The /etc/shadow file must not have an extended ACL.

From Oracle Linux 5 Security Technical Implementation Guide

Part of GEN001430

Associated with: CCI-000225

SV-64575r1_rule The /etc/shadow file must not have an extended ACL.

Vulnerability discussion

The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. The file also contains password hashes which must not be accessible to users other than root.

Check content

Verify /etc/shadow has no extended ACL. # ls -l /etc/shadow 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 /etc/shadow

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