CVE-2021-37712 (High) detected in tar-4.4.13.tgz

[mend-bolt-for-github]

CVE-2021-37712 - High Severity Vulnerability

Vulnerable Library - tar-4.4.13.tgz

tar for node

Library home page: https://registry.npmjs.org/tar/-/tar-4.4.13.tgz

Path to dependency file: /package.json

Path to vulnerable library: /node_modules/npm/node_modules/tar/package.json

Dependency Hierarchy:

• npm-7.0.10.tgz (Root Library)
  • npm-6.14.11.tgz
    • ❌ tar-4.4.13.tgz (Vulnerable Library)

Found in HEAD commit: 69d565b83c3019e5219ba60193bb28b75db7316e

Found in base branch: master

Vulnerability Details

The npm package "tar" (aka node-tar) before versions 4.4.18, 5.0.10, and 6.1.9 has an arbitrary file creation/overwrite and arbitrary code execution vulnerability. 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 names containing unicode values that normalized to the same value. Additionally, on Windows systems, long path portions would resolve to the same file system entities as their 8.3 "short path" counterparts. A specially crafted tar archive could thus include a directory with one form of the path, followed by a symbolic link with a different string that resolves to the same file system entity, followed by a file using the first form. By first creating a directory, and then replacing that directory with a symlink that had a different apparent name that resolved to the same entry in the filesystem, 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. These issues were addressed in releases 4.4.18, 5.0.10 and 6.1.9. The v3 branch of node-tar has been deprecated and did not receive patches for these issues. If you are still using a v3 release we recommend you update to a more recent version of node-tar. If this is not possible, a workaround is available in the referenced GHSA-qq89-hq3f-393p.

Publish Date: 2021-08-31

URL: CVE-2021-37712

CVSS 3 Score Details (8.6)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-qq89-hq3f-393p

Release Date: 2021-08-31

Fix Resolution (tar): 4.4.18

Direct dependency fix Resolution (@semantic-release/npm): 7.1.0

---

Step up your Open Source Security Game with Mend here

[github-actions]

👋 Thanks for reporting!

[mend-bolt-for-github]

✔️ This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.

[github-actions]

Thank you for your report, the issue you have reported has just been fixed.

• In case you see a problem with the fix, please comment on this issue.
• In case you see a similar problem, please open a separate issue.
• If you are happy with the outcome, don’t hesitate to support Weblate by making a donation.

[mend-bolt-for-github]

ℹ️ This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.