node-tar aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary stat calls to determine whether a given path is a directory, paths are cached when directories are created.
This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory. This order of operations resulted in the directory being created and added to the node-tar directory cache. When a directory is present in the directory cache, subsequent calls to mkdir for that directory are skipped. However, this is also where node-tar checks for symlinks occur.
By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass node-tar symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite.
This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and 6.1.2.
Patches
3.2.3 || 4.4.15 || 5.0.7 || 6.1.2
Workarounds
Users may work around this vulnerability without upgrading by creating a custom filter method which prevents the extraction of symbolic links.
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Bumps tar from 6.1.0 to 6.1.3. This update includes a security fix.
Vulnerabilities fixed
Sourced from The GitHub Security Advisory Database.
... (truncated)
Commits
0b783866.1.356c24b0fix: properly handle top-level files when using strip8d75229ci: Create codeql workflow3f7b2006.1.29dbdeb6Remove paths from dirCache when no longer dirs1e335346.1.11f036cafix: strip absolute paths more comprehensively1b94260tap@15Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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