Buffer overread when using an empty list with SSLContext.set_npn_protocols()
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).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2024-5642US | — | — | ||
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… | ||||
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references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2024/06/28/4WEB
- https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3eWEB
- https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31WEB
- https://github.com/python/cpython/issues/121227WEB
- https://github.com/python/cpython/pull/23014WEB
- https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.htmlWEB
- https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/WEB
- https://nvd.nist.gov/vuln/detail/CVE-2024-5642WEB
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