From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE
Part of GEN002210
Associated with IA controls: ECLP-1
Associated with: CCI-000225
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 the group ownership of each shell referenced. Procedure: # cat /etc/shells | xargs -n1 ls -l If any shell is not group owned by root, bin, sys, or system, this is a finding. #grep shells /etc/security/login.cfg | grep -v \* | cut -f 2 -d = | sed s/,/\ /g | xargs -n1 ls -l If any shell is not group owned by root, bin, sys, or system, this is a finding. 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.
Change the group owner of the shell to root, bin, sys, or system. # chgrp system < shell >
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