Vulnerability · Published Mar 31, 2021 · Assigned by Google
CVE-2021-22538Privilege escalation in RBAC system
Medium 6.3
In plain English
A medium-severity improper input validation in Exposure Notifications Verification Server from Google LLC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/google/exposure-notifications-verification-server | 0.23.1 | GHSA-5v95-v8c8-3rh6 |
| Go | github.com/google/exposure-notifications-verification-server | 0.23.1 | GO-2022-0798 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Google LLC | Exposure Notifications Verification Server | stable – through 0.23.0 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
References
- https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6 x_refsource_CONFIRM
- https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95 x_refsource_CONFIRM
- https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1 x_refsource_CONFIRM
- https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0 x_refsource_CONFIRM