CVE Vulnerability

CVE-2020-28042

ServiceStack before 5.9.2 mishandles JWT signature verification unless an application has a custom ValidateToken function that establishes a valid minimum length for a signature.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

5.3 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850 Release Notes Vendor Advisory
https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee Patch Third Party Advisory
https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/ Exploit Third Party Advisory
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/ Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:servicestack:servicestack:*:*:*:*:*:*:*:*
Information

Published : 2020-11-02 09:15

Updated : 2020-11-17 05:55

NVD link : CVE-2020-28042

Mitre link : CVE-2020-28042

Products Affected
No products.
CWE
CWE-347

Improper Verification of Cryptographic Signature