Ensure no duplicate UIDs exist

MediumLevel 1Automatedazure-container-linux

Description

Although the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually edit the /etc/passwd file and change the UID field. Audit: Passes when no value of field 3 in /etc/passwd appears more than once.

How it is checked

Audit method: Shell command

shell

cut -d: -f3 /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 UIDs and review all files owned by the shared UIDs to determine which UID they are supposed to belong to.

Properties

Operating systems: Any
Tags: azure-container-linuxaccounts
Reference: CIS Azure Container Linux Benchmark v1.0.0 - 7.2.4 Ensure no duplicate UIDs 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