Arbitrary file write when scanning a specially-crafted local PyPI package

Impact

Running GuardDog against a specially-crafted package can allow an attacker to write an arbitrary file on the machine where GuardDog is executed.

This is due to a path traversal vulnerability when extracting the .tar.gz file of the package being scanned, which exists by design in the tarfile.TarFile.extractall function. See also https://docs.python.org/3/library/tarfile.html#tarfile.TarFile.extractall

Remediation

Upgrade to GuardDog v0.1.5 or more recent.

References

• https://semgrep.dev/r?q=trailofbits.python.tarfile-extractall-traversal.tarfile-extractall-traversal
• https://www.trellix.com/en-us/about/newsroom/stories/research/tarfile-exploiting-the-world.html
• https://docs.python.org/3/library/tarfile.html#tarfile.TarFile.extractall