All shell files must not have extended ACLs.

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-38098r1_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

Open a terminal session and enter the following command to view extended ACLs. cat /etc/shells | xargs -n1 ls -lL If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix text

Open a terminal session and use the following command to remove the extended ACLs. chmod -N

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