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CVE-2024-0202— Cryptlib: rsa key exchange ciphersuites in tls vulnerable to marvin attack

Quick assessment

Affected
CVE-2024-0202
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.

cryptlib是cryptlib公司的一个开源的跨平台软件安全工具箱库。 cryptlib存在安全漏洞，该漏洞源于编译时支持TLS中的RSA密钥交换密码套件，攻击者能够解密RSA密文或使用服务器证书伪造签名。

CVSS 5.9 · Medium EPSS 0.31% · P22

I. Basic Information for CVE-2024-0202

Vulnerability Information
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Vulnerability Title
Cryptlib: rsa key exchange ciphersuites in tls vulnerable to marvin attack
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been identified in the cryptlib cryptographic library when cryptlib is compiled with the support for RSA key exchange ciphersuites in TLS (by setting the USE_RSA_SUITES define), it will be vulnerable to the timing variant of the Bleichenbacher attack. An attacker that is able to perform a large number of connections to the server will be able to decrypt RSA ciphertexts or forge signatures using server's certificate. THIS CVE ID IS CURRENTLY DISPUTED - MAINTAINER NOTE: There are only two situations where it's enabled, one is for fuzz-testing to exercise code paths that wouldn't otherwise be available, the other is for static source code analysis with tools like Coverity and Prefast, again to open up code paths that otherwise wouldn't be available. It can also be enabled manually in two specific test builds just to make sure the code still compiles OK, to avoid bit rot and verify that the fuzz-testing build will compile without errors.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
cryptlib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cryptlib是cryptlib公司的一个开源的跨平台软件安全工具箱库。 cryptlib存在安全漏洞，该漏洞源于编译时支持TLS中的RSA密钥交换密码套件，攻击者能够解密RSA密文或使用服务器证书伪造签名。
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)

II. Public POCs for CVE-2024-0202

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III. Intelligence Information for CVE-2024-0202

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Vendor Advisories for CVE-2024-0202 (1)

IV. Related Vulnerabilities

Same weakness: CWE-208

V. Comments for CVE-2024-0202

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