Arbitrary File Write via Archive Extraction (Zip Slip) Affecting decompress-zip package, versions <0.2.2 >=0.3.0 <0.3.2


Severity

Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team

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  • Snyk ID SNYK-JS-DECOMPRESSZIP-73598
  • published 24 Jan 2019
  • disclosed 16 Jan 2019
  • credit Unknown

Introduced: 16 Jan 2019

CVE NOT AVAILABLE CWE-29 Open this link in a new tab

How to fix?

Upgrade decompress-zip to version 0.2.2, 0.3.2 or higher.

Overview

decompress-zip extracts the contents of the ZIP archive file.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). The package will extract files outside of the scope of the specified target directory because there is no validation that file extraction stays within the defined target path.

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
Expand this section

Snyk

Recommended
9.8 critical
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High