MEDIUM

GHSA-v5rv-hpxg-8x49

Signature validation bypass in ServiceStack

Quick fix

GHSA-v5rv-hpxg-8x49 — ServiceStack: upgrade to the fixed version with the command below.

dotnet add package ServiceStack --version 5.9.2

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

NuGet/ServiceStack

Introduced in: 0Fixed in: 5.9.2

Fixdotnet add package ServiceStack --version 5.9.2

References

https://nvd.nist.gov/vuln/detail/CVE-2020-28042[ADVISORY]
https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee[WEB]
https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850[WEB]
https://snyk.io/vuln/SNYK-DOTNET-SERVICESTACK-1035519[WEB]
https://www.nuget.org/packages/ServiceStack[WEB]
https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass[WEB]
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack[WEB]