All shell files must not have extended ACLs.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-38744r1_rule All shell files must not have extended ACLs.

Vulnerability discussion

Shells with world/group write permissions give the ability to maliciously modify the shell to obtain unauthorized access.

Check content

Check the permissions of each shell referenced in /etc/shells. Procedure: # cat /etc/shells For each shell listed, run aclget #aclget Check the permissions of each shell referenced in /etc/security/login.cfg. Procedure: #grep shells /etc/security/login.cfg For each shell listed, run aclget # aclget Otherwise, check any shells found on the system. # find / -name "*sh #aclget / If extended permissions are enabled on any shell, this is a finding.

Fix text

Remove the extended ACL from the shell file(s) and disable extended permissions. #acledit /

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