CVE-2024-5642

CVE-2024-5642

Medium · published June 28, 2024

CVSS v3.1
6.5
EPSS
1%
Percentile
54.2
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00744 · 54.2th percentile
Published
2024-06-28T01:15Z
References (15)
http://www.openwall.com/lists/oss-security/2024/06/28/4 · [email protected]https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e · [email protected]https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31 · [email protected]https://github.com/python/cpython/issues/121227 · [email protected]https://github.com/python/cpython/pull/23014 · [email protected]https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html · [email protected]https://mail.python.org/archives/list/[email protected]/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/ · [email protected]https://security.netapp.com/advisory/ntap-20240726-0005/ · [email protected]http://www.openwall.com/lists/oss-security/2024/06/28/4 · af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e · af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/issues/121227 · af854a3a-2127-422b-91ae-364da2661108https://github.com/python/cpython/pull/23014 · af854a3a-2127-422b-91ae-364da2661108https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html · af854a3a-2127-422b-91ae-364da2661108https://mail.python.org/archives/list/[email protected]/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/ · af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240726-0005/ · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 27 JUN 21:05Z
    Buffer overread when using an empty list with SSLContext.set_npn_protocols()
    cvelistv5