AlmaLinux OS 9 must define default permissions for PAM users.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269236 | ALMA-09-017730 | SV-269236r1050118_rule | CCI-000366 | medium |
| Description | ||||
| Setting the most restrictive default permissions ensures that when new accounts are created they do not have unnecessary access. With a UMASK of 077, files will be created with 0600 permissions (owner read/write only) and directories will have 0700 permissions (owner read/write/execute only). | ||||
| STIG | Date | |||
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 | |||
Details
Check Text (C-269236r1050118_chk)
Verify that the "pam_umask" module is enabled with the following command:
$ grep -i umask /etc/pam.d/*
/etc/pam.d/postlogin:session optional pam_umask.so silent umask=0022
If a "pam_umask.so" line is not returned, this is a finding.
If the "umask" setting is set to anything other than "0077", this is a finding.
Note: If the "umask" setting is not found, it will use the default UMASK entry in /etc/login.defs.
Fix Text (F-73168r1049353_fix)
Configure AlmaLinux OS 9 to define default permissions for all authenticated users so the user can only read and modify their own files.
Add or edit the following line at the top of /etc/pam.d/postlogin:
session optional pam_umask.so silent