Arbitrary File Write via Archive Extraction (Zip Slip) Affecting org.eclipse.rdf4j:rdf4j-util package, versions [,2.4.3)
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Test your applications- Snyk ID SNYK-JAVA-ORGECLIPSERDF4J-72708
- published 20 Dec 2018
- disclosed 18 Dec 2018
- credit Unknown
Introduced: 18 Dec 2018
CVE-2018-20227 Open this link in a new tabHow to fix?
Upgrade org.eclipse.rdf4j:rdf4j-util to version 2.4.3 or higher.
Overview
org.eclipse.rdf4j:rdf4j-util is the client code repository for the Eclipse RDF4J project. It contains the main client-facing APIs and the various Rio parser and writer modules.
Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). It allows Directory Traversal via ../ in an entry in a ZIP archive.
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