CVE-2020-28042

EUVD-2021-0516
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 97%
Affected Products (NVD)
VendorProductVersion
servicestackservicestack
𝑥
< 5.9.2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
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/
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/