Arbitrary File Write via Archive Extraction (Zip Slip) Affecting react-native-code-push package, versions >=1.7.0 <6.3.0
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Test your applications- Snyk ID SNYK-JS-REACTNATIVECODEPUSH-173775
- published 11 Mar 2019
- disclosed 18 May 2018
- credit shawnXiao
How to fix?
Upgrade react-native-code-push to version 6.3.0 or higher.
Overview
react-native-code-push provides client-side integration for the CodePush service, allowing you to easily add a dynamic update experience to your React Native app(s).
Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip).
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