The file integrity tool must be configured to verify Access Control Lists (ACLs).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75519	UBTU-16-010520	SV-90199r3_rule		Low

Description
ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools.

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-75223r3_chk )
Verify the file integrity tool is configured to verify Access Control Lists (ACLs). Use the following command to determine if the file is in a location other than "/etc/aide/aide.conf": # find / -name aide.conf Check the "aide.conf" file to determine if the "acl" rule has been added to the rule list being applied to the files and directories selection lists with the following command: # egrep "[+]?acl" /etc/aide/aide.conf VarFile = OwnerMode+n+l+X+acl If the "acl" rule is not being used on all selection lines in the "/etc/aide.conf" file, is commented out, or ACLs are not being checked by another file integrity tool, this is a finding.

Check Text ( C-75223r3_chk )

Verify the file integrity tool is configured to verify Access Control Lists (ACLs).

Use the following command to determine if the file is in a location other than "/etc/aide/aide.conf":

# find / -name aide.conf

Check the "aide.conf" file to determine if the "acl" rule has been added to the rule list being applied to the files and directories selection lists with the following command:

# egrep "[+]?acl" /etc/aide/aide.conf

VarFile = OwnerMode+n+l+X+acl

If the "acl" rule is not being used on all selection lines in the "/etc/aide.conf" file, is commented out, or ACLs are not being checked by another file integrity tool, this is a finding.

Fix Text (F-82147r1_fix)
Configure the file integrity tool to check file and directory ACLs. If AIDE is installed, ensure the "acl" rule is present on all file and directory selection lists.