V-22439

Discussion

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.

Check Content

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 <postfix aliases file> <postfix aliases.db file>
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.