Arbitrary File Write via Archive Extraction (Zip Slip) Affecting archive-tar-minitar package, versions <0.5.2


Severity

Recommended
0.0
high
0
10

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

Threat Intelligence

EPSS
0.55% (78th percentile)

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  • Snyk IDSNYK-RUBY-ARCHIVETARMINITAR-20337
  • published6 Mar 2017
  • disclosed21 Aug 2016
  • creditecneladis

Introduced: 21 Aug 2016

CVE-2016-10173  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

Upgrade archive-tar-minitar to version 0.5.2 or higher.

Overview

archive-tar-minitar is a pure-Ruby library that provides the ability to deal with POSIX tar(1) archive files.

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

Related to rubyzip and minitar.

CVSS Scores

version 3.1