Fwd: [Security-announce] [CVE-2024-3219] Pure-Python fallback of socket.socketpair() doesn’t authenticate peer connection

[Alan Coopersmith <alan.coopersmith () oracle com>]

-------- Forwarded Message --------
Subject:        [Security-announce] [CVE-2024-3219] Pure-Python fallback of socket.socketpair() doesn’t authenticate 
peer connection
Date:   Mon, 29 Jul 2024 16:54:59 -0500
From:   Seth Larson <seth () python org>
Reply-To:       security-sig () python org
To:     security-announce () python org



There is a MEDIUM severity vulnerability affecting CPython.

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.

Please see the linked CVE ID for the latest information on affected versions:

* https://www.cve.org/CVERecord?id=CVE-2024-3219 <https://www.cve.org/CVERecord?id=CVE-2024-3219>
* https://github.com/python/cpython/pull/122134 <https://github.com/python/cpython/pull/122134>
* https://github.com/python/cpython/issues/122133 <https://github.com/python/cpython/issues/122133>