Directory Traversal Affecting npm package, versions <1:6.14.15-1.14.18.2.2.module+el8.5.0+20489+261d51d3


Severity

Recommended
medium

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.16% (53rd percentile)

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  • Snyk IDSNYK-ORACLE8-NPM-2602164
  • published10 Apr 2022
  • disclosed31 Aug 2021

Introduced: 31 Aug 2021

CVE-2021-37701  (opens in a new tab)
CWE-22  (opens in a new tab)
CWE-59  (opens in a new tab)

How to fix?

Upgrade Oracle:8 npm to version 1:6.14.15-1.14.18.2.2.module+el8.5.0+20489+261d51d3 or higher.
This issue was patched in ELSA-2022-0350.

NVD Description

Note: Versions mentioned in the description apply only to the upstream npm package and not the npm package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

The npm package "tar" (aka node-tar) before versions 4.4.16, 5.0.8, and 6.1.7 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 the same name as the directory, where the symlink and directory names in the archive entry used backslashes as a path separator on posix systems. The cache checking logic used both \ and / characters as path separators, however \ is a valid filename character on posix systems. 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. Additionally, a similar confusion could arise on case-insensitive filesystems. If a tar archive contained a directory at FOO, followed by a symbolic link named foo, then on case-insensitive file systems, the creation of the symbolic link would remove the directory from the filesystem, but not from the internal directory cache, as it would not be treated as a cache hit. A subsequent file entry within the FOO directory would then be placed in the target of the symbolic link, thinking that the directory had already been created. These issues were addressed in releases 4.4.16, 5.0.8 and 6.1.7. 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-9r2w-394v-53qc.

CVSS Scores

version 3.1