RHEL 9 must define default permissions for the c shell.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-258073	RHEL-09-412060	SV-258073r926206_rule		Medium

Description

The umask controls the default access mode assigned to newly created files. A umask of 077 limits new files to mode 600 or less permissive. Although umask can be represented as a four-digit number, the first digit representing special access modes is typically ignored or required to be "0". This requirement applies to the globally configured system defaults and the local interactive user defaults for each account on the system. Satisfies: SRG-OS-000480-GPOS-00228, SRG-OS-000480-GPOS-00227

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-61814r926204_chk )

Verify the "umask" setting is configured correctly in the "/etc/csh.cshrc" file with the following command: Note: If the value of the "umask" parameter is set to "000" "/etc/csh.cshrc" file, the Severity is raised to a CAT I. $ grep umask /etc/csh.cshrc umask 077 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-61738r926205_fix)
Configure RHEL 9 to define default permissions for all authenticated users using the c shell. Add or edit the lines for the "umask" parameter in the "/etc/csh.cshrc" file to "077": umask 077