JWT Signature Verification Bypass in ServiceStack by ServiceStack Software
CVE-2020-28042

5.3MEDIUM

Key Information:

Vendor

Servicestack

Status
Servicestack
Vendor
CVE Published:
2 November 2020

What is CVE-2020-28042?

ServiceStack, an open-source .NET web services framework, exhibits a vulnerability in its handling of JSON Web Token (JWT) signature verification. Versions before 5.9.2 fail to validate the minimum length of JWT signatures unless a custom ValidateToken function is implemented. This flaw can lead to unauthorized access, allowing malicious actors to bypass authentication mechanisms and compromise applications relying on JWT for secure communications.

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References

https://forums.servicestack.net/t/servicestack-v5-9-2-rel...
x_refsource_MISC
https://github.com/ServiceStack/ServiceStack/commit/540d4...
x_refsource_MISC
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt...
x_refsource_MISC

EPSS Score

35% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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