cyberstrikeus 13.3 Verify No Legacy "+" Entries Exist in /etc/shadow File (Scored)
Profile Applicability
- Level 1
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 Procedure
Using Command Line
Run the following command and verify that no output is returned:
/bin/grep '^+:' /etc/shadow
Expected Result
No output should be returned. Any output indicates legacy + entries exist in /etc/shadow.
Remediation
Using Command Line
Delete these entries if they exist.
Default Value
No legacy + entries exist in /etc/shadow by default on Ubuntu 12.04.
References
- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
Profile
Level 1 - Scored