Arbitrary File Write via Archive Extraction (Zip Slip) Affecting org.apache.solr:solr-core package, versions [6.6,9.8.0)

org.apache.solr:solr-core is an open source enterprise search platform built on Apache Lucene

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) in the uploadFileToConfig() function in the FileSystemConfigSetService.java component, which is accessible via the configset upload API. An attacker can write files at unintended paths in the filesystem by passing in a ZIP archive containing a malicious pathname.

Note: This vulnerability is only exploitable on Windows systems.

This vulnerability can be avoided by adding a rule to the Rule-Based Authentication Plugin to restrict access to the target filesystem.

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

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