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CVE-2024-49755— Duende IdentityServer has insufficient validation of DPoP cnf claim in Local APIs

Quick assessment

Affected
DuendeSoftware IdentityServer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Duende IdentityServer是Duende开源的一个适用于 ASP.NET Core 的、符合标准的 OpenID Connect 和 OAuth 2.x 框架。 Duende IdentityServer 7.0.0及之前版本存在授权问题漏洞，该漏洞源于本地API身份验证处理程序对DPoP访问令牌中的cnf声明执行的验证不足，导致攻击者可使用泄露的DPoP访问令牌。

CVSS 3.1 · Low EPSS 0.33% · P24
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I. Basic Information for CVE-2024-49755

Vulnerability Information
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Vulnerability Title
Duende IdentityServer has insufficient validation of DPoP cnf claim in Local APIs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Duende IdentityServer 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Duende IdentityServer是Duende开源的一个适用于 ASP.NET Core 的、符合标准的 OpenID Connect 和 OAuth 2.x 框架。 Duende IdentityServer 7.0.0及之前版本存在授权问题漏洞，该漏洞源于本地API身份验证处理程序对DPoP访问令牌中的cnf声明执行的验证不足，导致攻击者可使用泄露的DPoP访问令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
DuendeSoftware IdentityServer >= 7.0.0, < 7.0.8 -

II. Public POCs for CVE-2024-49755

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III. Intelligence Information for CVE-2024-49755

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Patches & Fixes for CVE-2024-49755 (1)

Vendor Advisories for CVE-2024-49755 (1)

IV. Related Vulnerabilities

Same product: IdentityServer
Same vendor: DuendeSoftware
Same weakness: CWE-287

V. Comments for CVE-2024-49755

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