The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.2.2 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.
HIGH Vulnerable Package issue exists @ tar in branch main
Description
The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.2.2 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 totrue
. 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 intohome/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 customonentry
method which sanitizes theentry.path
or afilter
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.HIGH Vulnerable Package issue exists @ tar in branch main
Vulnerability ID: CVE-2021-32804
Package Name: tar
Severity: HIGH
CVSS Score: 8.1
Publish Date: 2021-08-03T19:15:00
Current Package Version: 6.1.0
Remediation Upgrade Recommendation: 6.1.9
Link To SCA
Reference – NVD link