Arbitrary File Write via Archive Extraction (Zip Slip) Affecting org.pf4j:pf4j package, versions [0,3.10.0)


Severity

Recommended
0.0
high
0
10

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

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.42% (74th percentile)

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  • Snyk IDSNYK-JAVA-ORGPF4J-5862950
  • published29 Aug 2023
  • disclosed28 Aug 2023
  • creditUnknown

Introduced: 28 Aug 2023

CVE-2023-40828  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

Upgrade org.pf4j:pf4j to version 3.10.0 or higher.

Overview

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) via the expandIfZip method in the extract function. An attacker can obtain sensitive information and execute arbitrary code by exploiting this method.

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