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RHEL-10-600500 RHEL 10 must restrict the use of the "su" command.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

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

Title

RHEL 10 must restrict the use of the "su" command.

Control

Verify RHEL 10 requires users to be members of the "wheel" group to run "su". Verify the configuration 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 is commented out, this is a finding.

Discussion

The "su" program allows commands to be run 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

Fix

Configure RHEL 10 to require users to be in the "wheel" group to run the "su" command. Edit the configuration file: $ sudo vi /etc/pam.d/su Add the following lines: 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.