GTRADE-006: Persistent / Over-Scoped OAuth Grants
- Platform
- Google Workspace
- Category
- Adversary Tradecraft
- Severity
- High
- Zero Trust pillar
- Visibility & Analytics (weight 2)
- Golden fixtures
- 3
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- original
What it checks
Third-party OAuth grants holding full Gmail/Drive/admin scopes bypass MFA and survive a password reset (Apps Script, app passwords, and IMAP-OAuth sessions are not revoked by a reset) — a durable persistence channel. Google logs grants but ships no default malicious-grant classifier.
Recommended value
No third-party OAuth app holding full mail/drive/admin scopes; persistent grants reviewed and explicitly revoked
Remediation
Security > API controls > App access control: review apps with full Gmail/Drive/Directory scopes, restrict to allowlisted apps, and explicitly revoke unneeded grants (a password reset alone does NOT revoke OAuth, app-password, or Apps Script access).
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 |
| no-data | Not Assessed |
Framework mappings
- NIST SP 800-53
- AC-6, IA-5
- CIS Benchmark
- 1.x
- MITRE ATT&CK
- T1550.001, T1098.001