GIDs reserved for system accounts must not be assigned to non-system groups.

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-28658r1_rule GIDs reserved for system accounts must not be assigned to non-system groups.

Vulnerability discussion

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

Check content

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

Fix text

Change the primary group GID numbers for non-system accounts with reserved primary group GIDs (those less or equal to 99). # usermod -g

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