Title

System log files must not have extended ACLs, except as needed to support authorized software. (Cat II impact)

Discussion

If the system log files are not protected, unauthorized users could change the logged data, eliminating its forensic value. Authorized software may be given log file access through the use of extended ACLs when needed and configured to provide the least privileges required.

Check Content

Verify system log files have no extended ACLs. Procedure: # ls -lL /var/log If the permissions include a '+', the file has an extended ACL. If an extended ACL exists, verify with the SA if the ACL is required to support authorized software and provides the minimum necessary permissions. If an extended ACL exists providing access beyond the needs of authorized software, this is a finding.

Fix Text

Remove the extended ACL from the file. Procedure: # setfacl --remove-all [file with extended ACL]

Additional Identifiers

Rule ID: SV-44948r1_rule

Vulnerability ID: V-22315

Group Title: GEN001270

Expert Comments

CCIs tied to check.

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