Title

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

Check /etc/security/login.cfg for a shells stanza. Procedure: # grep -p usw: /etc/security/login.cfg | grep "shells =" If no such stanza exists, this is a finding. Check the /etc/shells file. Procedure: # more /etc/shells If the /etc/shells file does not exist, this is a finding.

Fix Text

Edit the /etc/security/login.cfg file and add a shells stanza containing a list of valid shells. #chsec -f /etc/security/login.cfg -s usw -a shells=<list of approved shells> Create the /etc/shells file. #vi /etc/shells

Additional Identifiers

Rule ID: SV-38741r1_rule

Vulnerability ID: V-916

Group Title: GEN002120

Expert Comments

CCIs tied to check.

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