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Red Hat Enterprise Linux 9 Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000479-GPOS-00224

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must have the rsyslog package installed.

    &lt;VulnDiscussion&gt;rsyslogd is a system utility providing support for message logging. Support for both internet and Unix domain sockets enables...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • The rsyslog service on RHEL 9 must be active.

    &lt;VulnDiscussion&gt;The "rsyslog" service must be running to provide logging services, which are essential to system administration.&lt;/VulnDisc...
    Rule Medium Severity
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  • RHEL 9 must be configured so that the rsyslog daemon does not accept log messages from other servers unless the server is being used for log aggregation.

    &lt;VulnDiscussion&gt;Unintentionally running a rsyslog server accepting remote messages puts the system at increased risk. Malicious rsyslog messa...
    Rule Medium Severity
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  • SRG-OS-000032-GPOS-00013

    <GroupDescription></GroupDescription>
    Group
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  • All RHEL 9 remote access methods must be monitored.

    &lt;VulnDiscussion&gt;Logging remote access methods can be used to trace the decrease in the risks associated with remote user access management. I...
    Rule Medium Severity
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  • SRG-OS-000342-GPOS-00133

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must be configured to offload audit records onto a different system from the system being audited via syslog.

    &lt;VulnDiscussion&gt;The auditd service does not include the ability to send audit records to a centralized server for management directly. Howeve...
    Rule Medium Severity
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  • SRG-OS-000342-GPOS-00133

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must authenticate the remote logging server for offloading audit logs via rsyslog.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Offloading is a common ...
    Rule Medium Severity
    Show

  • SRG-OS-000342-GPOS-00133

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must encrypt the transfer of audit records offloaded onto a different system or media from the system being audited via rsyslog.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Offloading is a common ...
    Rule Medium Severity
    Show

  • SRG-OS-000342-GPOS-00133

    <GroupDescription></GroupDescription>
    Group
    Show

  • RHEL 9 must encrypt via the gtls driver the transfer of audit records offloaded onto a different system or media from the system being audited via rsyslog.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Offloading is a common ...
    Rule Medium Severity
    Show

  • SRG-OS-000479-GPOS-00224

    <GroupDescription></GroupDescription>
    Group
    Show

  • RHEL 9 must be configured to forward audit records via TCP to a different system or media from the system being audited via rsyslog.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Offloading is a common ...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must use cron logging.

    &lt;VulnDiscussion&gt;Cron logging can be used to trace the successful or unsuccessful execution of cron jobs. It can also be used to spot intrusio...
    Rule Medium Severity
    Show

  • SRG-OS-000062-GPOS-00031

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 audit package must be installed.

    &lt;VulnDiscussion&gt;Without establishing what type of events occurred, the source of events, where events occurred, and the outcome of events, it...
    Rule Medium Severity
    Show

  • SRG-OS-000062-GPOS-00031

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 audit service must be enabled.

    &lt;VulnDiscussion&gt;Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events ...
    Rule Medium Severity
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  • RHEL 9 must take action when allocated audit record storage volume reaches 95 percent of the repository maximum audit record storage capacity.

    &lt;VulnDiscussion&gt;If action is not taken when storage volume reaches 95 percent utilization, the auditing system may fail when the storage volu...
    Rule Medium Severity
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  • RHEL 9 audit system must take appropriate action when an error writing to the audit storage volume occurs.

    &lt;VulnDiscussion&gt;It is critical that when the operating system is at risk of failing to process audit logs as required, it takes action to mit...
    Rule Medium Severity
    Show

  • SRG-OS-000047-GPOS-00023

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 audit system must take appropriate action when the audit storage volume is full.

    &lt;VulnDiscussion&gt;It is critical that when the operating system is at risk of failing to process audit logs as required, it takes action to mit...
    Rule Medium Severity
    Show

  • SRG-OS-000341-GPOS-00132

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must allocate audit record storage capacity to store at least one week's worth of audit records.

    &lt;VulnDiscussion&gt;To ensure RHEL 9 systems have a sufficient storage capacity in which to write the audit logs, RHEL 9 needs to be able to allo...
    Rule Medium Severity
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  • SRG-OS-000343-GPOS-00134

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must take action when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity.

    &lt;VulnDiscussion&gt;If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to pla...
    Rule Medium Severity
    Show

  • SRG-OS-000343-GPOS-00134

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must notify the system administrator (SA) and information system security officer (ISSO) (at a minimum) when allocated audit record storage volume 75 percent utilization.

    &lt;VulnDiscussion&gt;If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to pla...
    Rule Medium Severity
    Show

  • SRG-OS-000343-GPOS-00134

    <GroupDescription></GroupDescription>
    Group
    Show

  • RHEL 9 must take action when allocated audit record storage volume reaches 95 percent of the audit record storage capacity.

    &lt;VulnDiscussion&gt;If action is not taken when storage volume reaches 95 percent utilization, the auditing system may fail when the storage volu...
    Rule Medium Severity
    Show

  • SRG-OS-000343-GPOS-00134

    <GroupDescription></GroupDescription>
    Group
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  • SRG-OS-000047-GPOS-00023

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 audit log directory must be owned by root to prevent unauthorized read access.

    &lt;VulnDiscussion&gt;Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confide...
    Rule Medium Severity
    Show

  • SRG-OS-000057-GPOS-00027

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 audit system must take appropriate action when the audit files have reached maximum size.

    &lt;VulnDiscussion&gt;It is critical that when the operating system is at risk of failing to process audit logs as required, it takes action to mit...
    Rule Medium Severity
    Show

  • SRG-OS-000039-GPOS-00017

    <GroupDescription></GroupDescription>
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  • RHEL 9 must label all offloaded audit logs before sending them to the central log server.

    &lt;VulnDiscussion&gt;Enriched logging is needed to determine who, what, and when events occur on a system. Without this, determining root cause of...
    Rule Medium Severity
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  • SRG-OS-000342-GPOS-00133

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must take appropriate action when the internal event queue is full.

    &lt;VulnDiscussion&gt;The audit system should have an action setup in the event the internal event queue becomes full so that no data is lost. Inf...
    Rule Medium Severity
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  • SRG-OS-000046-GPOS-00022

    <GroupDescription></GroupDescription>
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  • RHEL 9 System Administrator (SA) and/or information system security officer (ISSO) (at a minimum) must be alerted of an audit processing failure event.

    &lt;VulnDiscussion&gt;It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required....
    Rule Medium Severity
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  • SRG-OS-000062-GPOS-00031

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 audit system must audit local events.

    &lt;VulnDiscussion&gt;Without establishing what type of events occurred, the source of events, where events occurred, and the outcome of events, it...
    Rule Medium Severity
    Show

  • SRG-OS-000057-GPOS-00027

    <GroupDescription></GroupDescription>
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  • RHEL 9 audit logs must be group-owned by root or by a restricted logging group to prevent unauthorized read access.

    &lt;VulnDiscussion&gt;Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confide...
    Rule Medium Severity
    Show

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