node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the preservePaths flag is not set to true. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example /home/user/.bashrc would turn into home/user/.bashrc.
This logic was insufficient when file paths contained repeated path roots such as ////home/user/.bashrc. node-tar would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. ///home/user/.bashrc) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite.
Patches
3.2.2 || 4.4.14 || 5.0.6 || 6.1.1
NOTE: an adjacent issue CVE-2021-32803 affects this release level. Please ensure you update to the latest patch levels that address CVE-2021-32803 as well if this adjacent issue affects your node-tar use case.
Workarounds
Users may work around this vulnerability without upgrading by creating a custom onentry method which sanitizes the entry.path or a filter method which removes entries with absolute paths.
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 4.4.8 to 4.4.15. This update includes security fixes.
Vulnerabilities fixed
Sourced from The GitHub Security Advisory Database.
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Sourced from The GitHub Security Advisory Database.
... (truncated)
Commits
843c8974.4.1546fe350Remove paths from dirCache when no longer dirsdf3aa4d4.4.146d28013add publishConfig tagefc6bb0fix: strip absolute paths more comprehensively65edb394.4.13d04c3ffAlways provide a callback to fs.close()dbd6f524.4.120240086update tap and minipass9232b3d4.4.11Dependabot 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
@dependabot rebase.If all status checks pass Dependabot will automatically merge this pull request.
Dependabot commands and options
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