Arbitrary File Write via Archive Extraction (Zip Slip) Affecting rc-zip package, versions *


Severity

Recommended
0.0
critical
0
10

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

Threat Intelligence

Exploit Maturity
Proof of concept

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  • Snyk IDSNYK-RUST-RCZIP-1277523
  • published29 Apr 2021
  • disclosed7 Feb 2021
  • creditUnknown

Introduced: 7 Feb 2021

CVE NOT AVAILABLE CWE-29  (opens in a new tab)

How to fix?

A fix was pushed into the master branch but not yet published.

Overview

rc-zip is a Pure rust zip & zip64 reading and writing.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). ZIP traversal through archive extraction is possible.

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

version 3.1