高危 cryptopp crypto++ 使用已被攻破或存在风险的密码学算法

CVE编号

CVE-2021-40530

利用情况

POC 已公开

补丁情况

官方补丁

披露时间

2021-09-07

漏洞描述

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.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://eprint.iacr.org/2021/923
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-...
https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-...
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedora...
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedora...
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedora...

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	应用	cryptopp	crypto++	*		Up to (including) 8.5
	运行在以下环境
	系统	debian_10	libcrypto++	*		Up to (including) 5.6.4-8
	运行在以下环境
	系统	debian_11	libcrypto++	*		Up to (including) 8.4.0-1
	运行在以下环境
	系统	debian_12	libcrypto++	*		Up to (excluding) 8.6.0-1
	运行在以下环境
	系统	debian_9	libcrypto++	*		Up to (including) 5.6.4-7
	运行在以下环境
	系统	debian_sid	libcrypto++	*		Up to (excluding) 8.6.0-1
	运行在以下环境
	系统	fedora_33	cryptopp-debugsource	*		Up to (excluding) 8.6.0-1.fc33
	运行在以下环境
	系统	fedora_34	cryptopp-debugsource	*		Up to (excluding) 8.6.0-1.fc34
	运行在以下环境
	系统	fedora_35	cryptopp-debugsource	*		Up to (excluding) 8.6.0-1.fc35
	运行在以下环境
	系统	fedora_EPEL_8	cryptopp-debugsource	*		Up to (excluding) 8.6.0-1.el8

阿里云评分 7.0

• 攻击路径 远程
• 攻击复杂度 复杂
• 权限要求 无需权限
• 影响范围 全局影响
• EXP成熟度 POC 已公开
• 补丁情况 官方补丁
• 数据保密性 数据泄露
• 数据完整性 无影响
• 服务器危害 无影响
• 全网数量 N/A

CWE-ID	漏洞类型
CWE-327	使用已被攻破或存在风险的密码学算法

Exp相关链接

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

- avd.aliyun.com