CVE-2024-49755 Duende IdentityServer has insufficient validation of DPoP cnf claim in Local APIs
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2024-49755?
CVE-2024-49755 is a low-severity vulnerability in DuendeSoftware IdentityServer, published on 28 Oct 2024.
Official description
Duende IdentityServer is an OpenID Connect and OAuth 2.x framework for ASP.NET Core. IdentityServer's local API authentication handler performs insufficient validation of the cnf claim in DPoP access tokens. This allows an attacker to use leaked DPoP access tokens at local api endpoints even without possessing the private key for signing proof tokens. Note that this only impacts custom endpoints within an IdentityServer implementation that have explicitly used the LocalApiAuthenticationHandler for authentication. This vulnerability is patched in IdentityServer 7.0.8. Version 6.3 and below are unaffected, as they do not support DPoP in Local APIs.
Weakness: CWE-287
Which versions are affected by CVE-2024-49755?
2 open source packages ship an affected version, including Duende.IdentityServer.
| Package | Affected | Fixed in |
|---|---|---|
Duende.IdentityServer NuGet | From 7.0.0 | 7.0.8 |
Duende.IdentityServer NuGet | From 7.0.0 | 7.0.8 |
How do I fix CVE-2024-49755?
Upgrade Duende.IdentityServer to 7.0.8 or later.
Is CVE-2024-49755 being exploited?
There is no known exploitation of CVE-2024-49755 in the wild and no public exploit code.
Sources
Also known as GHSA-v9xq-2mvm-x8xc.