Title

The /etc/shells (or equivalent) file must exist. (Cat III impact)

Discussion

The shells file (or equivalent) lists approved default shells. It helps provide layered defense to the security approach by ensuring users cannot change their default shell to an unauthorized shell that may not be secure.

Check Content

Verify /etc/shells exists. # ls -l /etc/shells If the file does not exist, this is a finding.

Fix Text

Create a /etc/shells file containing a list of valid system shells.

Additional Identifiers

Rule ID:

Vulnerability ID: V-916

Group Title:

Expert Comments

CCIs tied to check.

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