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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22365	GEN002210	SV-38848r1_rule	ECLP-1	Medium

Description
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.

STIG	Date
Draft AIX Security Technical Implementation Guide	2011-08-17

Details

Check Text ( C-37180r1_chk )
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.

Check Text ( C-37180r1_chk )

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.

Fix Text (F-33104r1_fix)
Change the group owner of the shell to root, bin, sys, or system. # chgrp system < shell >