Arbitrary File Write via Archive Extraction (Zip Slip) Affecting aws-cdk package, versions >=0.8.0 <1.111.0 >=2.0.0-alpha.1 <2.0.0-rc.12
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Test your applications- Snyk ID SNYK-JS-AWSCDK-2413656
- published 25 Feb 2022
- disclosed 24 Feb 2022
- credit Unknown
How to fix?
Upgrade aws-cdk
to version 1.111.0, 2.0.0-rc.12 or higher.
Overview
aws-cdk is a CDK Toolkit, the command line tool for CDK apps
Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) via zips from untrusted sources, which might be able to execute arbitrary code in the scope and permissions of the Lambda Function used by this module, to read or write unexpected files in the S3 bucket.
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