All shell files must be group-owned by root, bin, sys, or system.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-63697r1_rule All shell files must be group-owned by root, bin, sys, or system.

Vulnerability discussion

If shell files are group-owned by users other than root or a system group, they could be modified by intruders or malicious users to perform unauthorized actions.

Check content

If /etc/shells exists, check the group ownership of each shell referenced. Procedure: # cat /etc/shells | xargs -n1 ls -l Otherwise, check any shells found on the system. Procedure: # find / -name "*sh" | xargs -n1 ls -l If a shell is not group-owned by root, bin, sys, or system, this is a finding.

Fix text

Change the group-owner of the shell to root, bin, sys, or system. Procedure: # chgrp root

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