Title

Files executed through a mail aliases file must be group-owned by root, bin, or sys, and must reside within a directory group-owned by root, bin, or sys. (Cat II impact)

Discussion

If a file executed through a mail aliases file is not group-owned by root or a system group, it may be subject to unauthorized modification. Unauthorized modification of files executed through aliases may allow unauthorized users to attain root privileges.

Check Content

Examine the contents of the /etc/mail/aliases file. For each file referenced, check the group ownership of the file. Procedure: # ls -lL <file referenced from aliases> If the group owner of any file is not root, bin, or sys, this is a finding.

Fix Text

Change the group ownership of the file referenced from /etc/mail/aliases. Procedure: # chgrp root <file referenced from aliases>

Additional Identifiers

Rule ID: SV-227841r603266_rule

Vulnerability ID: V-227841

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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