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Red Hat Enterprise Linux 9 Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must not forward IPv6 source-routed packets by default.

    &lt;VulnDiscussion&gt;Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...
    Rule Medium Severity
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  • SRG-OS-000423-GPOS-00187

    <GroupDescription></GroupDescription>
    Group
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  • All RHEL 9 networked systems must have SSH installed.

    &lt;VulnDiscussion&gt;Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected commu...
    Rule Medium Severity
    Show

  • SRG-OS-000423-GPOS-00187

    <GroupDescription></GroupDescription>
    Group
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  • All RHEL 9 networked systems must have and implement SSH to protect the confidentiality and integrity of transmitted and received information, as well as information during preparation for transmission.

    &lt;VulnDiscussion&gt;Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected commu...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must have the openssh-clients package installed.

    &lt;VulnDiscussion&gt;This package includes utilities to make encrypted connections and transfer files securely to SSH servers.&lt;/VulnDiscussion&...
    Rule Medium Severity
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  • SRG-OS-000023-GPOS-00006

    <GroupDescription></GroupDescription>
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  • RHEL 9 must display the Standard Mandatory DOD Notice and Consent Banner before granting local or remote access to the system via a SSH logon.

    &lt;VulnDiscussion&gt;The warning message reinforces policy awareness during the logon process and facilitates possible legal action against attack...
    Rule Medium Severity
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  • SRG-OS-000032-GPOS-00013

    <GroupDescription></GroupDescription>
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  • RHEL 9 must log SSH connection attempts and failures to the server.

    &lt;VulnDiscussion&gt;SSH provides several logging levels with varying amounts of verbosity. "DEBUG" is specifically not recommended other than str...
    Rule Medium Severity
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  • SRG-OS-000105-GPOS-00052

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSHD must accept public key authentication.

    &lt;VulnDiscussion&gt;Without the use of multifactor authentication, the ease of access to privileged functions is greatly increased. Multifactor a...
    Rule Medium Severity
    Show

  • SRG-OS-000106-GPOS-00053

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSHD must not allow blank passwords.

    &lt;VulnDiscussion&gt;If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with ...
    Rule High Severity
    Show

  • SRG-OS-000109-GPOS-00056

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must not permit direct logons to the root account using remote access via SSH.

    &lt;VulnDiscussion&gt;Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of...
    Rule Medium Severity
    Show

  • SRG-OS-000125-GPOS-00065

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must enable the Pluggable Authentication Module (PAM) interface for SSHD.

    &lt;VulnDiscussion&gt;When UsePAM is set to "yes", PAM runs through account and session types properly. This is important when restricted access to...
    Rule High Severity
    Show

  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSH daemon must be configured to use system-wide crypto policies.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
    Show

  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must implement DOD-approved encryption ciphers to protect the confidentiality of SSH client connections.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
    Show

  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must implement DOD-approved encryption ciphers to protect the confidentiality of SSH server connections.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
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  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSH client must be configured to use only Message Authentication Codes (MACs) employing FIPS 140-3 validated cryptographic hash algorithms.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
    Show

  • SRG-OS-000250-GPOS-00093

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSH server must be configured to use only Message Authentication Codes (MACs) employing FIPS 140-3 validated cryptographic hash algorithms.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00229

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must not allow a noncertificate trusted host SSH logon to the system.

    &lt;VulnDiscussion&gt;SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts.&lt;/VulnDiscuss...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00229

    <GroupDescription></GroupDescription>
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  • RHEL 9 must not allow users to override SSH environment variables.

    &lt;VulnDiscussion&gt;SSH environment options potentially allow users to bypass access restriction in some configurations.&lt;/VulnDiscussion&gt;&l...
    Rule Medium Severity
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  • SRG-OS-000423-GPOS-00187

    <GroupDescription></GroupDescription>
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  • RHEL 9 must force a frequent session key renegotiation for SSH connections to the server.

    &lt;VulnDiscussion&gt;Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected commu...
    Rule Medium Severity
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  • SRG-OS-000163-GPOS-00072

    <GroupDescription></GroupDescription>
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  • RHEL 9 must be configured so that all network connections associated with SSH traffic terminate after becoming unresponsive.

    &lt;VulnDiscussion&gt;Terminating an unresponsive SSH session within a short time period reduces the window of opportunity for unauthorized personn...
    Rule Medium Severity
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  • SRG-OS-000126-GPOS-00066

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 must be configured so that all network connections associated with SSH traffic are terminated after 10 minutes of becoming unresponsive.

    &lt;VulnDiscussion&gt;Terminating an unresponsive SSH session within a short time period reduces the window of opportunity for unauthorized personn...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSH server configuration file must be group-owned by root.

    &lt;VulnDiscussion&gt;Service configuration files enable or disable features of their respective services, which if configured incorrectly, can lea...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSH server configuration file must be owned by root.

    &lt;VulnDiscussion&gt;Service configuration files enable or disable features of their respective services, which if configured incorrectly, can lea...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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  • RHEL 9 SSH server configuration file must have mode 0600 or less permissive.

    &lt;VulnDiscussion&gt;Service configuration files enable or disable features of their respective services that if configured incorrectly can lead t...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • RHEL 9 SSH private host key files must have mode 0640 or less permissive.

    &lt;VulnDiscussion&gt;If an unauthorized user obtains the private SSH host key file, the host could be impersonated.&lt;/VulnDiscussion&gt;&lt;Fals...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • RHEL 9 SSH public host key files must have mode 0644 or less permissive.

    &lt;VulnDiscussion&gt;If a public host key file is modified by an unauthorized user, the SSH service may be compromised.&lt;/VulnDiscussion&gt;&lt;...
    Rule Medium Severity
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