Link Following Affecting nodejs12 package, versions <12.22.10-4.29.3


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.69% (80th percentile)

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  • Snyk IDSNYK-SLES152-NODEJS12-2642205
  • published14 Apr 2022
  • disclosed2 Mar 2022

Introduced: 2 Mar 2022

CVE-2021-32803  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade SLES:15.2 nodejs12 to version 12.22.10-4.29.3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nodejs12 package and not the nodejs12 package as distributed by SLES. See How to fix? for SLES:15.2 relevant fixed versions and status.

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.

CVSS Scores

version 3.1