Arbitrary File Write via Archive Extraction (Zip Slip) Affecting joomla/archive package, versions <1.1.12>=2.0.0, <2.0.1


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.82% (82nd percentile)

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  • Snyk IDSNYK-PHP-JOOMLAARCHIVE-2436656
  • published30 Mar 2022
  • disclosed30 Mar 2022
  • creditEgidio Romano

Introduced: 30 Mar 2022

CVE-2022-23793  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

Upgrade joomla/archive to version 1.1.12, 2.0.1 or higher.

Overview

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) via the Joomla\Archive\Tar::extract() function, as a result of improper verification of the destination path.

Details

It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:


+2018-04-15 22:04:29 ..... 19 19 good.txt

+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys

CVSS Base Scores

version 3.1