Arbitrary File Write via Archive Extraction (Zip Slip) Affecting adm-zip package, versions <0.4.11


Severity

Recommended
0.0
critical
0
10

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

Threat Intelligence

Exploit Maturity
Mature
EPSS
0.13% (49th percentile)

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  • Snyk IDnpm:adm-zip:20180415
  • published31 May 2018
  • disclosed14 Apr 2018
  • creditSnyk Security Research, Sébastien Mignot, Alex Chapman

Introduced: 14 Apr 2018

CVE-2018-1002204  (opens in a new tab)
CWE-29  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade adm-zip to version 0.4.11 or higher.

Overview

adm-zip is a JavaScript implementation for zip data compression for NodeJS.

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

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