Arbitrary File Write via Archive Extraction (Zip Slip) Affecting github.com/mholt/archiver/cmd/arc package, versions >=3.0.0 <3.3.2


Severity

Recommended
0.0
medium
0
10

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

Threat Intelligence

EPSS
0.15% (52nd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-GOLANG-GITHUBCOMMHOLTARCHIVERCMDARC-174728
  • published16 May 2019
  • disclosed13 May 2019
  • creditGiulio Comi

Introduced: 13 May 2019

CVE-2019-10743  (opens in a new tab)
CWE-29  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade github.com/mholt/archiver/cmd/arc to version 3.3.2 or higher.

Overview

github.com/mholt/archiver/cmd/arc is a cross-platform, multi-format archive utility and Go library.

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

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