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.

Score

CVSS 3.1 8.8 High

Status

Modified - cve-coordination@google.com

Published

2021-03-31

Last modified

2024-08-03

Weaknesses

CWE-20, CWE-276

Affected products

• Exposure Notifications Verification Server (Google)
• Exposure Notifications Verification Server (Google Llc)

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