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CVE-2024-5642— Buffer overread when using an empty list with SSLContext.set_npn_protocols()

Quick assessment

Affected
Python Software Foundation CPython
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.

Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python 3.9 及之前版本存在安全漏洞，该漏洞源于使用 NPN 时会导致缓冲区过度读取。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 2

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.9.24 affected
3.10.0a1< 3.10.0b1 affected
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I. Basic Information for CVE-2024-5642

Vulnerability Information
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Vulnerability Title
Buffer overread when using an empty list with SSLContext.set_npn_protocols()
Source: CVE Program / CVE List V5
Vulnerability Description
CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python 3.9 及之前版本存在安全漏洞，该漏洞源于使用 NPN 时会导致缓冲区过度读取。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.9.24 -

II. Public POCs for CVE-2024-5642

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III. Intelligence Information for CVE-2024-5642

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Patches & Fixes for CVE-2024-5642 (3)

Vendor Advisories for CVE-2024-5642 (1)

Mailing List Discussions for CVE-2024-5642 (1)

Other References for CVE-2024-5642 (3)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2024-5642

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