CVE-2021-32804

Aliases:GHSA-3jfq-g458-7qm9
Advisory lineage Upstream: 0 Downstream: 21
Modified
Published: 03 Aug 2021, 19:10
Last modified:03 Aug 2024, 23:33

Vulnerability Summary

Overall Risk (default)
high
50/100
CVSS Score
8.2 HIGH
v3.1 (cve.org)
EPSS Score
84.98% CRITICAL
85% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

03 Aug 2021, 19:10
Published
Vulnerability first disclosed
03 Aug 2024, 23:33
Last Modified
Vulnerability information updated

Description

The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the `preservePaths` flag is not set to `true`. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example `/home/user/.bashrc` would turn into `home/user/.bashrc`. This logic was insufficient when file paths contained repeated path roots such as `////home/user/.bashrc`. `node-tar` would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. `///home/user/.bashrc`) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. Users may work around this vulnerability without upgrading by creating a custom `onentry` method which sanitizes the `entry.path` or a `filter` method which removes entries with absolute paths. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar.

CVSS Metrics

  • v3.1•HIGH•Score: 8.2CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
  • v3.1•HIGH•Score: 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
  • v2.0•MEDIUM•Score: 5.8AV:N/AC:M/Au:N/C:N/I:P/A:P

EPSS Trends

Current EPSS score: 84.98%• Percentile: 99%

Techniques & Countermeasures

  • CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

    The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected Systems

  • npm•node-tar

    < 3.2.2 | ≥ 4.0.0, < 4.4.14 | ≥ 5.0.0, < 5.0.6 | ≥ 6.0.0, < 6.1.1

  • Npm•tar

    < 3.2.2 | ≥ 4.0.0, < 4.4.14 | ≥ 5.0.0, < 5.0.6 | ≥ 6.0.0, < 6.1.1

  • oracle•graalvm

    20.3.3 | 21.2.0

  • siemens•sinec_infrastructure_network_services

    < 1.0.1.1

  • tar_project•tar

    < 3.2.2 | ≥ 4.0.0, < 4.4.14 | ≥ 5.0.0, < 5.0.6 | ≥ 6.0.0, < 6.1.1

References (8)