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Check: GEN002210

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN002210 (in versions v1 r14 through v1 r10)

Title

All shell files must be group-owned by root, bin, sys, or system. (Cat II impact)

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

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

Change the group owner of the shell to root, bin, sys, or system. # chgrp system < shell >

Additional Identifiers

Rule ID: SV-38848r1_rule

Vulnerability ID: V-22365

Group Title: GEN002210

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000225	The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions.

Controls

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

Number	Title
AC-6	Least Privilege