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

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to AC-3(4), IA-11, SC-11 via CCI-004895, CCI-002165, CCI-002038

Title

RHEL 9 must restrict the use of the "su" command.

Control

Verify RHEL 9 includes users who require privilege escalation to be members of the "wheel" group with the following command: $ sudo grep pam_wheel /etc/pam.d/su auth required pam_wheel.so use_uid If a line for "pam_wheel.so" does not exist, or the line is commented out, this is a finding.

Discussion

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

Related controls

CCI-002038, CCI-002165, CCI-004895

Fix

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.