#VU58205 Absolute Path Traversal in tar - CVE-2021-32804
Published: November 17, 2021
Vulnerability identifier: #VU58205
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-32804
CWE-ID: CWE-36
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
tar
tar
Software vendor:
npm Inc.
npm Inc.
Description
The vulnerability allows a remote attacker to overwrite arbitrary files on the system.
The vulnerability exists due to a logic issue 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.
Remediation
Install update from vendor's website.