed) reports.

Checks

Verify the operating system provides an audit reduction capability that supports on-demand audit review and analysis. If it does not, this is a finding.

Fix

Configure the operating system to provide an audit reduction capability that supports on-demand audit review and analysis.
V-57255 No Change
Findings ID: SRG-OS-000349-GPOS-00137 Rule ID: SV-71515r1_rule Severity: medium CCI: CCI-001877

Discussion

If the audit reduction capability does not support after-the-fact investigations, it is difficult to establish, correlate, and investigate the events leading up to an outage or attack or identify those responses for one. This capability is also required to comply with applicable Federal laws and DoD policies.

Audit reduction capability must support after-the-fact investigations of security incidents either natively or through the use of third-party tools.

This requirement is specific to operating systems with audit reduction capabilities.

Checks

Verify the operating system provides an audit reduction capability that supports after-the-fact investigations of security incidents. If it does not, this is a finding.

Fix

Configure the operating system to provide an audit reduction capability that supports after-the-fact investigations of security incidents.
V-57257 No Change
Findings ID: SRG-OS-000350-GPOS-00138 Rule ID: SV-71517r1_rule Severity: medium CCI: CCI-001878

Discussion

The report generation capability must support on-demand review and analysis in order to facilitate the organization's ability to generate incident reports, as needed, to better handle larger-scale or more complex security incidents.

Report generation must be capable of generating on-demand (i.e., customizable, ad hoc, and as-needed) reports. On-demand reporting allows personnel to report issues more rapidly to more effectively meet reporting requirements. Collecting log data and aggregating it to present the data in a single, consolidated report achieves this objective.

Checks

Verify the operating system provides a report generation capability that supports on-demand audit review and analysis. If it does not, this is a finding.

Fix

Configure the operating system to provide a report generation capability that supports on-demand audit review and analysis.
V-57259 No Change
Findings ID: SRG-OS-000351-GPOS-00139 Rule ID: SV-71519r1_rule Severity: medium CCI: CCI-001879

Discussion

The report generation capability must support on-demand reporting in order to facilitate the organization's ability to generate incident reports, as needed, to better handle larger-scale or more complex security incidents.

Report generation must be capable of generating on-demand (i.e., customizable, ad hoc, and as-needed) reports. On-demand reporting allows personnel to report issues more rapidly to more effectively meet reporting requirements. Collecting log data and aggregating it to present the data in a single, consolidated report achieves this objective.

Checks

Verify the operating system provides a report generation capability that supports on-demand reporting requirements. If it does not, this is a finding.

Fix

Ensure the operating system provides a report generation capability that supports on-demand reporting requirements.
V-57261 No Change
Findings ID: SRG-OS-000352-GPOS-00140 Rule ID: SV-71521r1_rule Severity: medium CCI: CCI-001880

Discussion

If the report generation capability does not support after-the-fact investigations, it is difficult to establish, correlate, and investigate the events leading up to an outage or attack or identify those responses for one. This capability is also required to comply with applicable Federal laws and DoD policies.

The report generation capability must support after-the-fact investigations of security incidents either natively or through the use of third-party tools.

Checks

Verify the operating system provides a report generation capability that supports after-the-fact investigations of security incidents. If it does not, this is a finding.

Fix

Ensure the operating system provides a report generation capability that supports after-the-fact investigations of security incidents.
V-57263 No Change
Findings ID: SRG-OS-000353-GPOS-00141 Rule ID: SV-71523r1_rule Severity: medium CCI: CCI-001881

Discussion

If the audit reduction capability alters the content or time ordering of audit records, the integrity of the audit records is compromised, and the records are no longer usable for forensic analysis.

Audit reduction is a process that manipulates collected audit information and organizes such information in a summary format that is more meaningful to analysts. Time ordering refers to the chronological organization of records based on time stamps. The degree of time stamp precision can affect this.

This requirement is specific to operating systems providing audit reduction capabilities. The audit reduction capability can be met either natively or through the use of third-party tools.

Checks

Verify the operating system does not alter original content or time ordering of audit records when it provides an audit reduction capability. If it does not, this is a finding.

Fix

Configure the operating system to not alter original content or time ordering of audit records when it provides an audit reduction capability.
V-57265 No Change
Findings ID: SRG-OS-000354-GPOS-00142 Rule ID: SV-71525r1_rule Severity: medium CCI: CCI-001882

Discussion

If the report generation capability alters the content or time ordering of audit records, the integrity of the audit records is compromised, and the records are no longer usable for forensic analysis.

Time ordering refers to the chronological organization of records based on time stamps. The degree of time stamp precision can affect this.

This requirement is specific to operating systems providing report generation capabilities. The report generation capability can be met either natively or through the use of third-party tools.

Checks

Verify the operating system does not alter original content or time ordering of audit records when it provides a report generation capability. If it does not, this is a finding.

Fix

Configure the operating system to not alter original content or time ordering of audit records when it provides a report generation capability.
V-57267 No Change
Findings ID: SRG-OS-000355-GPOS-00143 Rule ID: SV-71527r1_rule Severity: medium CCI: CCI-001891

Discussion

Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate.

Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.

Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints).

Checks

Verify the operating system, for networked systems, compares internal information system clocks at least every 24 hours with a server which is synchronized to one of the redundant United States Naval Observatory (USNO) time servers, or a time server designated for the appropriate DoD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS). If it does not, this is a finding.

Fix

Configure the operating system to, for networked systems, compare internal information system clocks at least every 24 hours with a server which is synchronized to one of the redundant United States Naval Observatory (USNO) time servers, or a time server designated for the appropriate DoD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS).
V-64813 Added
Findings ID: SRG-OS-000481-GPOS-000481 Rule ID: SV-79303r1_rule Severity: medium CCI: CCI-002418

Discussion

Without protection of communications with wireless peripherals, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read, altered, or used to compromise the operating system. This requirement applies to wireless peripheral technologies (e.g., wireless mice, keyboards, displays, etc.) used with an operating system. Wireless peripherals (e.g., Wi-Fi/Bluetooth/IR Keyboards, Mice, and Pointing Devices and Near Field Communications [NFC]) present a unique challenge by creating an open, unsecured port on a computer. Wireless peripherals must meet DoD requirements for wireless data transmission and be approved for use by the AO. Even though some wireless peripherals, such as mice and pointing devices, do not ordinarily carry information that need to be protected, modification of communications with these wireless peripherals may be used to compromise the operating system. Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of communications with wireless peripherals can be accomplished by physical means (e.g., employing physical barriers to wireless radio frequencies) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa. If the wireless peripheral is only passing telemetry data, encryption of the data may not be required.

Checks

Verify the operating system protects the confidentiality and integrity of communications with wireless peripherals. If it does not, this is a finding.

Fix

Configure the operating system to protect the confidentiality and integrity of communications with wireless peripherals.