EMAIL-022: Mail Forwarding Rule Enumeration
- Platform
- Google Workspace
- Category
- Advanced Threat Protection
- Severity
- High
- Zero Trust pillar
- Applications & Workloads (weight 1)
- Golden fixtures
- 3
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- baseline
What it checks
All user-level mail forwarding rules should be enumerated and reviewed. Attackers commonly set up forwarding rules to maintain persistent access to email after account compromise
Recommended value
No unauthorized forwarding rules; all forwarding rules documented and approved
Remediation
Enumerate forwarding rules via Gmail API for all users. Remove unauthorized forwarding addresses. Disable auto-forwarding at the OU level to prevent future abuse
Fixture-proven verdicts
Every verdict below is proven by a golden fixture in the module's gating test suite. This table derives from the last green run; it cannot be edited by hand.
| Scenario | Expected verdict |
|---|---|
| clean | PASS |
| known-bad | FAIL |
| throttled | Not Assessed |
Framework mappings
- NIST SP 800-53
- AC-4, SI-4, AU-6
- CIS Benchmark
- 2.22
- MITRE ATT&CK
- T1114.003, T1020