V-832

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 an alias file has a mode more permissive than 0644, 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 an alias file has a mode more permissive than 0644, this is a finding.