Arbitrary File Write via Archive Extraction (Zip Slip) Affecting uk.ac.ed.ph.qtiworks:qtiworks-engine package, versions [0,]


Severity

Recommended
0.0
high
0
10

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

Threat Intelligence

EPSS
0.06% (30th percentile)

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  • Snyk IDSNYK-JAVA-UKACEDPHQTIWORKS-3091011
  • published30 Oct 2022
  • disclosed30 Oct 2022
  • creditJLLeitschuh

Introduced: 30 Oct 2022

CVE-2022-39367  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

A fix was pushed into the master branch but not yet published.

Overview

uk.ac.ed.ph.qtiworks:qtiworks-engine is a QTIWorks delivery engine.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). The ZIP handling code does not sufficiently check the paths of files contained within ZIP files, so can insert files into other locations in the filesystem if they are writable by the process running the QTIWorks Engine.

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 Scores

version 3.1