MS IdentityModel SignedHttpRequest jku Trust Flaw v7.x<7.1.2 / v6.x<6.34.0
CVE-2024-21643 Published on January 10, 2024
Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability
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.
Vulnerability Analysis
CVE-2024-21643 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a Code Injection Vulnerability?
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CVE-2024-21643 has been classified to as a Code Injection vulnerability or weakness.
Products Associated with CVE-2024-21643
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Affected Versions
AzureAD azure-activedirectory-identitymodel-extensions-for-dotnet:- Version < 6.34.0 is affected.
- Version >= 7.0.0-preview, < 7.1.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.