KnowSafe 安全预警：cryptopp crypto++ 使用已被攻破或存在风险的密码学算法

KnowSafe 安全预警：KnowSafe 安全团队监测到编号 AVD-2021-40530 的安全漏洞（危害等级：高危）已公开披露，相关用户应尽快排查并完成修复。

漏洞介绍

The ElGamal implementation in Crypto++ through 8.5 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.

影响范围

应用：cryptopp crypto++（影响面 Up to (including) 8.5）

系统：debian_12 libcrypto++（影响面 Up to (excluding) 8.6.0-1）

系统：fedora_33 cryptopp（影响面 Up to (excluding) 8.6.0-1.fc33）

系统：fedora_34 cryptopp（影响面 Up to (excluding) 8.6.0-1.fc34）

系统：fedora_35 cryptopp（影响面 Up to (excluding) 8.6.0-1.fc35）

系统：fedora_EPEL_8 cryptopp（影响面 Up to (excluding) 8.6.0-1.el8）

解决方案

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考信息

https://eprint.iacr.org/2021/923

https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1

https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/

KnowSafe 将持续跟踪该漏洞的利用情况与修复进展，如需漏洞管理与应急响应支持，欢迎联系 KnowSafe 安全团队。