DuendeSoftware IdentityServer up to 7.0.7 API improper authentication

Summaryinfo

A vulnerability has been found in DuendeSoftware IdentityServer up to 7.0.7 and classified as critical. This affects an unknown function of the component API. This manipulation causes improper authentication. This vulnerability appears as CVE-2024-49755. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in DuendeSoftware IdentityServer up to 7.0.7. It has been declared as problematic. Affected by this vulnerability is an unknown part of the component API. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2024-49755 since 10/18/2024. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 7.0.8 eliminates this vulnerability. Applying the patch f28cac921c1f545afe65af71a9327224755b6dac is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• DuendeSoftware

Name

• IdentityServer

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7

License

• open-source

Website

• Product: https://github.com/DuendeSoftware/IdentityServer/

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