Описание
Privilege escalation in rbac
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.
Ссылки
- https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6
- https://nvd.nist.gov/vuln/detail/CVE-2021-22538
- 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
Пакеты
github.com/google/exposure-notifications-verification-server
< 0.23.0
0.23.1
Связанные уязвимости
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.