Arbitrary File Write via Archive Extraction (Zip Slip) Affecting io.kubernetes:client-java package, versions [0, 9.0.1) [10.0.0, 10.0.1)


0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
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NVD
7.5 high

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  • Snyk ID SNYK-JAVA-IOKUBERNETES-1061916
  • published 18 Jan 2021
  • disclosed 21 Dec 2020
  • credit brendandburns

How to fix?

Upgrade io.kubernetes:client-java to version 9.0.1, 10.0.1 or higher.

Overview

io.kubernetes:client-java is a Client Java package.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). Path normalization is not done for archive files which can lead to path traversal via Zip archives.

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