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 of all accounts. # more /etc/passwd Confirm all accounts with a UID of 99 and below are used by a system account. If a UID reserved for system accounts (0 - 99) is used by a non-system account, this is a finding.

Fix Text

Change the UID numbers for non-system accounts with reserved UIDs (those less or equal to 99).

Additional Identifiers

Rule ID: SV-227571r603266_rule

Vulnerability ID: V-227571

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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