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The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. 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. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. 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. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar.
CVE-2021-32804 - High Severity Vulnerability
Vulnerable Library - tar-4.4.8.tgz
tar for node
Library home page: https://registry.npmjs.org/tar/-/tar-4.4.8.tgz
Path to dependency file: /package.json
Path to vulnerable library: /package.json
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the
preservePaths
flag is not set totrue
. 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 intohome/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. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. Users may work around this vulnerability without upgrading by creating a customonentry
method which sanitizes theentry.path
or afilter
method which removes entries with absolute paths. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar.Publish Date: 2021-08-03
URL: CVE-2021-32804
CVSS 3 Score Details (8.1)
Base Score Metrics:
Suggested Fix
Type: Upgrade version
Origin: GHSA-3jfq-g458-7qm9
Release Date: 2021-08-03
Fix Resolution (tar): 4.4.14
Direct dependency fix Resolution (jest): 24.9.0
⛑️ Automatic Remediation will be attempted for this issue.
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