CVE-2020-28042 Information

Description

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.

Reference

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/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/