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The alias file must not have an extended ACL.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22439 GEN004390 SV-45850r1_rule Medium
Description
Excessive permissions on the aliases file may permit unauthorized modification. If the alias file is modified by an unauthorized user, they may modify the file to run malicious code or redirect e-mail.
STIG Date
SUSE Linux Enterprise Server v11 for System z 2016-12-20

Details

Check Text ( C-43148r1_chk )
Check the permissions of the alias file.

Procedure:
for sendmail:
# ls -lL /etc/aliases /etc/aliases.db
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.

for postfix:
Verify the location of the alias file.
# postconf alias_maps

This will return the location of the "aliases" file.

# 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 (F-39234r1_fix)
Remove the extended permissions from the alias files.
Procedure:
for sendmail:
# setfacl --remove-all /etc/aliases /etc/aliases.db

for postfix:
# setfacl --remove-all