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CVE-2024-42350— Public key confusion in third party block in Biscuit

Quick assessment

Affected
biscuit-auth biscuit
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.

Biscuit是biscuit-auth开源的一个委托的、去中心化的、基于能力的授权令牌。 Biscuit存在安全漏洞，该漏洞源于允许恶意用户通过伪造的第三方区块请求来欺骗第三方权威机构生成信任错误的密钥对的数据日志。

CVSS 3.0 · Low EPSS 0.29% · P20
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I. Basic Information for CVE-2024-42350

Vulnerability Information
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Vulnerability Title
Public key confusion in third party block in Biscuit
Source: CVE Program / CVE List V5
Vulnerability Description
Biscuit is an authorization token with decentralized verification, offline attenuation and strong security policy enforcement based on a logic language. Third-party blocks can be generated without transferring the whole token to the third-party authority. Instead, a `ThirdPartyBlock` request can be sent, providing only the necessary info to generate a third-party block and to sign it: 1. the public key of the previous block (used in the signature), 2. the public keys part of the token symbol table (for public key interning in datalog expressions). A third-part block request forged by a malicious user can trick the third-party authority into generating datalog trusting the wrong keypair. Tokens with third-party blocks containing `trusted` annotations generated through a third party block request. This has been addressed in version 4 of the specification. Users are advised to update their implementations to conform. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
Biscuit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Biscuit是biscuit-auth开源的一个委托的、去中心化的、基于能力的授权令牌。 Biscuit存在安全漏洞，该漏洞源于允许恶意用户通过伪造的第三方区块请求来欺骗第三方权威机构生成信任错误的密钥对的数据日志。
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
biscuit-auth biscuit < 4 -

II. Public POCs for CVE-2024-42350

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III. Intelligence Information for CVE-2024-42350

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Patches & Fixes for CVE-2024-42350 (1)

Vendor Advisories for CVE-2024-42350 (1)

IV. Related Vulnerabilities

Same product: biscuit
Same vendor: biscuit-auth
Same weakness: CWE-668

V. Comments for CVE-2024-42350

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