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.

CVSS v3.0 8.8 HIGH
CVSS v2.0 6.5 MEDIUM

8.8^/10

CVSS v3.0 : HIGH

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

6.5^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:S/C:P/I:P/A:P

Exploitability : 8.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

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

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Configurations

Configuration 1 (hide)

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

Information

Published : 2021-03-31 14:15

Updated : 2021-04-06 07:11

NVD link : CVE-2021-22538

Mitre link : CVE-2021-22538

JSON object : View

CWE

CWE-276

Incorrect Default Permissions

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Products Affected

google

exposure_notifications_verification_server

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