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General Purpose Operating System Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The operating system must synchronize internal information system clocks to the authoritative time source when the time difference is greater than one second.

    <VulnDiscussion>Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the cor...
    Rule Medium Severity
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  • SRG-OS-000358

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must record time stamps for audit records that meet a minimum granularity of one second for a minimum degree of precision.

    &lt;VulnDiscussion&gt;Without sufficient granularity of time stamps, it is not possible to adequately determine the chronological order of records....
    Rule Medium Severity
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  • SRG-OS-000359

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must record time stamps for audit records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).

    &lt;VulnDiscussion&gt;If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analys...
    Rule Low Severity
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  • SRG-OS-000360

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must enforce dual authorization for movement and/or deletion of all audit information, when such movement or deletion is not part of an authorized automatic process.

    &lt;VulnDiscussion&gt;An authorized user may intentionally or accidentally move or delete audit records without those specific actions being author...
    Rule Medium Severity
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  • SRG-OS-000362

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must prohibit user installation of system software without explicit privileged status.

    &lt;VulnDiscussion&gt;Allowing regular users to install software, without explicit privileges, creates the risk that untested or potentially malici...
    Rule Medium Severity
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  • SRG-OS-000363

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must notify designated personnel if baseline configurations are changed in an unauthorized manner.

    &lt;VulnDiscussion&gt;Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized ...
    Rule Medium Severity
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  • SRG-OS-000364

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must enforce access restrictions.

    &lt;VulnDiscussion&gt;Failure to provide logical access restrictions associated with changes to system configuration may have significant effects o...
    Rule Medium Severity
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  • SRG-OS-000365

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must audit the enforcement actions used to restrict access associated with changes to the system.

    &lt;VulnDiscussion&gt;Without auditing the enforcement of access restrictions against changes to the application configuration, it will be difficul...
    Rule Medium Severity
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  • The operating system must prevent the installation of patches, service packs, device drivers, or operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization.

    &lt;VulnDiscussion&gt;Changes to any software components can have significant effects on the overall security of the operating system. This require...
    Rule High Severity
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  • SRG-OS-000368

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must prevent program execution in accordance with local policies regarding software program usage and restrictions and/or rules authorizing the terms and conditions of software program usage.

    &lt;VulnDiscussion&gt;Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may pr...
    Rule Medium Severity
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  • SRG-OS-000370

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs.

    &lt;VulnDiscussion&gt;Utilizing a whitelist provides a configuration management method for allowing the execution of only authorized software. Usin...
    Rule Medium Severity
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  • SRG-OS-000375

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must implement multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access.

    &lt;VulnDiscussion&gt;Using an authentication device, such as a common access card (CAC) or token that is separate from the information system, ens...
    Rule Medium Severity
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  • SRG-OS-000376

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must authenticate all endpoint devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.

    &lt;VulnDiscussion&gt;Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. B...
    Rule Medium Severity
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  • SRG-OS-000383

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must prohibit the use of cached authenticators after one day.

    &lt;VulnDiscussion&gt;If cached authentication information is out-of-date, the validity of the authentication information may be questionable.&lt;/...
    Rule Medium Severity
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  • SRG-OS-000384

    <GroupDescription></GroupDescription>
    Group
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  • The operating system, for PKI-based authentication, must implement a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network.

    &lt;VulnDiscussion&gt;Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer autho...
    Rule Medium Severity
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  • SRG-OS-000392

    <GroupDescription></GroupDescription>
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  • The operating system must audit all activities performed during nonlocal maintenance and diagnostic sessions.

    &lt;VulnDiscussion&gt;If events associated with nonlocal administrative access or diagnostic sessions are not logged, a major tool for assessing an...
    Rule Medium Severity
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  • SRG-OS-000393

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must only allow the use of DoD PKI-established certificate authorities for authentication in the establishment of protected sessions to the operating system.

    &lt;VulnDiscussion&gt;Untrusted Certificate Authorities (CA) can issue certificates, but they may be issued by organizations or individuals that se...
    Rule Medium Severity
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  • SRG-OS-000404

    <GroupDescription></GroupDescription>
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  • The operating system must implement cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.

    &lt;VulnDiscussion&gt;Privileged access contains control and configuration information and is particularly sensitive, so additional protections are...
    Rule High Severity
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  • SRG-OS-000394

    <GroupDescription></GroupDescription>
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  • The operating system must implement cryptographic mechanisms to protect the confidentiality of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.

    &lt;VulnDiscussion&gt;Privileged access contains control and configuration information and is particularly sensitive, so additional protections are...
    Rule High Severity
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  • SRG-OS-000395

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must verify remote disconnection at the termination of nonlocal maintenance and diagnostic sessions, when used for nonlocal maintenance sessions.

    &lt;VulnDiscussion&gt;If the remote connection is not closed and verified as closed, the session may remain open and be exploited by an attacker; t...
    Rule Medium Severity
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  • SRG-OS-000396

    <GroupDescription></GroupDescription>
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  • The operating system must implement NSA-approved cryptography to protect classified information in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating ...
    Rule High Severity
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  • SRG-OS-000403

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must implement cryptographic mechanisms to prevent unauthorized modification of all information at rest on all operating system components.

    &lt;VulnDiscussion&gt;Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthor...
    Rule High Severity
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  • SRG-OS-000405

    <GroupDescription></GroupDescription>
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  • The operating system must implement cryptographic mechanisms to prevent unauthorized disclosure of all information at rest on all operating system components.

    &lt;VulnDiscussion&gt;Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthor...
    Rule High Severity
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  • SRG-OS-000420

    <GroupDescription></GroupDescription>
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  • The operating system must protect against or limit the effects of Denial of Service (DoS) attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces.

    &lt;VulnDiscussion&gt;DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot ac...
    Rule Medium Severity
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  • SRG-OS-000423

    <GroupDescription></GroupDescription>
    Group
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  • The operating system must protect the confidentiality and integrity of transmitted information.

    &lt;VulnDiscussion&gt;Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected commu...
    Rule High Severity
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  • SRG-OS-000424

    <GroupDescription></GroupDescription>
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  • The operating system must implement cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a Protected Distribution System (PDS).

    &lt;VulnDiscussion&gt;Encrypting information for transmission protects information from unauthorized disclosure and modification. Cryptographic mec...
    Rule High Severity
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