Arbitrary File Write via Archive Extraction (Zip Slip) Affecting me.raynes:fs package, versions [0,]


Severity

Recommended
0.0
critical
0
10

CVSS assessment by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of Concept

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  • Snyk IDSNYK-JAVA-MERAYNES-32379
  • published19 Jun 2018
  • disclosed19 Jun 2018
  • creditDan Lebrero

Introduced: 19 Jun 2018

CVE NOT AVAILABLE CWE-29  (opens in a new tab)

How to fix?

There is no fix version for me.raynes:fs

Overview

me.raynes:fs is a File system utilities for Clojure.

Affected versions of the package are vulnerable to Arbitrary File Write via Archive Extraction (AKA "Zip Slip").

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