RHEL 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-258074	RHEL-09-412065	SV-258074r991590_rule		Medium

Description
Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2024-06-04

Details

Check Text ( C-61815r926207_chk )
Verify RHEL 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 "/etc/login.defs" file, the Severity is raised to a CAT I. # grep -i 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.

Check Text ( C-61815r926207_chk )

Verify RHEL 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 "/etc/login.defs" file, the Severity is raised to a CAT I.

# grep -i 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-61739r926208_fix)
Configure RHEL 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