high8.8
CVE-2021-22538
Privilege escalation in rbac
Impact
### Impact Using a carefully crafted request or malicious proxy, a user with `UserWrite` permissions could create another user with higher privileges than their own due to insufficient checks on the allowed set of permissions. The event would be captured in the Event Log. ### Patches The issue has been fixed in 0.24.0 and 0.23.1. ### Workarounds For users who are unable to upgrade, we recommend auditing users who have `UserWrite` permissions and regularly reviewing the Event Log for malicious activity. ### Kudos Thank you to Michael Mazzolini (Ethical Hacker at WHO) for finding and disclosing this vulnerability.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/google/exposure-notifications-verification-server | < 0.23.0 | 0.23.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Exposure Notifications Verification Server | before 0.23.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95
- https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1
- https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0
- https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6
- https://github.com/advisories/GHSA-5v95-v8c8-3rh6
- https://nvd.nist.gov/vuln/detail/CVE-2021-22538