RHEL-09-432035 - RHEL 9 must restrict the use of the "su" command.

Information

The "su" program allows to run commands with a substitute user and group ID. It is commonly used to run commands as the root user. Limiting access to such commands is considered a good security practice.

Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000312-GPOS-00123

Solution

Configure RHEL 9 to require users to be in the "wheel" group to run "su" command.

In file "/etc/pam.d/su", uncomment the following line:

"#auth required pam_wheel.so use_uid"

$ sed '/^[[:space:]]*#[[:space:]]*auth[[:space:]]\+required[[:space:]]\+pam_wheel\.so[[:space:]]\+use_uid$/s/^[[:space:]]*#//' -i /etc/pam.d/su

If necessary, create a "wheel" group and add administrative users to the group.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_9_V2R3_STIG.zip

Item Details

Category: ACCESS CONTROL, IDENTIFICATION AND AUTHENTICATION

References: 800-53|AC-3(4), 800-53|IA-11, CAT|II, CCI|CCI-002038, CCI|CCI-002165, CCI|CCI-004895, Rule-ID|SV-258088r1050789_rule, STIG-ID|RHEL-09-432035, Vuln-ID|V-258088

Plugin: Unix

Control ID: 7310b23770abd0006b34d63074ba7eddd6a7af2a3681c0743d2f6439f8febd90