AlmaLinux OS 9 must define default permissions for all authenticated users in such a way that the user can only read and modify their own files.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269235 | ALMA-09-017620 | SV-269235r1050117_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-269235r1050117_chk)
Verify AlmaLinux OS 9 defines default permissions for all authenticated users in such a way that the user can only read and modify their own files with the following command:
Note: If the value of the "UMASK" parameter is set to "000" in the "/etc/login.defs" file, the severity is raised to a CAT I.
$ grep UMASK /etc/login.defs
UMASK 077
If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.
Fix Text (F-73167r1049351_fix)
Configure AlmaLinux OS 9 to define default permissions for all authenticated users in such a way that the user can only read and modify their own files.
Add or edit the lines for the "UMASK" parameter in the "/etc/login.defs" file to "077":
UMASK 077