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CVE-2021-37713

8.2 · HIGH

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.

Published Aug 31, 2021CWE-22EPSS 1.27%

Overview

CVE-2021-37713 is a high-severity vulnerability. It was published on August 31, 2021 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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 outside of the extraction target directory is not extracted. This is, in part, accomplished by sanitizing absolute paths of entries within the archive, skipping archive entries that contain `..` path portions, and resolving the sanitized paths against the extraction target directory. This logic was insufficient on Windows systems when extracting tar files that contained a path that was not an absolute path, but specified a drive letter different from the extraction target, such as `C:some\path`. If the drive letter does not match the extraction target, for example `D:\extraction\dir`, then the result of `path.resolve(extractionDirectory, entryPath)` would resolve against the current working directory on the `C:` drive, rather than the extraction target director

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcert-portal.siemens.com/productcert/pdf/ssa-389290.pdfGitHubgithub.com/npm/node-tar/security/advisories/GHSA-5955-9wpr-37jhRefwww.npmjs.com/package/tarRefwww.oracle.com/security-alerts/cpuoct2021.htmlRefcert-portal.siemens.com/productcert/pdf/ssa-389290.pdfGitHubgithub.com/npm/node-tar/security/advisories/GHSA-5955-9wpr-37jhRefwww.npmjs.com/package/tarRefwww.oracle.com/security-alerts/cpuoct2021.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-37713?

CVE-2021-37713 is a high-severity vulnerability. It was published on August 31, 2021 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2021-37713?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-37713?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-37713?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-37713 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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