Arbitrary File Write via Archive Extraction (Zip Slip) Affecting dotnetzip package, versions [,1.11.0)
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Test your applications- Snyk ID SNYK-DOTNET-DOTNETZIP-60245
- published 31 May 2018
- disclosed 17 Apr 2018
- credit Snyk Security research Team
Introduced: 17 Apr 2018
CVE-2018-1002205 Open this link in a new tabHow to fix?
Upgrade dotnetzip to version 1.11.0 or higher.
Overview
dotnetzip is a class library and toolset for manipulating 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