The Network File System (NFS) exports configuration file must not have an extended ACL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22493	GEN005770	SV-37947r1_rule	ECLP-1	Low

Description
File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the NFS export configuration file could allow unauthorized modification of the file, which could result in Denial of Service to authorized NFS exports and the creation of additional unauthorized exports.

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

Details

Check Text ( C-37232r1_chk )
Check the permissions of the NFS export configuration file. # ls -lL /etc/exports 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-32439r1_fix)
Remove the extended ACL from the file. # setfacl --remove-all /etc/exports