Ensure root is the only UID 0 account

보통레벨 1자동linux

설명

On a Linux system, the user ID (UID) 0 is the superuser identity: the kernel grants any account assigned UID 0 complete, unrestricted control of the host, regardless of the account's name. The root account holds UID 0 by default.

점검 방법

감사 방식: 셸 명령

shell

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

예상 출력: compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

1. Run the following command to reassign any account other than root that has UID 0 to a new, unused UID (and update ownership of that account's files): # usermod -u <NEW_UID> <username> Example: # usermod -u 1234 bsmith 2. If the root account's UID is not 0, run the following command to reset it: # usermod -u 0 root

속성

운영 체제: rhel-9
태그: cis-convertedlinux
참고 자료: CIS Red Hat Enterprise Linux 9 Benchmark v3.0.0 - 5.4.2.1

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shell

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