CVE-2024-5642 : PYTHON SOFTWARE CPYTHON UP TO 3.9.X SSLCONTEXT.SET_NPN_PROTOCOLS BUFFER OVERFLOW

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).

References

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

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