Ensure no duplicate user names exist

MediumLevel 1Automatedazure-container-linux

Description

Although the useradd program will not let you create a duplicate user name, it is possible for an administrator to manually edit the /etc/passwd file and change the user name. Audit: Passes when no value of field 1 in /etc/passwd appears more than once.

How it is checked

Audit method: Shell command

shell

cut -d: -f1 /etc/passwd | sort | uniq -d | grep -q . && echo noncompliant || echo compliant

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Based on the results of the audit script, establish unique user names for the users. File ownerships will automatically reflect the change as long as the users have unique UIDs.

Properties

Operating systems: Any
Tags: azure-container-linuxaccounts
Reference: CIS Azure Container Linux Benchmark v1.0.0 - 7.2.6 Ensure no duplicate user names exist

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target azure-container-linux