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CVE-2024-5642

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Date: June 27, 2024

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).

Language: C

Severity Score

Related Resources (10)

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/
https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
http://www.openwall.com/lists/oss-security/2024/06/28/4
https://nvd.nist.gov/vuln/detail/CVE-2024-5642
https://security-tracker.debian.org/tracker/CVE-2024-5642
https://security.netapp.com/advisory/ntap-20240726-0005/
https://github.com/python/cpython/issues/121227
https://www.mend.io/vulnerability-database/CVE-2024-5642

Severity Score

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): LOW

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