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CVE-2024-5642

6.5 · MEDIUM

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.

Published Jun 27, 2024EPSS 0.74%

Overview

CVE-2024-5642 is a medium-severity vulnerability. It was published on June 27, 2024 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2024/06/28/4GitHubgithub.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3eGitHubgithub.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31GitHubgithub.com/python/cpython/issues/121227GitHubgithub.com/python/cpython/pull/23014Refjbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.htmlRefmail.python.org/archives/list/[email protected]/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/Refsecurity.netapp.com/advisory/ntap-20240726-0005/Refwww.openwall.com/lists/oss-security/2024/06/28/4GitHubgithub.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e

How CyberStrike helps

Frequently asked questions

What is CVE-2024-5642?

CVE-2024-5642 is a medium-severity vulnerability. It was published on June 27, 2024 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2024-5642?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-5642?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-5642?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-5642 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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