RHEL 9 must restrict the use of the "su" command.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-258088 | SRG-OS-000373-GPOS-00156 | RHEL-09-432035 | SV-258088r1050789_rule | 2025-02-27 | 2 |
| Description |
|---|
| 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 |
| ℹ️ Check |
|---|
| Verify that RHEL 9 requires uses to be members of the "wheel" group with the following command: $ 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 |
|---|
| 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. |