-------- Forwarded Message --------
Subject: [Security-announce][CVE-2024-3220] Default mimetype known files
writeable on Windows
Date: Fri, 14 Feb 2025 10:16:45 -0600
From: Seth Larson <s...@python.org>
Reply-To: security-...@python.org
To: security-annou...@python.org
There is a LOW severity vulnerability affecting CPython.
There is a defect in the CPython standard library module “mimetypes” where on
Windows the default list of known file locations are writable meaning other
users can create invalid files to cause MemoryError to be raised on Python
runtime startup or have file extensions be interpreted as the incorrect file type.
This defect is caused by the default locations of Linux and macOS platforms
(such as “/etc/mime.types”) also being used on Windows, where they are
user-writable locations (“C:\etc\mime.types”).
To work-around this issue a user can call mimetypes.init() with an empty list
(“[]”) on Windows platforms to avoid using the default list of known file
locations. There is no patch available yet, the CVE will be updated once there
is a fixed version.
Please see the linked CVE ID for the latest information on affected versions:
https://www.cve.org/CVERecord?id=CVE-2024-3220
<https://www.cve.org/CVERecord?id=CVE-2024-3220>
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