Files executed through a mail aliases file must not have extended ACLs.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-63745r1_rule Files executed through a mail aliases file must not have extended ACLs.

Vulnerability discussion

Excessive permissions on files executed through a mail aliases file could result in modification by an unauthorized user, execution of malicious code, and/or system compromise.

Check content

Examine the contents of the /etc/aliases file. Procedure: # more /etc/aliases Examine the aliases file for any utilized directories or paths. # ls -lL Check the permissions for any paths referenced. 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

Remove the extended ACL from the file. # setfacl --remove-all

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