CVE-2024-49755

Duende IdentityServer has insufficient validation of DPoP cnf claim in Local APIs

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.

Category

3.1
CVSS
Severity: Low
CVSS 3.1 •
EPSS 0.04%
Affected: DuendeSoftware IdentityServer
Published at:
Updated at:

References

Link Tags
https://github.com/DuendeSoftware/IdentityServer/security/advisories/GHSA-v9xq-2mvm-x8xc
https://github.com/DuendeSoftware/IdentityServer/commit/f28cac921c1f545afe65af71a9327224755b6dac

Frequently Asked Questions

What is the severity of CVE-2024-49755?
CVE-2024-49755 has been scored as a low severity vulnerability.
How to fix CVE-2024-49755?
To fix CVE-2024-49755, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-49755 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-49755 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-49755?
CVE-2024-49755 affects DuendeSoftware IdentityServer.
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