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Arbitrary File Write via Archive Extraction (Zip Slip) Affecting github.com/cloudfoundry/archiver/extractor Open this link in a new tab package, versions

0.0
critical

  • Exploit Maturity

    Mature

  • Attack Complexity

    Low

  • Integrity

    High

  • Availability

    High

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  • snyk-id

    SNYK-GOLANG-GITHUBCOMCLOUDFOUNDRYARCHIVEREXTRACTOR-1293212

  • published

    10 Jun 2018

  • disclosed

    27 May 2018

  • credit

    M. Hanselmann

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Introduced: 27 May 2018

CWE-29 Open this link in a new tab

Overview

code.cloudfoundry.org/archiver is Utilities for extracting and compressing tgz and zip 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

Remediation

Upgrade code.cloudfoundry.org/archiver to hash 09b5706aa9367972c09144a450bb4523049ee840.

References