CVE Vulnerability

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.

6.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

8.8 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95 Patch Third Party Advisory
https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1 Release Notes Third Party Advisory
https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0 Release Notes Third Party Advisory
https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:google:exposure_notifications_verification_server:*:*:*:*:*:*:*:*
Information

Published : 2021-03-31 09:15

Updated : 2021-04-06 02:11

NVD link : CVE-2021-22538

Mitre link : CVE-2021-22538

Products Affected
No products.
CWE
CWE-276

Incorrect Default Permissions