CVE-2021-22538

· MEDIUMModified

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CVSS v3.1

6.3

EPSS

0.72%

Published

Mar 31, 2021

Modified

Nov 21, 2024

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Weaknesses (CWE)

CWE-20CWE-276

Affected Products (1)

google · exposure_notifications_verification_server (up to 0.23.1)vulnerable

References (8)

https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95

PatchThird Party Advisory

https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1

Release NotesThird Party Advisory

https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0