Bug 2294682 (CVE-2024-5642)

Summary: CVE-2024-5642 python: Invalid value for OpenSSL API may cause Buffer over-read when NPN is used
Product: [Other] Security Response Reporter: Patrick Del Bello <pdelbell>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: agarcial, aoconnor, aprice, asegurap, bdettelb, caswilli, dfreiber, drow, jburrell, jmitchel, jsamir, jsherril, jtanner, kaycoth, kholdawa, kshier, mpierce, orabin, psegedy, sthirugn, vkrizan, vkumar, xiaoxwan, zzhou
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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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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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2294685, 2294683, 2294684, 2294686, 2294687, 2294688, 2294689    
Bug Blocks: 2294681    

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]