The /etc/shadow file must not have an extended ACL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22340	GEN001430	SV-25987r1_rule	ECLP-1	Medium

Description
The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. The file also contains password hashes which must not be accessible to users other than root.

STIG	Date
UNIX SRG	2013-03-26

Details

Check Text ( C-27512r1_chk )
Verify /etc/shadow has no extended ACL. # ls -lL /etc/shadow If the permissions include a '+', the file has an extended ACL, this is a finding. If the /etc/shadow file does not exist and the system is in Trusted Mode, this is not a finding. Verify Trusted Mode: # ls -lLR /tcb/files/auth/ The TCB file(s) should exist and should not have an extended ACL.

Fix Text (F-26193r1_fix)
Remove the extended ACL from the /etc/shadow file.