Title

The ftpusers file must not have an extended ACL. (Cat II impact)

Discussion

Excessive permissions on the ftpusers file could permit unauthorized modification. Unauthorized modification could result in Denial of Service to authorized FTP users or permit unauthorized users to access the FTP service.

Check Content

Check the permissions of the /etc/ftpd/ftpusers file. # ls -lL /etc/ftpd/ftpusers If the permissions include a "+", the file has an extended ACL and this is a finding.

Fix Text

Remove the extended ACL from the file. # chmod A- /etc/ftpd/ftpusers

Additional Identifiers

Rule ID: SV-227860r603266_rule

Vulnerability ID: V-227860

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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