Title

UIDs reserved for system accounts must not be assigned to non-system accounts. (Cat II impact)

Discussion

Reserved UIDs are typically used by system software packages. If non-system accounts have UIDs in this range, they may conflict with system software, possibly leading to the user having permissions to modify system files.

Check Content

Check the UID assignments for all accounts. # awk -F: '$3 <= 499 {printf "%15s:%4s\n", $1, $3}' /etc/passwd | sort -n -t: -k2 Confirm all accounts with a UID of 499 and below are used by a system account. If a UID reserved for system accounts (0 - 499) is used by a non-system account, then this is a finding.

Fix Text

Change the UID numbers for non-system accounts with reserved UIDs (those less or equal to 499).

Additional Identifiers

Rule ID: SV-44825r1_rule

Vulnerability ID: V-11946

Group Title: GEN000340

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.