Title

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

Discussion

ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools. TOSS installation media come with a file integrity tool, Advanced Intrusion Detection Environment (AIDE).

Check Content

Verify the file integrity tool is configured to verify ACLs. Note: AIDE is highly configurable at install time. This requirement assumes the "aide.conf" file is under the "/etc" directory. If AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. Use the following command to determine if the file is in a location other than "/etc/aide/aide.conf": $ sudo 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: $ sudo egrep "[+]?acl" /etc/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

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.

Additional Identifiers

Rule ID: SV-253104r991589_rule

Vulnerability ID: V-253104

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.