Bug 2294682 (CVE-2024-5642) - CVE-2024-5642 python: Invalid value for OpenSSL API may cause Buffer over-read when NPN is used
Summary: CVE-2024-5642 python: Invalid value for OpenSSL API may cause Buffer over-rea...
Keywords:
Status: NEW
Alias: CVE-2024-5642
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2294685 2294683 2294684 2294686 2294687 2294688 2294689
Blocks: 2294681
TreeView+ depends on / blocked
 
Reported: 2024-06-28 03:45 UTC by Patrick Del Bello
Modified: 2024-07-16 09:11 UTC (History)
24 users (show)

Fixed In Version:
Doc Type: ---
Doc Text:
A vulnerability was found in Python/CPython that does not disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols(), which is an invalid value for the underlying OpenSSL API. This issue results in a buffer over-read when NPN is used. See CVE -2024-5535 for OpenSSL for more information.
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Description Patrick Del Bello 2024-06-28 03:45:26 UTC
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).

https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
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/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/

Comment 2 Patrick Del Bello 2024-06-28 04:07:40 UTC
Created mingw-python3 tracking bugs for this issue:

Affects: fedora-all [bug 2294684]


Created python2.7 tracking bugs for this issue:

Affects: fedora-all [bug 2294685]


Created python3.6 tracking bugs for this issue:

Affects: fedora-all [bug 2294686]


Created python3.7 tracking bugs for this issue:

Affects: fedora-all [bug 2294687]


Created python3.8 tracking bugs for this issue:

Affects: fedora-all [bug 2294688]


Created python3.9 tracking bugs for this issue:

Affects: fedora-all [bug 2294689]


Created python34 tracking bugs for this issue:

Affects: epel-all [bug 2294683]


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