| 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) |
| References | ELA-1137-1, ELA-1138-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| pypy (PTS) | jessie | 2.4.0+dfsg-3 | vulnerable |
| stretch | 5.6.0+dfsg-4 | vulnerable |
| buster | 7.0.0+dfsg-3 | vulnerable |
| bullseye | 7.3.3+dfsg-2 | vulnerable |
| python2.7 (PTS) | jessie, jessie (lts) | 2.7.9-2-ds1-1+deb8u12 | vulnerable |
| stretch (security) | 2.7.13-2+deb9u6 | vulnerable |
| stretch (lts), stretch | 2.7.13-2+deb9u9 | vulnerable |
| buster (security), buster, buster (lts) | 2.7.16-2+deb10u4 | vulnerable |
| bullseye | 2.7.18-8+deb11u1 | vulnerable |
| python3.11 (PTS) | bookworm | 3.11.2-6+deb12u4 | fixed |
| bookworm (security) | 3.11.2-6+deb12u3 | fixed |
| python3.12 (PTS) | sid, trixie | 3.12.7-3 | fixed |
| python3.13 (PTS) | sid, trixie | 3.13.0-2 | fixed |
| python3.4 (PTS) | jessie, jessie (lts) | 3.4.2-1+deb8u18 | fixed |
| python3.5 (PTS) | stretch (security) | 3.5.3-1+deb9u5 | vulnerable |
| stretch (lts), stretch | 3.5.3-1+deb9u10 | fixed |
| python3.7 (PTS) | buster, buster (lts) | 3.7.3-2+deb10u8 | vulnerable |
| buster (security) | 3.7.3-2+deb10u7 | vulnerable |
| python3.9 (PTS) | bullseye | 3.9.2-1 | vulnerable |
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)
[buster] - python2.7 <ignored> (NPN support already disabled with OpenSSL 1.1.1)
[stretch] - python2.7 <postponed> (Minor issue)
[jessie] - python2.7 <postponed> (Minor issue)
[buster] - python3.7 <ignored> (NPN support already disabled with OpenSSL 1.1.1)