Bug 2370013 (CVE-2024-12718)

Summary: CVE-2024-12718 cpython: Bypass extraction filter to modify file metadata outside extraction directory
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bbrownin, dfreiber, drow, jburrell, ljawale, luizcosta, nweather, rbobbitt, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in CPython's tarfile module. This vulnerability allows modification of file metadata, such as timestamps or permissions, outside the intended extraction directory via maliciously crafted tar archives using the filter="data" or filter="tar" extraction filters.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2370022    
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Description OSIDB Bzimport 2025-06-03 14:01:20 UTC 
Allows modifying some file metadata (e.g. last modified) with filter="data" or file permissions (chmod) with filter="tar" of files outside the extraction directory.
You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile  extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter  for more information. Only Python versions 3.12 or later are affected by these vulnerabilities, earlier versions don't include the extraction filter feature.

Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected.

Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.