CVE-2021-22538High· 8.8▾ TwilightPrivilege escalation in rbac
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.7%
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.
The issue has been fixed in 0.24.0 and 0.23.1.
For users who are unable to upgrade, we recommend auditing users who have UserWrite permissions and regularly reviewing the Event Log for malicious activity.
Thank you to Michael Mazzolini (Ethical Hacker at WHO) for finding and disclosing this vulnerability.
github.com/google/exposure-notifications-verification-server < 0.23.1Upgrade to a patched release:
github.com/google/exposure-notifications-verification-server 0.23.1Connected by shared product, vendor, weakness, or advisory.
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