The system and user default umask must be 077.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-808	GEN002560	SV-63801r1_rule		Medium

Description
The umask controls the default access mode assigned to newly created files. An umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a 4-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 user defaults for each account on the system.

Description

The umask controls the default access mode assigned to newly created files. An umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a 4-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 user defaults for each account on the system.

STIG	Date
Oracle Linux 5 Security Technical Implementation Guide	2020-02-25

Details

Check Text ( C-52349r1_chk )
NOTE: The following commands must be run in the BASH shell. Check global initialization files for the configured umask value. Procedure: # grep umask /etc/* Check local initialization files for the configured umask value. Procedure: # cut -d: -f6 /etc/passwd \|xargs -n1 -IDIR find DIR -name ".*" -type f -maxdepth 1 -exec grep umask {} \; If the system and user default umask is not 077, this a finding. Note: If the default umask is 000 or allows for the creation of world-writable files this becomes a Severity Code I finding.

Check Text ( C-52349r1_chk )

NOTE: The following commands must be run in the BASH shell.

Check global initialization files for the configured umask value.
Procedure:
# grep umask /etc/*

Check local initialization files for the configured umask value.
Procedure:
# cut -d: -f6 /etc/passwd |xargs -n1 -IDIR find DIR -name ".*" -type f -maxdepth 1 -exec grep umask {} \;

If the system and user default umask is not 077, this a finding.

Note: If the default umask is 000 or allows for the creation of world-writable files this becomes a Severity Code I finding.

Fix Text (F-54383r1_fix)
Edit local and global initialization files that contain "umask" and change them to use 077 instead of the current value.