Check for Duplicate UIDs

MediumLevel 1Automatedsolaris

Description

Although the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually modify passwd and change the UID field. Users must be assigned unique UIDs for accountability and to ensure appropriate access protections. Audit: automated read-only check derived from the CIS audit procedure; it prints "compliant" when the control is met.

How it is checked

Audit method: Shell command

shell

command -v logins >/dev/null 2>&1 || exit 1; out=$( { logins -d ; } 2>/dev/null ); [ -z "$out" ] && echo compliant || printf '%s\n' "$out" | head -n 20

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Correct or justify any items discovered in the Audit step. Determine if there exists any users who share a common UID, and work with those users to determine the best course of action in accordance with site policy.

Properties

Operating systems: Any
Tags: solarisaccounts
Reference: CIS Oracle Solaris 11.4 Benchmark v1.1.0 - 9.16 Check for Duplicate UIDs

Check this host

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

shell

tmaegis scan --target solaris