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

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-38741r1_rule The /etc/shells (or equivalent) file must exist.

Vulnerability 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= Create the /etc/shells file. #vi /etc/shells

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