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RHEL-10-400320 RHEL 10 must define default permissions for the c shell.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3 via CCI-000213

Title

RHEL 10 must define default permissions for the c shell.

Control

Verify the RHEL 10 "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" in the "/etc/csh.cshrc" file, the Severity is raised to a CAT I. $ sudo grep umask /etc/csh.cshrc 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.

Discussion

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.

Related controls

CCI-000213

Fix

Configure RHEL 10 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