Web Server Security Requirements Guide

The Web Server SRG is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the 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: V2R3

Published: 2019-03-20

Updated At: 2019-05-03 21:27:43

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    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-53018r3_rule SRG-APP-000001-WSR-000001 CCI-000054 MEDIUM The web server must limit the number of allowed simultaneous session requests. Web server management includes the ability to control the number of users and user sessions that utilize a web server. Limiting the number of allowed users and sessions per user is helpful in limiting risks related to several types of Denial of Service at
    SV-53023r3_rule SRG-APP-000001-WSR-000002 CCI-000054 MEDIUM The web server must perform server-side session management. Session management is the practice of protecting the bulk of the user authorization and identity information. Storing of this data can occur on the client system or on the server. When the session information is stored on the client, the session ID, alo
    SV-53035r3_rule SRG-APP-000016-WSR-000005 CCI-000067 MEDIUM The web server must generate information to be used by external applications or entities to monitor and control remote access. Remote access to the web server is any access that communicates through an external, non-organization-controlled network. Remote access can be used to access hosted applications or to perform management functions. By providing remote access information
    SV-53037r3_rule SRG-APP-000014-WSR-000006 CCI-000068 MEDIUM The web server must use encryption strength in accordance with the categorization of data hosted by the web server when remote connections are provided. The web server has several remote communications channels. Examples are user requests via http/https, communication to a backend database, or communication to authenticate users. The encryption used to communicate must match the data that is being retriev
    SV-53068r3_rule SRG-APP-000015-WSR-000014 CCI-001453 MEDIUM The web server must use cryptography to protect the integrity of remote sessions. Data exchanged between the user and the web server can range from static display data to credentials used to log into the hosted application. Even when data appears to be static, the non-displayed logic in a web page may expose business logic or trusted s
    SV-54177r3_rule SRG-APP-000089-WSR-000047 CCI-000169 MEDIUM The web server must generate, at a minimum, log records for system startup and shutdown, system access, and system authentication events. Log records can be generated from various components within the web server (e.g., httpd, plug-ins to external backends, etc.). From a web server perspective, certain specific web server functionalities may be logged as well. The web server must allow the
    SV-54186r3_rule SRG-APP-000093-WSR-000053 CCI-001462 MEDIUM The web server must capture, record, and log all content related to a user session. A user session to a web server is in the context of a user accessing a hosted application that extends to any plug-ins/modules and services that may execute on behalf of the user. The web server must be capable of enabling a setting for troubleshooting,
    SV-54188r3_rule SRG-APP-000092-WSR-000055 CCI-001464 MEDIUM The web server must initiate session logging upon start up. An attacker can compromise a web server during the startup process. If logging is not initiated until all the web server processes are started, key information may be missed and not available during a forensic investigation. To assure all logable events a
    SV-54189r3_rule SRG-APP-000095-WSR-000056 CCI-000130 MEDIUM The web server must produce log records containing sufficient information to establish what type of events occurred. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the correct type of event that occurred is important during forensic
    SV-54190r3_rule SRG-APP-000096-WSR-000057 CCI-000131 MEDIUM The web server must produce log records containing sufficient information to establish when (date and time) events occurred. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the correct order of the events that occurred is important during fo
    SV-54191r3_rule SRG-APP-000097-WSR-000058 CCI-000132 MEDIUM The web server must produce log records containing sufficient information to establish where within the web server the events occurred. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the correct location or process within the web server where the even
    SV-54192r3_rule SRG-APP-000098-WSR-000059 CCI-000133 MEDIUM The web server must produce log records containing sufficient information to establish the source of events. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the correct source, e.g. source IP, of the events is important durin
    SV-54193r3_rule SRG-APP-000098-WSR-000060 CCI-000133 MEDIUM A web server, behind a load balancer or proxy server, must produce log records containing the client IP information as the source and destination and not the load balancer or proxy IP information with each event. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the correct source, e.g. source IP, of the events is important durin
    SV-54194r3_rule SRG-APP-000099-WSR-000061 CCI-000134 MEDIUM The web server must produce log records that contain sufficient information to establish the outcome (success or failure) of events. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Ascertaining the success or failure of an event is important during forensic anal
    SV-54197r3_rule SRG-APP-000100-WSR-000064 CCI-001487 MEDIUM The web server must produce log records containing sufficient information to establish the identity of any user/subject or process associated with an event. Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined. Determining user accounts, processes running on behalf of the user, and running pr
    SV-54245r3_rule SRG-APP-000116-WSR-000066 CCI-000159 MEDIUM The web server must use the internal system clock to generate time stamps for log records. 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 the web server is critica
    SV-54247r3_rule SRG-APP-000118-WSR-000068 CCI-000162 MEDIUM Web server log files must only be accessible by privileged users. Log data is essential in the investigation of events. If log data were to become compromised, then competent forensic analysis and discovery of the true source of potentially malicious system activity would be difficult, if not impossible, to achieve. In
    SV-54248r3_rule SRG-APP-000119-WSR-000069 CCI-000163 MEDIUM The log information from the web server must be protected from unauthorized modification. Log data is essential in the investigation of events. The accuracy of the information is always pertinent. Information that is not accurate does not help in the revealing of potential security risks and may hinder the early discovery of a system compromis
    SV-54249r3_rule SRG-APP-000120-WSR-000070 CCI-000164 MEDIUM The log information from the web server must be protected from unauthorized deletion. Log data is essential in the investigation of events. The accuracy of the information is always pertinent. Information that is not accurate does not help in the revealing of potential security risks and may hinder the early discovery of a system compromis
    SV-54251r3_rule SRG-APP-000125-WSR-000071 CCI-001348 MEDIUM The log data and records from the web server must be backed up onto a different system or media. Protection of log data includes assuring log data is not accidentally lost or deleted. Backing up log records to an unrelated system or onto separate media than the system the web server is actually running on helps to assure that, in the event of a catas
    SV-54261r3_rule SRG-APP-000131-WSR-000073 CCI-001749 MEDIUM Expansion modules must be fully reviewed, tested, and signed before they can exist on a production web server. In the case of a production web server, areas for content development and testing will not exist, as this type of content is only permissible on a development website. The process of developing on a functional production website entails a degree of trial
    SV-54270r3_rule SRG-APP-000141-WSR-000075 CCI-000381 MEDIUM The web server must only contain services and functions necessary for operation. A web server can provide many features, services, and processes. Some of these may be deemed unnecessary or too unsecure to run on a production DoD system. The web server must provide the capability to disable, uninstall, or deactivate functionality and
    SV-54271r3_rule SRG-APP-000141-WSR-000076 CCI-000381 MEDIUM The web server must not be a proxy server. A web server should be primarily a web server or a proxy server but not both, for the same reasons that other multi-use servers are not recommended. Scanning for web servers that will also proxy requests into an otherwise protected network is a very comm
    SV-54272r3_rule SRG-APP-000141-WSR-000077 CCI-000381 MEDIUM The web server must provide install options to exclude the installation of documentation, sample code, example applications, and tutorials. Web server documentation, sample code, example applications, and tutorials may be an exploitable threat to a web server because this type of code has not been evaluated and approved. A production web server must only contain components that are operationa
    SV-54273r3_rule SRG-APP-000141-WSR-000078 CCI-000381 MEDIUM Web server accounts not utilized by installed features (i.e., tools, utilities, specific services, etc.) must not be created and must be deleted when the web server feature is uninstalled. When accounts used for web server features such as documentation, sample code, example applications, tutorials, utilities, and services are created even though the feature is not installed, they become an exploitable threat to a web server. These accoun
    SV-54275r3_rule SRG-APP-000141-WSR-000080 CCI-000381 MEDIUM The web server must provide install options to exclude installation of utility programs, services, plug-ins, and modules not necessary for operation. Just as running unneeded services and protocols is a danger to the web server at the lower levels of the OSI model, running unneeded utilities and programs is also a danger at the application layer of the OSI model. Office suites, development tools, and g
    SV-54276r3_rule SRG-APP-000141-WSR-000081 CCI-000381 MEDIUM The web server must have Multipurpose Internet Mail Extensions (MIME) that invoke OS shell programs disabled. Controlling what a user of a hosted application can access is part of the security posture of the web server. Any time a user can access more functionality than is needed for the operation of the hosted application poses a security issue. A user with too
    SV-54277r3_rule SRG-APP-000141-WSR-000082 CCI-000381 MEDIUM The web server must allow the mappings to unused and vulnerable scripts to be removed. Scripts allow server side processing on behalf of the hosted application user or as processes needed in the implementation of hosted applications. Removing scripts not needed for application operation or deemed vulnerable helps to secure the web server.
    SV-54278r3_rule SRG-APP-000141-WSR-000083 CCI-000381 MEDIUM The web server must have resource mappings set to disable the serving of certain file types. Resource mapping is the process of tying a particular file type to a process in the web server that can serve that type of file to a requesting client and to identify which file types are not to be delivered to a client. By not specifying which files can
    SV-54279r3_rule SRG-APP-000141-WSR-000085 CCI-000381 MEDIUM The web server must have Web Distributed Authoring (WebDAV) disabled. A web server can be installed with functionality that, just by its nature, is not secure. Web Distributed Authoring (WebDAV) is an extension to the HTTP protocol that, when developed, was meant to allow users to create, change, and move documents on a ser
    SV-54280r3_rule SRG-APP-000141-WSR-000086 CCI-000381 MEDIUM The web server must protect system resources and privileged operations from hosted applications. A web server may host one too many applications. Each application will need certain system resources and privileged operations to operate correctly. The web server must be configured to contain and control the applications and protect the system resourc
    SV-54281r3_rule SRG-APP-000141-WSR-000087 CCI-000381 MEDIUM Users and scripts running on behalf of users must be contained to the document root or home directory tree of the web server. A web server is designed to deliver content and execute scripts or applications on the request of a client or user. Containing user requests to files in the directory tree of the hosted web application and limiting the execution of scripts and applicatio
    SV-54283r3_rule SRG-APP-000142-WSR-000089 CCI-000382 MEDIUM The web server must be configured to use a specified IP address and port. The web server must be configured to listen on a specified IP address and port. Without specifying an IP address and port for the web server to utilize, the web server will listen on all IP addresses available to the hosting server. If the web server ha
    SV-54307r3_rule SRG-APP-000175-WSR-000095 CCI-000185 MEDIUM The web server must perform RFC 5280-compliant certification path validation. A certificate's certification path is the path from the end entity certificate to a trusted root certification authority (CA). Certification path validation is necessary for a relying party to make an informed decision regarding acceptance of an end entit
    SV-54308r3_rule SRG-APP-000176-WSR-000096 CCI-000186 MEDIUM Only authenticated system administrators or the designated PKI Sponsor for the web server must have access to the web servers private key. The web server's private key is used to prove the identity of the server to clients and securely exchange the shared secret key used to encrypt communications between the web server and clients. By gaining access to the private key, an attacker can prete
    SV-54315r3_rule SRG-APP-000172-WSR-000104 CCI-000197 MEDIUM The web server must encrypt passwords during transmission. Data used to authenticate, especially passwords, needs to be protected at all times, and encryption is the standard method for protecting authentication data during transmission. Data used to authenticate can be passed to and from the web server for many
    SV-54322r3_rule SRG-APP-000179-WSR-000110 CCI-000803 MEDIUM The web server must use cryptographic modules that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance when encrypting stored data. Encryption is only as good as the encryption modules utilized. Unapproved cryptographic module algorithms cannot be verified, and cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised due to weak algorithms. FIP
    SV-54323r3_rule SRG-APP-000179-WSR-000111 CCI-000803 MEDIUM The web server must use cryptographic modules that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication. Encryption is only as good as the encryption modules utilized. Unapproved cryptographic module algorithms cannot be verified and cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised due to weak algorithms. FIPS
    SV-54371r3_rule SRG-APP-000211-WSR-000129 CCI-001082 MEDIUM The web server must separate the hosted applications from hosted web server management functionality. The separation of user functionality from web server management can be accomplished by moving management functions to a separate IP address or port. To further separate the management functions, separate authentication methods and certificates should be
    SV-54384r3_rule SRG-APP-000224-WSR-000136 CCI-001188 MEDIUM The web server must generate unique session identifiers that cannot be reliably reproduced. Communication between a client and the web server is done using the HTTP protocol, but HTTP is a stateless protocol. In order to maintain a connection or session, a web server will generate a session identifier (ID) for each client session when the sessio
    SV-54385r3_rule SRG-APP-000224-WSR-000137 CCI-001188 MEDIUM The web server must generate a session ID long enough that it cannot be guessed through brute force. Generating a session identifier (ID) that is not easily guessed through brute force is essential to deter several types of session attacks. By knowing the session ID, an attacker can hijack a user session that has already been user authenticated by the h
    SV-54386r3_rule SRG-APP-000224-WSR-000138 CCI-001188 MEDIUM The web server must generate a session ID using as much of the character set as possible to reduce the risk of brute force. Generating a session identifier (ID) that is not easily guessed through brute force is essential to deter several types of session attacks. By knowing the session ID, an attacker can hijack a user session that has already been user-authenticated by the ho
    SV-54387r3_rule SRG-APP-000224-WSR-000139 CCI-001188 MEDIUM The web server must generate unique session identifiers with definable entropy. Generating a session identifier (ID) that is not easily guessed through brute force is essential to deter several types of session attacks. By knowing the session ID, an attacker can hijack a user session that has already been user authenticated by the ho
    SV-54388r3_rule SRG-APP-000225-WSR-000140 CCI-001190 MEDIUM The web server must be built to fail to a known safe state if system initialization fails, shutdown fails, or aborts fail. Determining a safe state for failure and weighing that against a potential DoS for users depends on what type of application the web server is hosting. For an application presenting publicly available information that is not critical, a safe state for fai
    SV-54389r3_rule SRG-APP-000225-WSR-000141 CCI-001190 MEDIUM The web server must provide a clustering capability. The web server may host applications that display information that cannot be disrupted, such as information that is time-critical or life-threatening. In these cases, a web server that shuts down or ceases to be accessible when there is a failure is not a
    SV-54392r3_rule SRG-APP-000231-WSR-000144 CCI-001199 MEDIUM Information at rest must be encrypted using a DoD-accepted algorithm to protect the confidentiality and integrity of the information. Data at rest is inactive data which is stored physically in any digital form (e.g., databases, data warehouses, spreadsheets, archives, tapes, off-site backups, mobile devices, etc.). Data at rest includes, but is not limited to, archived data, data which
    SV-54395r3_rule SRG-APP-000223-WSR-000145 CCI-001664 MEDIUM The web server must accept only system-generated session identifiers. Communication between a client and the web server is done using the HTTP protocol, but HTTP is a stateless protocol. In order to maintain a connection or session, a web server will generate a session identifier (ID) for each client session when the sessio
    SV-54398r3_rule SRG-APP-000233-WSR-000146 CCI-001084 MEDIUM The web server document directory must be in a separate partition from the web servers system files. A web server is used to deliver content on the request of a client. The content delivered to a client must be controlled, allowing only hosted application files to be accessed and delivered. To allow a client access to system files of any type is a major
    SV-54410r3_rule SRG-APP-000246-WSR-000149 CCI-001094 MEDIUM The web server must restrict the ability of users to launch Denial of Service (DoS) attacks against other information systems or networks. A web server can limit the ability of the web server being used in a DoS attack through several methods. The methods employed will depend upon the hosted applications and their resource needs for proper operation. An example setting that could be used t
    SV-54429r3_rule SRG-APP-000251-WSR-000157 CCI-001310 MEDIUM The web server must limit the character set used for data entry. Invalid user input occurs when a user inserts data or characters into a hosted application's data entry field and the hosted application is unprepared to process that data. This results in unanticipated application behavior, potentially leading to an appl
    SV-54431r3_rule SRG-APP-000266-WSR-000159 CCI-001312 MEDIUM Warning and error messages displayed to clients must be modified to minimize the identity of the web server, patches, loaded modules, and directory paths. Information needed by an attacker to begin looking for possible vulnerabilities in a web server includes any information about the web server, backend systems being accessed, and plug-ins or modules being used. Web servers will often display error messa
    SV-54432r3_rule SRG-APP-000266-WSR-000160 CCI-001312 MEDIUM Debugging and trace information used to diagnose the web server must be disabled. Information needed by an attacker to begin looking for possible vulnerabilities in a web server includes any information about the web server and plug-ins or modules being used. When debugging or trace information is enabled in a production web server, in
    SV-70199r2_rule SRG-APP-000033-WSR-000169 CCI-000213 MEDIUM The web server must enforce approved authorizations for logical access to hosted applications and resources in accordance with applicable access control policies. To control access to sensitive information and hosted applications by entities that have been issued certificates by DoD-approved PKIs, the web server must be properly configured to incorporate a means of authorization that does not simply rely on the pos
    SV-70201r2_rule SRG-APP-000340-WSR-000029 CCI-002235 MEDIUM Non-privileged accounts on the hosting system must only access web server security-relevant information and functions through a distinct administrative account. By separating web server security functions from non-privileged users, roles can be developed that can then be used to administer the web server. Forcing users to change from a non-privileged account to a privileged account when operating on the web serve
    SV-70203r2_rule SRG-APP-000295-WSR-000134 CCI-002361 MEDIUM The web server must set an inactive timeout for sessions. Leaving sessions open indefinitely is a major security risk. An attacker can easily use an already authenticated session to access the hosted application as the previously authenticated user. By closing sessions after a set period of inactivity, the web s
    SV-70205r2_rule SRG-APP-000295-WSR-000012 CCI-002361 MEDIUM The web server must set an absolute timeout for sessions. Leaving sessions open indefinitely is a major security risk. An attacker can easily use an already authenticated session to access the hosted application as the previously authenticated user. By closing sessions after an absolute period of time, the user
    SV-70207r2_rule SRG-APP-000315-WSR-000003 CCI-002314 MEDIUM Remote access to the web server must follow access policy or work in conjunction with enterprise tools designed to enforce policy requirements. Remote access to the web server is any access that communicates through an external, non-organization-controlled network. Remote access can be used to access hosted applications or to perform management functions. A web server can be accessed remotely an
    SV-70209r2_rule SRG-APP-000316-WSR-000170 CCI-002322 MEDIUM The web server must provide the capability to immediately disconnect or disable remote access to the hosted applications. During an attack on the web server or any of the hosted applications, the system administrator may need to disconnect or disable access by users to stop the attack. The web server must provide a capability to disconnect users to a hosted application wit
    SV-70211r2_rule SRG-APP-000356-WSR-000007 CCI-001844 MEDIUM A web server that is part of a web server cluster must route all remote management through a centrally managed access control point. A web server cluster is a group of independent web servers that are managed as a single system for higher availability, easier manageability, and greater scalability. Without having centralized control of the web server cluster, management of the cluster
    SV-70213r2_rule SRG-APP-000357-WSR-000150 CCI-001849 MEDIUM The web server must use a logging mechanism that is configured to allocate log record storage capacity large enough to accommodate the logging requirements of the web server. In order to make certain that the logging mechanism used by the web server has sufficient storage capacity in which to write the logs, the logging mechanism needs to be able to allocate log record storage capacity. The task of allocating log record stor
    SV-70215r2_rule SRG-APP-000315-WSR-000004 CCI-002314 MEDIUM The web server must restrict inbound connections from nonsecure zones. Remote access to the web server is any access that communicates through an external, non-organization-controlled network. Remote access can be used to access hosted applications or to perform management functions. A web server can be accessed remotely an
    SV-70223r2_rule SRG-APP-000358-WSR-000063 CCI-001851 MEDIUM The web server must not impede the ability to write specified log record content to an audit log server. Writing events to a centralized management audit system offers many benefits to the enterprise over having dispersed logs. Centralized management of audit records and logs provides for efficiency in maintenance and management of records, enterprise analys
    SV-70225r2_rule SRG-APP-000358-WSR-000163 CCI-001851 MEDIUM The web server must be configurable to integrate with an organizations security infrastructure. A web server will typically utilize logging mechanisms for maintaining a historical log of activity that occurs within a hosted application. This information can then be used for diagnostic purposes, forensics purposes, or other purposes relevant to ensur
    SV-70227r2_rule SRG-APP-000108-WSR-000166 CCI-000139 MEDIUM The web server must use a logging mechanism that is configured to alert the ISSO and SA in the event of a processing failure. Reviewing log data allows an investigator to recreate the path of an attacker and to capture forensic data for later use. Log data is also essential to system administrators in their daily administrative duties on the hosted system or within the hosted ap
    SV-70229r2_rule SRG-APP-000359-WSR-000065 CCI-001855 MEDIUM The web server must use a logging mechanism that is configured to provide a warning to the ISSO and SA when allocated record storage volume reaches 75% of maximum log record storage capacity. It is critical for the appropriate personnel to be aware if a system is at risk of failing to process logs as required. Log processing failures include: software/hardware errors, failures in the log capturing mechanisms, and log storage capacity being rea
    SV-70231r2_rule SRG-APP-000375-WSR-000171 CCI-001889 MEDIUM The web server must record time stamps for log records to a minimum granularity of one second. Without sufficient granularity of time stamps, it is not possible to adequately determine the chronological order of records. Time stamps generated by the web server include date and time and must be to a granularity of one second.
    SV-70233r2_rule SRG-APP-000374-WSR-000172 CCI-001890 MEDIUM The web server must generate log records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT). If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analysis across multiple devices and log records. Time stamps generated by the web server include date and time. Time is commonly expre
    SV-70235r2_rule SRG-APP-000380-WSR-000072 CCI-001813 MEDIUM The web server application, libraries, and configuration files must only be accessible to privileged users. A web server can be modified through parameter modification, patch installation, upgrades to the web server or modules, and security parameter changes. With each of these changes, there is the potential for an adverse effect such as a DoS, web server inst
    SV-70237r2_rule SRG-APP-000131-WSR-000051 CCI-001749 MEDIUM All web server files must be verified for their integrity (e.g., checksums and hashes) before becoming part of the production web server. Being able to verify that a patch, upgrade, certificate, etc., being added to the web server is unchanged from the producer of the file is essential for file validation and non-repudiation of the information. The web server or hosting system must have a
    SV-70239r2_rule SRG-APP-000516-WSR-000174 CCI-000366 MEDIUM The web server must be configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs. Configuring the web server to implement organization-wide security implementation guides and security checklists guarantees compliance with federal standards and establishes a common security baseline across the DoD that reflects the most restrictive secu
    SV-70241r2_rule SRG-APP-000516-WSR-000079 CCI-000366 MEDIUM All accounts installed with the web server software and tools must have passwords assigned and default passwords changed. During installation of the web server software, accounts are created for the web server to operate properly. The accounts installed can have either no password installed or a default password, which will be known and documented by the vendor and the user
    SV-70243r2_rule SRG-APP-000141-WSR-000015 CCI-000381 MEDIUM The web server must not perform user management for hosted applications. User management and authentication can be an essential part of any application hosted by the web server. Along with authenticating users, the user management function must perform several other tasks like password complexity, locking users after a configu
    SV-70245r2_rule SRG-APP-000383-WSR-000175 CCI-001762 MEDIUM The web server must prohibit or restrict the use of nonsecure or unnecessary ports, protocols, modules, and/or services. Web servers provide numerous processes, features, and functionalities that utilize TCP/IP ports. Some of these processes may be deemed unnecessary or too unsecure to run on a production system. The web server must provide the capability to disable or de
    SV-70247r2_rule SRG-APP-000211-WSR-000031 CCI-001082 MEDIUM Anonymous user access to the web server application directories must be prohibited. In order to properly monitor the changes to the web server and the hosted applications, logging must be enabled. Along with logging being enabled, each record must properly contain the changes made and the names of those who made the changes. Allowing an
    SV-70249r2_rule SRG-APP-000211-WSR-000030 CCI-001082 MEDIUM Web server accounts accessing the directory tree, the shell, or other operating system functions and utilities must only be administrative accounts. As a rule, accounts on a web server are to be kept to a minimum. Only administrators, web managers, developers, auditors, and web authors require accounts on the machine hosting the web server. The resources to which these accounts have access must also b
    SV-70251r2_rule SRG-APP-000435-WSR-000148 CCI-002385 MEDIUM The web server must be tuned to handle the operational requirements of the hosted application. A Denial of Service (DoS) can occur when the web server is so overwhelmed that it can no longer respond to additional requests. A web server not properly tuned may become overwhelmed and cause a DoS condition even with expected traffic from users. To avoi
    SV-70253r2_rule SRG-APP-000435-WSR-000147 CCI-002385 MEDIUM The web server must be protected from being stopped by a non-privileged user. An attacker has at least two reasons to stop a web server. The first is to cause a DoS, and the second is to put in place changes the attacker made to the web server configuration. To prohibit an attacker from stopping the web server, the process ID (pi
    SV-70255r2_rule SRG-APP-000439-WSR-000151 CCI-002418 MEDIUM The web server must employ cryptographic mechanisms (TLS/DTLS/SSL) preventing the unauthorized disclosure of information during transmission. Preventing the disclosure of transmitted information requires that the web server take measures to employ some form of cryptographic mechanism in order to protect the information during transmission. This is usually achieved through the use of Transport L
    SV-70257r2_rule SRG-APP-000439-WSR-000152 CCI-002418 MEDIUM Web server session IDs must be sent to the client using SSL/TLS. The HTTP protocol is a stateless protocol. To maintain a session, a session identifier is used. The session identifier is a piece of data that is used to identify a session and a user. If the session identifier is compromised by an attacker, the session c
    SV-70259r2_rule SRG-APP-000439-WSR-000153 CCI-002418 MEDIUM Web server cookies, such as session cookies, sent to the client using SSL/TLS must not be compressed. A cookie is used when a web server needs to share data with the client's browser. The data is often used to remember the client when the client returns to the hosted application at a later date. A session cookie is a special type of cookie used to remembe
    SV-70261r2_rule SRG-APP-000439-WSR-000154 CCI-002418 MEDIUM Cookies exchanged between the web server and the client, such as session cookies, must have cookie properties set to prohibit client-side scripts from reading the cookie data. A cookie can be read by client-side scripts easily if cookie properties are not set properly. By allowing cookies to be read by the client-side scripts, information such as session identifiers could be compromised and used by an attacker who intercepts th
    SV-70263r2_rule SRG-APP-000439-WSR-000155 CCI-002418 MEDIUM Cookies exchanged between the web server and the client, such as session cookies, must have cookie properties set to force the encryption of cookies. Cookies can be sent to a client using TLS/SSL to encrypt the cookies, but TLS/SSL is not used by every hosted application since the data being displayed does not require the encryption of the transmission. To safeguard against cookies, especially session
    SV-70265r2_rule SRG-APP-000439-WSR-000156 CCI-002418 MEDIUM A web server must maintain the confidentiality of controlled information during transmission through the use of an approved TLS version. Transport Layer Security (TLS) is a required transmission protocol for a web server hosting controlled information. The use of TLS provides confidentiality of data in transit between the web server and client. FIPS 140-2 approved TLS versions must be enab
    SV-70267r2_rule SRG-APP-000441-WSR-000181 CCI-002420 MEDIUM The web server must maintain the confidentiality and integrity of information during preparation for transmission. Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, including, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures
    SV-70269r2_rule SRG-APP-000442-WSR-000182 CCI-002422 MEDIUM The web server must maintain the confidentiality and integrity of information during reception. 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 c
    SV-70271r2_rule SRG-APP-000416-WSR-000118 CCI-002450 MEDIUM The web server must implement required cryptographic protections using cryptographic modules complying with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance when encrypting data that must be compartmentalized. Cryptography is only as strong as the encryption modules/algorithms employed to encrypt the data. Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. NSA has developed Type 1 algorithms for pr
    SV-70273r2_rule SRG-APP-000206-WSR-000128 CCI-001166 MEDIUM A web server utilizing mobile code must meet DoD-defined mobile code requirements. Mobile code in hosted applications allows the developer to add functionality and displays to hosted applications that are fluid, as opposed to a static web page. The data presentation becomes more appealing to the user, is easier to analyze, and navigatio
    SV-70275r2_rule SRG-APP-000220-WSR-000201 CCI-001185 MEDIUM The web server must invalidate session identifiers upon hosted application user logout or other session termination. Captured sessions can be reused in "replay" attacks. This requirement limits the ability of adversaries from capturing and continuing to employ previously valid session IDs. Session IDs are tokens generated by web applications to uniquely identify an app
    SV-70277r2_rule SRG-APP-000224-WSR-000135 CCI-001188 MEDIUM The web server must generate a unique session identifier for each session using a FIPS 140-2 approved random number generator. Communication between a client and the web server is done using the HTTP protocol, but HTTP is a stateless protocol. In order to maintain a connection or session, a web server will generate a session identifier (ID) for each client session when the sessio
    SV-70279r2_rule SRG-APP-000223-WSR-000011 CCI-001664 MEDIUM Cookies exchanged between the web server and client, such as session cookies, must have security settings that disallow cookie access outside the originating web server and hosted application. Cookies are used to exchange data between the web server and the client. Cookies, such as a session cookie, may contain session information and user credentials used to maintain a persistent connection between the user and the hosted application since HTT
    SV-70281r2_rule SRG-APP-000427-WSR-000186 CCI-002470 MEDIUM The web server must only accept client certificates issued by DoD PKI or DoD-approved PKI Certification Authorities (CAs). Non-DoD approved PKIs have not been evaluated to ensure that they have security controls and identity vetting procedures in place which are sufficient for DoD systems to rely on the identity asserted in the certificate. PKIs lacking sufficient security co
    SV-70283r2_rule SRG-APP-000225-WSR-000074 CCI-001190 MEDIUM The web server must augment re-creation to a stable and known baseline. Making certain that the web server has not been updated by an unauthorized user is always a concern. Adding patches, functions, and modules that are untested and not part of the baseline opens the possibility for security risks. The web server must offer,
    SV-70285r2_rule SRG-APP-000429-WSR-000113 CCI-002476 MEDIUM The web server must encrypt user identifiers and passwords. When data is written to digital media, such as hard drives, mobile computers, external/removable hard drives, personal digital assistants, flash/thumb drives, etc., there is risk of data loss and data compromise. User identities and passwords stored on th
    SV-70287r3_rule SRG-APP-000456-WSR-000187 CCI-002605 MEDIUM The web server must install security-relevant software updates within the configured time period directed by an authoritative source (e.g., IAVM, CTOs, DTMs, and STIGs). Security flaws with software applications are discovered daily. Vendors are constantly updating and patching their products to address newly discovered security vulnerabilities. Organizations (including any contractor to the organization) are required to
    SV-70289r2_rule SRG-APP-000266-WSR-000142 CCI-001312 MEDIUM The web server must display a default hosted application web page, not a directory listing, when a requested web page cannot be found. The goal is to completely control the web user's experience in navigating any portion of the web document root directories. Ensuring all web content directories have at least the equivalent of an index.html file is a significant factor to accomplish this
    SV-75835r1_rule SRG-APP-000439-WSR-000188 CCI-002418 MEDIUM The web server must remove all export ciphers to protect the confidentiality and integrity of transmitted information. During the initial setup of a Transport Layer Security (TLS) connection to the web server, the client sends a list of supported cipher suites in order of preference. The web server will reply with the cipher suite it will use for communication from the c