CVE-2024-3219

Published Jul 29, 2024 Modified Apr 15, 2026 CWE-306

Description

The “socket” module provides a pure-Python fallback to the socket.socketpair() function for platforms that don’t support AF_UNIX, such as Windows. This pure-Python implementation uses AF_INET or AF_INET6 to create a local connected pair of sockets. The connection between the two sockets was not verified before passing the two sockets back to the user, which leaves the server socket vulnerable to a connection race from a malicious local peer. Platforms that support AF_UNIX such as Linux and macOS are not affected by this vulnerability. Versions prior to CPython 3.5 are not affected due to the vulnerable API not being included.

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Weakness Type (CWE)

CWE-306 Missing Authentication

References

Other References

http://www.openwall.com/lists/oss-security/2024/07/29/3 https://github.com/python/cpython/commit/06fa244666ec6335a3b9bf2367e31b42b9a89b20 https://github.com/python/cpython/commit/0b65c8bf5367625673eafb92f85046a1b31259f2 https://github.com/python/cpython/commit/220e31adeaaa8436c9ff234cba1398bc49e2bb6c https://github.com/python/cpython/commit/2621a8a40ba4b2c68ca564671b7daa5da80a4508 https://github.com/python/cpython/commit/31302f5fc24eecd693f0c8aaba7c2840b09b594d https://github.com/python/cpython/commit/3f5d9d12c74787fbf3f5891835c85cc15526c86d https://github.com/python/cpython/commit/5df322e91a40909e6904bbdbc0c3a6b6a9eead39 https://github.com/python/cpython/commit/5f90abaa786f994db3907fc31e2ee00ea2cf0929 https://github.com/python/cpython/commit/78df1043dbdce5c989600616f9f87b4ee72944e5

Frequently Asked Questions

What is CVE-2024-3219? +
The “socket” module provides a pure-Python fallback to the socket.socketpair() function for platforms that don’t support AF_UNIX, such as Windows. This pure-Python implementation uses AF_INET or AF_INET6 to create a local connected pair of sockets. The connection between the two sockets was not verified before passing the two sockets back to the user, which leaves the server socket vulnerable to a connection race from a malicious local peer. Platforms that support AF_UNIX such as Linux and macOS are not affected by this vulnerability. Versions prior to CPython 3.5 are not affected due to the vulnerable API not being included.
How do I check if I'm vulnerable to CVE-2024-3219? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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