Vulnerability Details CVE-2021-22538
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 47.1%
CVSS Severity
CVSS v3 Score 6.3
CVSS v2 Score 6.5
References
- 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/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
Products affected by CVE-2021-22538
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cpe:2.3:a:google:exposure_notifications_verification_server:*