6.2.3 Ensure no legacy "+" entries exist in /etc/shadow (Scored)
Profile Applicability
Level 1 - Server Level 1 - Workstation
Description
The character + in various files used to be markers for systems to insert data from NIS maps at a certain point in a system configuration file. These entries are no longer required on most systems, but may exist in files that have been imported from other platforms.
Rationale
These entries may provide an avenue for attackers to gain privileged access on the system.
Audit
Run the following command and verify that no output is returned:
# grep '^+:' /etc/shadow
Remediation
Remove any legacy '+' entries from /etc/shadow if they exist.