CVE-2021-37713 Information

Description

The npm package ar\ (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 directory. Additionally a .. portion of the path could occur immediately after the drive letter such as C:../foo and was not properly sanitized by the logic that checked for .. within the normalized and split portions of the path. This only affects users of node-tar on Windows systems. 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. There is no reasonable way to work around this issue without performing the same path normalization procedures that node-tar now does. Users are encouraged to upgrade to the latest patched versions of node-tar rather than attempt to sanitize paths themselves.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Reference

https://github.com/npm/node-tar/security/advisories/GHSA-5955-9wpr-37jh https://www.npmjs.com/package/tar https://www.oracle.com/security-alerts/cpuoct2021.html https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.6