Apple OS X 10.11 Security Technical Implementation Guide

U_Apple_OS_X_10-11_STIG_V1R6_Manual-xccdf.xml

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via e-mail to the following address: [email protected]
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Version / Release: V1R6

Published: 2018-01-04

Updated At: 2018-09-23 19:12:01

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Vuln Rule Version CCI Severity Title Description
SV-81951r1_rule AOSX-11-000005 CCI-000060 LOW The operating system must conceal, via the session lock, information previously visible on the display with a publicly viewable image. A default screensaver must be configured for all users, as the screensaver will act as a session time-out lock for the system and must be one that conceals the contents of the screen from unauthorized users. The screensaver must not display any sensitive information or reveal the contents of the locked session screen. Publicly viewable images can include static or dynamic images such as patterns used with screen savers, photographic images, solid colors, a clock, a battery life indicator, or a blank screen.
SV-81953r1_rule AOSX-11-000010 CCI-000057 MEDIUM The operating system must initiate a session lock after a 15-minute period of inactivity. A screensaver must be enabled and set to require a password to unlock. The timeout should be set to fifteen minutes of inactivity. This mitigates the risk that a user might forget to manually lock the screen before stepping away from the computer. 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.
SV-81955r1_rule AOSX-11-000020 CCI-000056 MEDIUM The operating system must retain the session lock until the user reestablishes access using established identification and authentication procedures. Users must be prompted to enter their passwords when unlocking the screensaver. The screensaver acts as a session lock and prevents unauthorized users from accessing the current user's account.
SV-81957r1_rule AOSX-11-000030 CCI-000067 MEDIUM The operating system must monitor remote access methods. Remote access services, such as those providing remote access to network devices and information systems, increase risk and expose those systems to possible cyber attacks, so all remote access should be closely monitored and audited. Only authorized users should be permitted to remotely access DoD non-public information systems. An attacker might attempt to log in as an authorized user, through stolen credentials, unpatched exploits of the remote access service, or brute force attempts to guess a valid username and password. If a user is attempting to log in to a system from an unusual location or at an unusual time, or if there are many failed attempts, there is a possibility that the system is the target of a cyber attack. Auditing logon events mitigates this risk by recording all logon attempts, successful and unsuccessful, to the system.
SV-81959r1_rule AOSX-11-000330 CCI-001891 MEDIUM The operating system must, 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). 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 of 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).
SV-81961r1_rule AOSX-11-000331 CCI-000162 MEDIUM Audit log files must be owned by root. The audit service must be configured to create log files with the correct ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81963r1_rule AOSX-11-000332 CCI-000162 MEDIUM Audit log folders must be owned by root. The audit service must be configured to create log files with the correct ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81965r1_rule AOSX-11-000333 CCI-000162 MEDIUM Audit log files must be group-owned by wheel. The audit service must be configured to create log files with the correct group-ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81967r1_rule AOSX-11-000334 CCI-000162 MEDIUM Audit log folders must be group-owned by wheel. The audit service must be configured to create log files with the correct group-ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81969r1_rule AOSX-11-000335 CCI-000162 MEDIUM Audit log files must be mode 440 or less permissive. The audit service must be configured to create log files with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81971r1_rule AOSX-11-000336 CCI-000162 MEDIUM Audit log folders must have mode 700 or less permissive. The audit service must be configured to create log folders with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log folders are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81973r1_rule AOSX-11-000337 CCI-000162 MEDIUM Log files must not contain ACLs. The audit service must be configured to create log files with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81975r1_rule AOSX-11-000338 CCI-000162 MEDIUM Log folders must not contain ACLs. The audit service must be configured to create log folders with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log folders are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
SV-81977r1_rule AOSX-11-000035 CCI-000068 HIGH The operating system must implement DoD-approved encryption to protect the confidentiality of remote access sessions. The rexec service must be disabled. The rexec service does not implement crypto and has had several security vulnerabilities in the past. It is disabled by default; enabling it would increase the attack surface of the system. Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD non-public 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 mechanism is selected based on the security categorization of the information.
SV-81981r1_rule AOSX-11-000050 CCI-000381 HIGH The rshd service must be disabled. 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 cannot be disabled. The "rshd" service must be disabled.
SV-81983r1_rule AOSX-11-000055 CCI-000366 MEDIUM The operating system must enforce requirements for remote connections to the information system. The Screen Sharing feature allows remote users to view or control the desktop of the current user. A malicious user can take advantage of screen sharing to gain full access to the system remotely, either with stolen credentials or by guessing the username and password. Disabling Screen Sharing mitigates this risk.
SV-81985r1_rule AOSX-11-000065 CCI-000366 LOW The Bluetooth software driver must be disabled. The Bluetooth kernel extension must be disabled, as wireless access introduces unnecessary security risks. Disabling Bluetooth support with a configuration profile mitigates this risk.
SV-81987r1_rule AOSX-11-000070 CCI-000366 MEDIUM Wi-Fi support software must be disabled. Use of Wi-Fi to connect to unauthorized networks may facilitate the exfiltration of mission data.
SV-81989r1_rule AOSX-11-000075 CCI-000366 MEDIUM Infrared [IR] support must be disabled. Infrared [IR] kernel support must be disabled to prevent users from controlling the system with IR devices. By default, if IR is enabled, the system will accept IR control from any remote.
SV-81991r1_rule AOSX-11-000085 CCI-000366 MEDIUM Automatic actions must be disabled for blank CDs. Applications should not be configured to launch automatically when a disk is inserted. This potentially circumvents anti-virus software and allows malicious users to craft disks that can exploit user applications. Disabling Automatic Actions for blank CDs mitigates this risk.
SV-81993r1_rule AOSX-11-000090 CCI-000366 MEDIUM Automatic actions must be disabled for blank DVDs. Applications should not be configured to launch automatically when a disk is inserted. This potentially circumvents anti-virus software and allows malicious users to craft disks that can exploit user applications. Disabling Automatic Actions for blank DVDs mitigates this risk.
SV-81995r1_rule AOSX-11-000095 CCI-000366 MEDIUM Automatic actions must be disabled for music CDs. Applications should not be configured to launch automatically when a disk is inserted. This potentially circumvents anti-virus software and allows malicious users to craft disks that can exploit user applications. Disabling Automatic Actions for music CDs mitigates this risk.
SV-81997r1_rule AOSX-11-000100 CCI-000366 MEDIUM Automatic actions must be disabled for picture CDs. Applications should not be configured to launch automatically when a disk is inserted. This potentially circumvents anti-virus software and allows malicious users to craft disks that can exploit user applications. Disabling Automatic Actions for picture CDs mitigates this risk.
SV-81999r1_rule AOSX-11-000105 CCI-000366 MEDIUM Automatic actions must be disabled for video DVDs. Applications should not be configured to launch automatically when a disk is inserted. This potentially circumvents anti-virus software and allows malicious users to craft disks that can exploit user applications. Disabling Automatic Actions for video DVDs mitigates this risk.
SV-82001r1_rule AOSX-11-000110 CCI-000016 MEDIUM The operating system must automatically remove or disable temporary user accounts after 72 hours. If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be targeted by attackers 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.
SV-82003r1_rule AOSX-11-000310 CCI-001858 MEDIUM The operating system must provide an immediate real-time alert to the SA and ISSO, at a minimum, of all audit failure events requiring real-time alerts. The audit service should be configured to immediately print messages to the console or email administrator users when an auditing failure occurs. 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.
SV-82005r1_rule AOSX-11-000305 CCI-001855 MEDIUM The operating system must provide an immediate warning to the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75% of repository maximum audit record storage capacity. The audit service must be configured to require a minimum percentage of free disk space in order to run. This ensures that audit will notify the administrator that action is required to free up more disk space for audit logs. When minfree is set to 25%, security personnel are notified immediately when the storage volume is 75% full and are able to plan for audit record storage capacity expansion.
SV-82007r1_rule AOSX-11-000295 CCI-001849 MEDIUM The operating system must allocate audit record storage capacity to store at least one weeks worth of audit records, when audit records are not immediately sent to a central audit record storage facility. The audit service must be configured to require that records are kept for 7 days or longer before deletion when there is no central audit record storage facility. When "expire-after" is set to "7d", the audit service will not delete audit logs until the log data is at least 7 days old.
SV-82011r1_rule AOSX-11-000115 CCI-001682 MEDIUM The operating system must be configured such that emergency administrator accounts are never automatically disabled. Emergency administrator accounts are privileged accounts which 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 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 system maintainers. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.
SV-82013r1_rule AOSX-11-000120 CCI-000018 MEDIUM The operating system must generate audit records for all account creations, modifications, disabling, and termination events, for privileged activities or other system-level access, all kernel module load, unload, and restart actions, all program initiations, and organizationally defined events for all non-local maintenance and diagnostic sessions. 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). Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000327-GPOS-00127, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215, SRG-OS-000471-GPOS-00216, SRG-OS-000476-GPOS-00221, SRG-OS-000477-GPOS-00222
SV-82021r1_rule AOSX-11-000139 CCI-000381 MEDIUM SMB File Sharing must be disabled unless required. File Sharing is usually non-essential and must be disabled if not required. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.
SV-82023r1_rule AOSX-11-000140 CCI-000381 MEDIUM Apple File (AFP) Sharing must be disabled. File Sharing is non-essential and must be disabled. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.
SV-82025r1_rule AOSX-11-000141 CCI-000381 MEDIUM The NFS daemon must be disabled unless required. If the system does not require access to NFS (Network File System) file shares or is not acting as an NFS server, then support for NFS is non-essential and NFS services must be disabled. NFS is a network file system protocol supported by Unix-like operating systems. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.
SV-82027r1_rule AOSX-11-000142 CCI-000381 MEDIUM The NFS lock daemon must be disabled unless required. If the system does not require access to NFS (Network File System) file shares or is not acting as an NFS server, then support for NFS is non-essential and NFS services must be disabled. NFS is a network file system protocol supported by Unix-like operating systems. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.
SV-82029r1_rule AOSX-11-000143 CCI-000381 MEDIUM The NFS stat daemon must be disabled unless required. If the system does not require access to NFS (Network File System) file shares or is not acting as an NFS server, then support for NFS is non-essential and NFS services must be disabled. NFS is a network file system protocol supported by Unix-like operating systems. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.
SV-82031r1_rule AOSX-11-000155 CCI-000366 MEDIUM The system firewall must be configured with a default-deny policy. An approved firewall must be installed and enabled to work in concert with the OS X Application Firewall. When configured correctly, firewalls protect computers from network attacks by blocking or limiting access to open network ports.
SV-82037r1_rule AOSX-11-000186 CCI-000048 LOW The SSH banner must contain the Standard Mandatory DoD Notice and Consent Banner. 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 DTM-08-060.
SV-82041r1_rule AOSX-11-000230 CCI-001464 MEDIUM The operating system must initiate session audits at system startup. If auditing is enabled late in the startup 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.
SV-82043r1_rule AOSX-11-000200 CCI-000172 MEDIUM The operating system must generate audit records for DoD defined events such as: successful/unsuccessful logon attempts, successful/unsuccessful direct access attempts, starting and ending time for user access, and concurrent logons to the same account from different sources. 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). Satisfies: SRG-OS-000470-GPOS-00214, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000475-GPOS-00220
SV-82045r1_rule AOSX-11-000195 CCI-000048 MEDIUM Any connection to the operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system. 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 DTM-08-060. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000228-GPOS-00088
SV-82047r1_rule AOSX-11-000187 CCI-000048 LOW The operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system via SSH. 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 DTM-08-060.
SV-82049r1_rule AOSX-11-000430 CCI-001749 HIGH The Security assessment policy subsystem must be enabled. Any changes to the hardware, software, and/or firmware components of the information system and/or application can potentially have significant effects on the overall security of the system. Accordingly, software defined by the organization as critical software must be signed with a certificate that is recognized and approved by the organization.
SV-82051r1_rule AOSX-11-000435 CCI-001499 MEDIUM The operating system must limit privileges to change software resident within software libraries. File permissions should be compared against the default set of permissions that were set at the time of the initial install. Changes to default file permissions can make the system less secure and disrupt the functionality of installed applications. Unless changes are required to harden a system, the default permissions should be kept. 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. Verifying that permissions remain unchanged mitigates this risk. 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.
SV-82053r1_rule AOSX-11-000455 CCI-000366 MEDIUM A configuration profile must be installed. Configuration settings must be verified by a centrally managed system such as an MDM to ensure that they have not been changed. Configuration settings are the configurable security-related parameters of information technology products that are part of the information system. Security-related parameters are those parameters impacting the security state of the system including parameters related to meeting other security control requirements. Rather than visiting each and every system when verifying configuration changes, organizations will employ automated tools that can make changes across all systems. This greatly increases efficiency and manageability of applications in a large scale environment.
SV-82055r1_rule AOSX-11-000460 CCI-001774 MEDIUM The operating system must employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs. Application Restrictions must be enabled for user accounts and configured to only allow users to execute approved applications. Utilizing a whitelist such as Application Restrictions 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.
SV-82057r1_rule AOSX-11-000475 CCI-000381 LOW The application FaceTime must be disabled. 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 cannot be disabled. The application FaceTime establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82059r1_rule AOSX-11-000480 CCI-000381 LOW The application Game Center must be disabled. 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 cannot be disabled. The application Game Center establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82061r1_rule AOSX-11-000490 CCI-000381 LOW The application Messages must be disabled. 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 cannot be disabled. The application Messages establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82063r1_rule AOSX-11-000505 CCI-000381 LOW The application Calendar must be disabled. 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 cannot be disabled. The application Calendar establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82065r1_rule AOSX-11-000507 CCI-000381 LOW The application Reminders must be disabled. 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 cannot be disabled. The application Reminders establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82067r1_rule AOSX-11-000510 CCI-000381 LOW The application Contacts must be disabled. 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 cannot be disabled. The application Contacts establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82069r1_rule AOSX-11-000515 CCI-000381 LOW The application Mail must be disabled. 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 cannot be disabled. The application Mail establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82071r1_rule AOSX-11-000517 CCI-000381 LOW The application Notes must be disabled. 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 cannot be disabled. The application Notes establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.
SV-82073r1_rule AOSX-11-000520 CCI-000381 MEDIUM The system preference panels iCloud and Internet Accounts must be disabled. 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 cannot be disabled. The system preference panel's iCloud and Internet Accounts must be disabled.
SV-82075r1_rule AOSX-11-000530 CCI-000382 MEDIUM Sending diagnostic and usage data to Apple must be disabled. 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. Sending diagnostic and usage data to Apple must be disabled.
SV-82077r1_rule AOSX-11-000531 CCI-000381 MEDIUM Find My Mac must be disabled. 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. Find My Mac must be disabled.
SV-82079r1_rule AOSX-11-000532 CCI-000381 MEDIUM Find My Mac messenger must be disabled. 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. Find My Mac messenger must be disabled.
SV-82081r1_rule AOSX-11-000535 CCI-000381 MEDIUM Location Services must be disabled. 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. Location Services must be disabled.
SV-82083r1_rule AOSX-11-000545 CCI-000381 MEDIUM Bonjour multicast advertising must be disabled on the system. 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. Bonjour multicast advertising must be disabled on the system.
SV-82085r1_rule AOSX-11-000550 CCI-000381 MEDIUM The UUCP service must be disabled. 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 cannot be disabled. The system must not have the UUCP service active.
SV-82087r1_rule AOSX-11-000565 CCI-000770 MEDIUM The operating system must require individuals to be authenticated with an individual authenticator prior to using a group authenticator. Administrator users must never log in directly as root. To assure individual accountability and prevent unauthorized access, logging in as root over a remote connection must be disabled. Administrators should only run commands as root after first authenticating with their individual user names and passwords.
SV-82089r1_rule AOSX-11-000570 CCI-001941 MEDIUM The operating system must implement replay-resistant authentication mechanisms for network access to privileged and non-privileged accounts. The SSH Version should be explicitly set to Version 2. Version 2 supports strong crypto and was rewritten from scratch to resolve several weaknesses in Version 1 that make it extremely vulnerable to attackers. The weaker crypto in Version 1 is potentially susceptible to certain forms of replay attacks. The system default is to only enable Version 2. 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. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058
SV-82093r1_rule AOSX-11-000585 CCI-000194 MEDIUM Operating systems must enforce password complexity by requiring that at least one numeric character be used. 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 determine 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.
SV-82095r1_rule AOSX-11-000587 CCI-001619 MEDIUM The operating system must enforce password complexity by requiring that at least one special character be used. 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: ~ ! @ # $ % ^ *.
SV-82097r1_rule AOSX-11-000590 CCI-000205 MEDIUM The operating system must enforce a minimum 15-character password length. The minimum password length must be set to 15 characters. 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. The use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.
SV-82099r1_rule AOSX-11-000605 CCI-000197 HIGH The operating system must implement cryptography to protect the integrity and confidentiality of data during transmission of remote access sessions, non-local maintenance sessions, and diagnostic communications. The "telnet" service must be disabled as it sends all data in a clear text form that can be easily intercepted and read. The data needs to be protected at all times during transmission and encryption is the standard method for protecting data in transit. If the data is not encrypted during transmission, it can be plainly read (i.e., clear text) and easily compromised. Disabling telnet is one way to mitigate this risk. Administrators should be instructed to use an alternate service for remote access sessions, non-local maintenance sessions, and diagnostic communications that uses encryption, such as SSH. Satisfies: SRG-OS-000074-GPOS-00042, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174
SV-82107r2_rule AOSX-11-000710 CCI-001749 MEDIUM The system must allow only applications downloaded from the App Store to run. Gatekeeper settings must be configured correctly to only allow the system to run applications downloaded from the Mac App Store or applications signed with a valid Apple Developer ID code. Administrator users will still have the option to override these settings on a per app basis. Gatekeeper is a security feature that ensures that applications must be digitally signed by an Apple issued certificate in order to run. Digital signatures allow the OS X to verify that the application has not been modified by a malicious third-party.
SV-82109r1_rule AOSX-11-000711 CCI-000366 MEDIUM End users must not be able to override Gatekeeper settings. "Gatekeeper" must be configured with a configuration profile in order to prevent normal users from overriding its setting. If users are allowed to disable Gatekeeper or set it to a less restrictive setting, then it is possible that malware could be introduced into the system. Gatekeeper is a security feature that ensures that applications must be digitally signed by an Apple issued certificate in order to run. Digital signatures allow Mac OS X to verify that the application has not been modified by a malicious third-party.
SV-82111r1_rule AOSX-11-000720 CCI-001133 MEDIUM The SSH daemon ClientAliveInterval option must be set correctly. SSH should be configured to log users out after a "15" minute interval of inactivity and to only wait "30" seconds before timing out login attempts. 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 or an incomplete login attempt will also free up resources committed by the managed network element.
SV-82113r1_rule AOSX-11-000721 CCI-001133 MEDIUM The SSH daemon ClientAliveCountMax option must be set correctly. SSH should be configured to log users out after a "15" minute interval of inactivity and to only wait "30" seconds before timing out login attempts. 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 or an incomplete login attempt will also free up resources committed by the managed network element.
SV-82139r1_rule AOSX-11-002110 CCI-001814 MEDIUM The operating system must audit the enforcement actions used to restrict access associated with changes to the system. By auditing access restriction enforcement, changes to application and OS configuration files can be audited. Without auditing the enforcement of access restrictions, it will be difficult to identify attempted attacks and an audit trail will not be available for forensic investigation. 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.
SV-82141r1_rule AOSX-11-002107 CCI-001314 MEDIUM ACLs for system log files must be set correctly. System logs should only be readable by root or admin users. System logs frequently contain sensitive information that could be used by an attacker. Setting the correct ACLs mitigates this risk.
SV-82143r1_rule AOSX-11-002106 CCI-001314 MEDIUM System log files must be mode 640 or less permissive. System logs should only be readable by root or admin users. System logs frequently contain sensitive information that could be used by an attacker. Setting the correct permissions mitigates this risk.
SV-82145r1_rule AOSX-11-002105 CCI-001314 MEDIUM System log files must be owned by root and group-owned by wheel or admin. System logs should only be readable by root or admin users. System logs frequently contain sensitive information that could be used by an attacker. Setting the correct owner mitigates this risk.
SV-82147r1_rule AOSX-11-002100 CCI-000172 MEDIUM The operating system must generate audit records when successful/unsuccessful attempts to access/modify privileges occur. Frequently, an attacker that successfully gains access to a system has only gained access to an account with limited privileges, such as a guest account or a service account. The attacker must attempt to change to another user account with normal or elevated privileges in order to proceed. Auditing successful and unsuccessful attempts to switch to another user account and the escalation of privileges mitigates this risk. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206
SV-82151r1_rule AOSX-11-002090 CCI-000200 MEDIUM The operating system must prohibit password reuse for a minimum of five generations. 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.
SV-82153r1_rule AOSX-11-002085 CCI-000199 MEDIUM Operating systems must enforce a 60-day maximum password lifetime restriction. Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. One method of minimizing this risk is to use complex passwords and periodically change them. 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.
SV-82161r1_rule AOSX-11-002060 CCI-000366 MEDIUM The system must be integrated into a directory services infrastructure. Distinct user account databases on each separate system cause problems with username and password policy enforcement. Most approved directory services infrastructure solutions allow centralized management of users and passwords.
SV-82163r2_rule AOSX-11-002055 CCI-000366 MEDIUM All users must use PKI authentication for login and privileged access. Password-based authentication has become a prime target for malicious actors. Multifactor authentication using PKI technologies mitigates most, if not all, risks associated with traditional password use. (Use of username and password for last-resort emergency access to a system for maintenance is acceptable, however.)
SV-82165r1_rule AOSX-11-002050 CCI-000381 LOW AirDrop must be disabled. 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. AirDrop must be disabled.
SV-82167r1_rule AOSX-11-000722 CCI-001133 MEDIUM The SSH daemon LoginGraceTime must be set correctly. SSH should be configured to log users out after a 15 minute interval of inactivity and to only wait 30 seconds before timing out login attempts. 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 or an incomplete login attempt will also free up resources committed by the managed network element.
SV-82169r1_rule AOSX-11-000750 CCI-002450 MEDIUM The operating system must issue or obtain public key certificates under an appropriate certificate policy from an approved service provider. DoD-approved certificates must be installed to the System Keychain so that they will be available to all users. For user certificates, each organization attains certificates from an approved, shared service provider, as required by OMB policy. For federal agencies operating a legacy public key infrastructure cross-certified with the Federal Bridge Certification Authority at medium assurance or higher, this Certification Authority will suffice. This control focuses on certificates with a visibility external to the information system and does not include certificates related to internal system operations, for example, application-specific time services.
SV-82171r1_rule AOSX-11-000780 CCI-001199 MEDIUM The operating system must implement cryptographic mechanisms to protect the confidentiality and integrity of all information at rest. 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) within an organizational information system. Mobile devices, laptops, desktops, and storage devices can be either lost or stolen, and the contents of their data storage (e.g., hard drives and non-volatile memory) can be read, copied, or altered. By encrypting the system hard drive, the confidentiality and integrity of any data stored on the system is ensured. FileVault Disk Encryption mitigates this risk. Satisfies: SRG-OS-000185-GPOS-00079, SRG-OS-000404-GPOS-00183, SRG-OS-000405-GPOS-00184
SV-82177r1_rule AOSX-11-000835 CCI-001233 MEDIUM The operating system must 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). An approved tool for continuous network scanning must be installed and configured to run. 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.
SV-82179r1_rule AOSX-11-000850 CCI-000366 MEDIUM The operating system must restrict the ability of individuals to use USB storage devices. External hard drives, such as USB, must be disabled for users. USB hard drives are a potential vector for malware and can be used to exfiltrate sensitive data, if an approved data-loss prevention (DLP) solution is not installed.
SV-82181r1_rule AOSX-11-000862 CCI-000366 MEDIUM The usbmuxd daemon must be disabled. Connections to unauthorized iOS devices (iPhones, iPods, and iPads) open the system to possible compromise via exfiltration of system data. Disabling the usbmuxd daemon blocks connections to iOS devices.
SV-82183r1_rule AOSX-11-001326 CCI-002238 MEDIUM The operating system must automatically lock the account until the locked account is released by an administrator when three unsuccessful logon attempts in 15 minutes are exceeded. 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. Setting a lockout expiration of 15 minutes is an effective deterrent against brute forcing that also makes allowances for legitimate mistakes by users.
SV-82185r1_rule AOSX-11-001355 CCI-000140 MEDIUM The operating system must shut down by default upon audit failure (unless availability is an overriding concern). The audit service should shut down the computer if it is unable to audit system events. Once audit failure occurs, user and system activity is no longer recorded and malicious activity could go undetected. 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: (i) 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. (ii) 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.
SV-82187r1_rule AOSX-11-000925 CCI-000366 MEDIUM The operating system must not allow an unattended or automatic logon to the system. When automatic logins are enabled, the default user account is automatically logged in at boot time without prompting the user for a password. Even if the screen is later locked, a malicious user would be able to reboot the computer in order to log in. Disabling automatic logins mitigates this risk.
SV-82189r1_rule AOSX-11-000930 CCI-000366 MEDIUM The login window must be configured to prompt for username and password, rather than show a list of users. The login window must be configured to prompt all users for both a username and a password. By default, the system displays a list of known users at the login screen. This gives an advantage to an attacker with physical access to the system, as the attacker would only have to guess the password for one of the listed accounts.
SV-82191r1_rule AOSX-11-000950 CCI-000366 MEDIUM The OS X firewall must have logging enabled. Firewall logging must be enabled. This ensures that malicious network activity will be logged to the system.
SV-82193r1_rule AOSX-11-000955 CCI-000366 MEDIUM Bluetooth devices must not be allowed to wake the computer. Bluetooth devices must not be allowed to wake the computer. If Bluetooth is not required, turn it off. If Bluetooth is necessary, disable allowing Bluetooth devices to wake the computer.
SV-82195r1_rule AOSX-11-000965 CCI-000366 MEDIUM Bluetooth Sharing must be disabled. Bluetooth sharing allows users to wirelessly transmit files between the OS X and Bluetooth-enabled devices, including personally owned cell phones and tablets. A malicious user might introduce viruses or malware onto the system or extract sensitive files. Disabling Bluetooth Sharing mitigates this risk.
SV-82197r1_rule AOSX-11-000975 CCI-000382 MEDIUM Remote Apple Events must be disabled. 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 cannot be disabled. Remote Apple Events must be disabled.
SV-82199r1_rule AOSX-11-000995 CCI-000366 HIGH The sudoers file must be configured to authenticate users on a per-tty basis. The sudo command must be configured to prompt for the administrator user's password at least once in each newly opened Terminal window or remote login session, as this prevents a malicious user from taking advantage of an unlocked computer or an abandoned login session to bypass the normal password prompt requirement. Without the tty_tickets option, all open local and remote logon sessions would be authenticated to use sudo without a password for the duration of the configured password timeout window.
SV-82201r1_rule AOSX-11-001080 CCI-000366 MEDIUM The application firewall must be enabled. The Application Firewall is the built-in firewall that comes with the OS X and must be enabled. 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.
SV-82203r1_rule AOSX-11-001110 CCI-000366 MEDIUM All public directories must be owned by root or an application account. All public directories must be owned by root, the local admin user, or an application account. Directory owners have permission to delete any files contained in that directory, even if the files are owned by other user accounts. By setting the owner to an administrator or application account, regular users will not be permitted to delete each other's files.
SV-82205r1_rule AOSX-11-001115 CCI-000366 MEDIUM The finger service must be disabled. The finger service has had several security vulnerabilities in the past and is not a necessary service. It is disabled by default; enabling it would increase the attack surface of the system.
SV-82207r1_rule AOSX-11-001120 CCI-000366 MEDIUM The sticky bit must be set on all public directories. The sticky bit must be set on all public directories, as it prevents users with write access to the directory from deleting or renaming files that belong to other users inside it.
SV-82209r1_rule AOSX-11-001125 CCI-000366 MEDIUM The prompt for Apple ID and iCloud must be disabled. The prompt for Apple ID and iCloud must be disabled, as it might mislead new users into creating unwanted Apple IDs and iCloud storage accounts upon their first log on.
SV-82211r1_rule AOSX-11-001130 CCI-000366 MEDIUM Users must not have Apple IDs signed into iCloud. Users should not sign into iCloud, as this leads to the possibility that sensitive data could be saved to iCloud storage or that users could inadvertently introduce viruses or malware previously saved to iCloud from other systems.
SV-82213r1_rule AOSX-11-001140 CCI-000366 LOW iTunes Music Sharing must be disabled. When iTunes Music Sharing is enabled, the computer starts a network listening service that shares the contents of the user's music collection with other users in the same subnet. Unnecessary network services should always be disabled because they increase the attack surface of the system. Disabling iTunes Music Sharing mitigates this risk.
SV-82215r1_rule AOSX-11-001145 CCI-000366 MEDIUM All setuid executables on the system must be vendor-supplied. Very few of the executables that come preinstalled on the OS X have the setuid bit set, and administrators should never add the setuid bit to any executable that does not already have it set by the vendor. Executables with the setuid bit set allow anyone that executes them to be temporarily assigned the UID of the file owner. In practice, this almost always is the root account. While some vendors depend on this file attribute for proper operation, security problems can result if setuid is assigned to programs allowing reading and writing of files, or shell escapes, as this could lead to unprivileged users gaining privileged access to files and directories on the system.
SV-82217r1_rule AOSX-11-001195 CCI-000366 MEDIUM The system must not accept source-routed IPv4 packets. A source-routed packet attempts to specify the network path the packet should take. If the system is not configured to block the incoming source-routed packets, an attacker can redirect the system's network traffic. Configuring the system to drop incoming source-routed IPv4 packets mitigates this risk.
SV-82219r1_rule AOSX-11-001200 CCI-000366 MEDIUM The system must ignore IPv4 ICMP redirect messages. ICMP redirects are broadcast in order to reshape network traffic. A malicious user could craft fake redirect packets and try to force all network traffic to pass through a network sniffer. If the system is not configured to ignore these packets, it could be susceptible to this kind of attack.
SV-82221r1_rule AOSX-11-001205 CCI-000366 MEDIUM IP forwarding for IPv4 must not be enabled. IP forwarding for IPv4 must not be enabled, as only authorized systems should be permitted to operate as routers.
SV-82223r1_rule AOSX-11-001206 CCI-000366 MEDIUM IP forwarding for IPv6 must not be enabled. IP forwarding for IPv6 must not be enabled, as only authorized systems should be permitted to operate as routers.
SV-82225r1_rule AOSX-11-001325 CCI-000044 MEDIUM The operating system must enforce account lockout after the limit of three consecutive invalid logon attempts by a user during a 15 minute time period. 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.
SV-82227r1_rule AOSX-11-001324 CCI-002238 MEDIUM The operating system must enforce an account lockout time period of 15 minutes in which three consecutive invalid logon attempts by a user are made. Setting a lockout time period of 15 minutes is an effective deterrent against brute forcing that also makes allowances for legitimate mistakes by users. When three invalid logon attempts are made, the account will be locked.
SV-82229r1_rule AOSX-11-001275 CCI-000381 MEDIUM Web Sharing must be disabled. Web Sharing is non-essential and must be disabled. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.
SV-82231r2_rule AOSX-11-001270 CCI-000381 MEDIUM Internet Sharing must be disabled. 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. Internet Sharing must be disabled.
SV-82235r1_rule AOSX-11-001210 CCI-000366 MEDIUM The system must not send IPv4 ICMP redirects by default. ICMP redirects are broadcast in order to reshape network traffic. A malicious user could use the system to send fake redirect packets and try to force all network traffic to pass through a network sniffer. Disabling ICMP redirect broadcasts mitigates this risk.
SV-82237r1_rule AOSX-11-001211 CCI-000366 MEDIUM The system must not send IPv6 ICMP redirects by default. ICMP redirects are broadcast in order to reshape network traffic. A malicious user could use the system to send fake redirect packets and try to force all network traffic to pass through a network sniffer. Disabling ICMP redirect broadcasts mitigates this risk.
SV-82239r1_rule AOSX-11-001215 CCI-000366 MEDIUM The system must prevent local applications from generating source-routed packets. A source-routed packet attempts to specify the network path that the system should take. If the system is not configured to block the sending of source-routed packets, an attacker can redirect the system's network traffic.
SV-82241r1_rule AOSX-11-001465 CCI-000366 HIGH The operating system must employ automated mechanisms to detect the presence of unauthorized software on organizational information systems and notify designated organizational officials in accordance with the organization-defined frequency. An approved anti-virus product must be installed and configured to run. Malicious software can establish a base on individual desktops and servers. Employing an automated mechanism to detect this type of software will aid in elimination of the software from the operating system.
SV-82243r1_rule AOSX-11-001220 CCI-000366 MEDIUM The system must not process Internet Control Message Protocol [ICMP] timestamp requests. ICMP Timestamp requests reveal information about the system and can be used to determine which operating system is installed. Precise time data can also be used to launch time based attacks against the system. Configuring the system to drop incoming ICMPv4 timestamp requests mitigates these risks.
SV-82245r1_rule AOSX-11-001235 CCI-000366 MEDIUM Unused network devices must be disabled. If an unused network device is left enabled, a user might be able to activate it at a later time. Unused network devices should be disabled.
SV-82645r1_rule AOSX-11-002130 CCI-000172 MEDIUM The operating system must generate audit records when successful/unsuccessful attempts to access/modify/delete objects, access/modify categories of information (e.g., classification levels), and delete privileges occur. 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). Satisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209, SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00211, SRG-OS-000468-GPOS-00212, SRG-OS-000474-GPOS-00219
SV-93765r1_rule AOSX-11-000606 CCI-000197 HIGH The OS X system must not use unencrypted FTP.