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V-22441

CAT II (Medium)

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

Rule ID

SV-45854r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000225

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 <file referenced from aliases>
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 <file referenced from aliases>