Ensure group root is the only GID 0 group

How it is checked

Audit method: Shell command

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

Expected output

compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Run the following command to set the root group's GID to 0: # groupmod -g 0 root Remove any groups other than the root group with GID 0 or assign them a new GID if appropriate.

Check this host

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

tmaegis scan --target linux