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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22334	GEN001390	SV-37346r1_rule	ECLP-1	Medium

Description
File system ACLs can provide access to files beyond what is allowed by the mode numbers of the files. The /etc/passwd file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2017-03-01

Details

Check Text ( C-36038r1_chk )
Verify /etc/passwd has no extended ACL. # ls -l /etc/passwd If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text (F-23614r1_fix)
Remove the extended ACL from the file. # setfacl --remove-all /etc/passwd