`libparsec_crypto` does not check for weak order point of curve 25519

Parsec is a cloud-based application for cryptographically secure file sharing. In versions on the 3.x branch prior to 3.6.0, `libparsec_crypto`, a component of the Parsec application, does not check for weak order point of Curve25519 when compiled with its RustCrypto backend. In practice this means an attacker in a man-in-the-middle position would be able to provide weak order points to both parties in the Diffie-Hellman exchange, resulting in a high probability to for both parties to obtain the same shared key (hence leading to a successful SAS code exchange, misleading both parties into thinking no MITM has occurred) which is also known by the attacker. Note only Parsec web is impacted (as Parsec desktop uses `libparsec_crypto` with the libsodium backend). Version 3.6.0 of Parsec patches the issue.

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

使用已被攻破或存在风险的密码学算法

parsec-cloud 安全漏洞

parsec-cloud是Scille开源的一个文件共享工具。 parsec-cloud 3.6.0之前版本存在安全漏洞，该漏洞源于libparsec_crypto组件未检查Curve25519的弱阶点，可能导致中间人攻击。

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