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).
CVSS Score
MEDIUM
References
- http://www.openwall.com/lists/oss-security/2024/06/28/4
- https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3
- https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe3
- https://github.com/python/cpython/issues/121227
- https://github.com/python/cpython/pull/23014
- https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
- https://mail.python.org/archives/list/[email protected]/thread/PLP2JI
- https://security.netapp.com/advisory/ntap-20240726-0005/
- http://www.openwall.com/lists/oss-security/2024/06/28/4
- https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3
- https://github.com/python/cpython/issues/121227
- https://github.com/python/cpython/pull/23014
- https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
- https://mail.python.org/archives/list/[email protected]/thread/PLP2JI
- https://security.netapp.com/advisory/ntap-20240726-0005/
FAQ
What is CVE-2024-5642?
CVE-2024-5642 is a vulnerability with a CVSS score of 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. This results in a buffer over-rea...
How severe is CVE-2024-5642?
CVE-2024-5642 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-5642?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.