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.

[bandish-shah]

@TrellixVulnTeam thank you for reporting this issue and submitting the patch. Upon careful evaluation of the proposed fix and performing a security risk assessment, we have decided to not submit this code patch. Instead, we will update our documentation with a warning to users to only load checkpoints from trusted sources in all scenarios which exercise this code path. The documentation update can be found in PR #1959 and will be released with the next Composer version.