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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-63697r1_rule 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
Oracle Linux 5 Security Technical Implementation Guide 2018-03-01

Details

Check Text ( C-52299r1_chk )
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 (F-54279r2_fix)
Change the group-owner of the shell to root, bin, sys, or system.

Procedure:
# chgrp root