Ensure root is the only UID 0 account

MediumLevel 1Automatedlinux

Description

Any account with UID 0 has superuser privileges on the system.

How it is checked

Audit method: Shell command

shell

alt0() { command -v awk >/dev/null 2>&1 || { echo "step1: awk not installed"; return 1; }; command -v cat >/dev/null 2>&1 || { echo "step1: cat not installed"; return 1; }; o=$(bash -c 'cat /etc/passwd | awk -F: '"'"'($3 == 0) { print $1 }'"'"'' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- root || { echo step1: missing root; return 1; }; }; if alt0; then echo compliant; fi

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Remove any users other than root with UID 0 or assign them a new UID if appropriate.

Properties

Operating systems: alinux-2
Tags: cis-convertedlinux
Reference: CIS Aliyun Linux 2 Benchmark v1.0.0 ARCHIVE - 6.2.5

Check this host

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

shell

tmaegis scan --target linux