Public key confusion in third party block in Biscuit

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.

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:N

将资源暴露给错误范围

Biscuit 安全漏洞

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。

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