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V-281205

CAT II (Medium)

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

Rule ID

SV-281205r1166567_rule

STIG

Red Hat Enterprise Linux 10 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-002038 CCI-002165

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

Check Content

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.

Fix Text

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.