Path Traversal in MHolt Archiver

All versions of archiver allow attacker to perform a Zip Slip attack via the “unarchive” functions. It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a “…/…/file.exe” location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

Specific Go Packages Affected

github.com/mholt/archiver/cmd/arc