CVE-2021-32804 (High) detected in tar-4.4.8.tgz

Vulnerable Library - tar-4.4.8.tgz

tar for node

Library home page: https://registry.npmjs.org/tar/-/tar-4.4.8.tgz

Dependency Hierarchy:

• babel-cli-6.26.0.tgz (Root Library)
  • chokidar-1.7.0.tgz
    • fsevents-1.2.7.tgz
      • node-pre-gyp-0.10.3.tgz
        • ❌ tar-4.4.8.tgz (Vulnerable Library)

Found in HEAD commit: 4b7a8d7d7384aa6a27d6309c35ade0916edae7ed

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 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.

Publish Date: 2021-08-03

URL: CVE-2021-32804

CVSS 3 Score Details (8.1)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: High
  • Availability Impact: High

Suggested Fix

Type: Upgrade version

Origin: https://github.com/npm/node-tar/security/advisories/GHSA-3jfq-g458-7qm9

Release Date: 2021-08-03

Fix Resolution: tar - 3.2.2, 4.4.14, 5.0.6, 6.1.1