Arbitrary File Write via Archive Extraction (Zip Slip) Affecting github.com/cloudfoundry/archiver/extractor package, versions <0.1.0


Severity

Recommended
0.0
critical
0
10

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

Threat Intelligence

Exploit Maturity
Mature
EPSS
0.12% (47th percentile)

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  • Snyk IDSNYK-GOLANG-GITHUBCOMCLOUDFOUNDRYARCHIVEREXTRACTOR-1293212
  • published10 Jun 2018
  • disclosed27 May 2018
  • creditM. Hanselmann

Introduced: 27 May 2018

CVE-2018-25046  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

Upgrade github.com/cloudfoundry/archiver/extractor to version 0.1.0 or higher.

Overview

github.com/cloudfoundry/archiver/extractor is an utility for extracting and compressing tgz and zip files.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) due to improper path sanitization, which makes it possible for archives containing relative file paths can cause files to be written (or overwritten) outside of the target directory.

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

References

CVSS Scores

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