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CVE-2020-28042

Good to know:

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Date: October 31, 2020

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.

Language: C#

Severity Score

Related Resources (9)

https://nvd.nist.gov/vuln/detail/CVE-2020-28042
https://www.nuget.org/packages/ServiceStack
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/
https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850
https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee
https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass
https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/
https://www.mend.io/vulnerability-database/CVE-2020-28042

Severity Score

Weakness Type (CWE)

Improper Verification of Cryptographic Signature

CWE-347

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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