| Name | CVE-2024-5642 |
| 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 (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
The information below is based on the following data on fixed versions.
Notes
- python3.13 <not-affected> (Fixed before initial upload)
- python3.12 <not-affected> (Fixed before initial upload)
- python3.11 <not-affected> (Fixed before initial upload)
[bullseye] - python3.9 <ignored> (NPN support already disabled with OpenSSL 1.1.1)
[bullseye] - python2.7 <ignored> (Unsupported in Bullseye, only included to build a few applications)
https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
https://github.com/python/cpython/pull/23014
https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/
https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e (v3.10.0b1)
NPN support already disabled with OpenSSL >= 1.1.1 in buster and bullseye:
https://github.com/python/cpython/commit/29eab55309b9f78b79074d26db16a44e7841c639 (v3.8.0a1)
https://github.com/python/cpython/commit/961774184eb950e2547ab0d42653439adc735924 (v3.7.0b2)