Vulnerability Discussion

If the "/etc/passwd" file is writable by a group-owner or the world the risk of its compromise is increased. The file contains the list of accounts on the system and associated information, and protection of this file is critical for system security.

Check

Verify that the "/etc/passwd" file has mode "0644" or less permissive with the following command:

$ sudo stat -c "%a %n" /etc/passwd

644 /etc/passwd

If a value of "0644" or less permissive is not returned, this is a finding.

Fix

Change the mode of the file "/etc/passwd" to "0644" by running the following command:

$ sudo chmod 0644 /etc/passwd