SV-27071r1: All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file.

Description

Discussion Text

If a user is assigned the GID of a group that does not exist on the system, and a group with that GID is subsequently created, the user may have unintended rights to the group.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366

Additional Details

Responsibility

System Administrator

IA Controls

ECSC-1

References

DPMS Target AIX 6.1 DISA DPMS Target AIX 6.1 2176

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.fso.aix11:def:27
# All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# All GIDs in /etc/passwd must be defined in /etc/group
# password_object (password_test)
test_1() {
  [ "$(getent passwd '.*' | cut -d: -f4)" = "$(sed -En 's/^[^:]+:[^:]*:(-?[0-9]+):/\1/p' '/etc/group')" ]
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Remediation

Add a group to the system for each GID referenced without a corresponding group.  

# smitty mkgroup