AlmaLinux OS 9 must restrict the use of the "su" command.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269363 | ALMA-09-032470 | SV-269363r1050246_rule | CCI-004045 | medium |
| Description | ||||
| The "su" program provides a "switch user" capability. It is commonly used to become root but can be used to switch to any user. Limiting access to such commands is considered a good security practice. Satisfies: SRG-OS-000109-GPOS-00056, SRG-OS-000312-GPOS-00124, SRG-OS-000312-GPOS-00122, SRG-OS-000312-GPOS-00123 | ||||
| STIG | Date | |||
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 | |||
Details
Check Text (C-269363r1050246_chk)
Verify that AlmaLinux OS 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 Text (F-73295r1049554_fix)
Configure AlmaLinux OS 9 to require users to be in the "wheel" group to run "su" command.
In the "/etc/pam.d/su" file, uncomment the "pam_wheel.so" line as per the instructions in the file:
# Uncomment the following line to require a user to be in the "wheel" group.
#auth required pam_wheel.so use_uid
If necessary, create a "wheel" group and add administrative users to the group.