CVE-2021-32803 (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 6.1.2, 5.0.7, 4.4.15, and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via insufficient symlink protection. 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.

Publish Date: 2021-08-03

URL: CVE-2021-32803

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-r628-mhmh-qjhw

Release Date: 2021-08-03

Fix Resolution: tar - 3.2.3, 4.4.15, 5.0.7, 6.1.2