IdentityModel Extensions for .NET provide assemblies for web developers that wish to use federated identity providers for establishing the caller's identity. Anyone leveraging the SignedHttpRequest
protocol or the SignedHttpRequestValidator
is vulnerable. Microsoft.IdentityModel trusts the jku
claim by default for the SignedHttpRequest
protocol. This raises the possibility to make any remote or local HTTP GET
request. The vulnerability has been fixed in Microsoft.IdentityModel.Protocols.SignedHttpRequest. Users should update all their Microsoft.IdentityModel versions to 7.1.2 (for 7x) or higher, 6.34.0 (for 6x) or higher.