Red Hat Enterprise Linux 8 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-OS-000259-GPOS-00100
<GroupDescription></GroupDescription>Group -
RHEL 8 library directories must be group-owned by root or a system account.
<VulnDiscussion>If RHEL 8 were to allow any user to make changes to software libraries, then those changes might be implemented without under...Rule Medium Severity -
SRG-OS-000445-GPOS-00199
<GroupDescription></GroupDescription>Group -
The RHEL 8 operating system must use a file integrity tool to verify correct operation of all security functions.
<VulnDiscussion>Without verification of the security functions, security functions may not operate correctly, and the failure may go unnotice...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 8 must specify the default "include" directory for the /etc/sudoers file.
<VulnDiscussion>The "sudo" command allows authorized users to run programs (including shells) as other users, system users, and root. The "/e...Rule Medium Severity -
SRG-OS-000373-GPOS-00156
<GroupDescription></GroupDescription>Group -
The RHEL 8 operating system must not be configured to bypass password requirements for privilege escalation.
<VulnDiscussion>Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When opera...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 8 must ensure the password complexity module is enabled in the system-auth file.
<VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 8 systems below version 8.4 must ensure the password complexity module in the system-auth file is configured for three retries or less.
<VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 8 systems below version 8.4 must ensure the password complexity module in the password-auth file is configured for three retries or less.
<VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 8 systems, version 8.4 and above, must ensure the password complexity module is configured for three retries or less.
<VulnDiscussion>Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The graphical display manager must not be the default target on RHEL 8 unless approved.
<VulnDiscussion>Internet services that are not required for system or application processes must not be active to decrease the attack surface...Rule Medium Severity -
SRG-OS-000324-GPOS-00125
<GroupDescription></GroupDescription>Group -
RHEL 8 must prevent nonprivileged users from executing privileged functions, including disabling, circumventing, or altering implemented security safeguards/countermeasures.
<VulnDiscussion>Preventing nonprivileged users from executing privileged functions mitigates the risk that unauthorized individuals or proces...Rule Medium Severity -
SRG-OS-000250-GPOS-00093
<GroupDescription></GroupDescription>Group -
RHEL 8 SSH server must be configured to use only FIPS-validated key exchange algorithms.
<VulnDiscussion>Without cryptographic integrity protections provided by FIPS-validated cryptographic algorithms, information can be viewed an...Rule Medium Severity -
SRG-OS-000366-GPOS-00153
<GroupDescription></GroupDescription>Group -
RHEL 8 must ensure cryptographic verification of vendor software packages.
<VulnDiscussion>Cryptographic verification of vendor software packages ensures that all software packages are obtained from a valid source an...Rule Medium Severity -
SRG-OS-000363-GPOS-00150
<GroupDescription></GroupDescription>Group -
RHEL 8 must be configured to allow sending email notifications of unauthorized configuration changes to designated personnel.
<VulnDiscussion>Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized ...Rule Medium Severity -
SRG-OS-000163-GPOS-00072
<GroupDescription></GroupDescription>Group -
RHEL 8.7 and higher must terminate idle user sessions.
<VulnDiscussion>Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 8 must not allow blank or null passwords in the system-auth file.
<VulnDiscussion>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 -
The RHEL 8 SSH daemon must not allow authentication using known host’s authentication.
<VulnDiscussion>Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, ...Rule Medium Severity -
All RHEL 8 local interactive user home directories must be group-owned by the home directory owner’s primary group.
<VulnDiscussion>If the Group Identifier (GID) of a local interactive user’s home directory is not the same as the primary GID of the user, th...Rule Medium Severity
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