CVE-2007-4559 Patch

[TrellixVulnTeam]

Patching CVE-2007-4559

Hi, we are security researchers from the Advanced Research Center at Trellix. We have began a campaign to patch a widespread bug named CVE-2007-4559. CVE-2007-4559 is a 15 year old bug in the Python tarfile package. By using extract() or extractall() on a tarfile object without sanitizing input, a maliciously crafted .tar file could perform a directory path traversal attack. We found at least one unsantized extractall() in your codebase and are providing a patch for you via pull request. The patch essentially checks to see if all tarfile members will be extracted safely and throws an exception otherwise. We encourage you to use this patch or your own solution to secure against CVE-2007-4559. Further technical information about the vulnerability can be found in this blog.

If you have further questions you may contact us through this projects lead researcher Kasimir Schulz.

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[timfel]

Hello, and thanks for the PR. This PR addresses an issue in the Python standard library, which we inherit from CPython. The issue exists in CPython's stdlib and they are discussing a fix here: python/cpython#73974. The issue has been known for years, and Red Hat's security team rated this as low severity years ago: see https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=263261 and https://nvd.nist.gov/vuln/detail/CVE-2007-4559. Thus, I recommend you work with upstream to fix this and the fix will naturally be picked up by us since we sync the Python standard library.