UnRAR Path Traversal in Zimbra (CVE-2022-30333)

This module creates a RAR file that can be emailed to a Zimbra server
to exploit CVE-2022-30333. If successful, it plants a JSP-based
backdoor in the public web directory, then executes that backdoor.

The core vulnerability is a path-traversal issue in unRAR that can
extract an arbitrary file to an arbitrary location on a Linux system.

This issue is exploitable on the following versions of Zimbra, provided
UnRAR version 6.11 or earlier is installed:

* Zimbra Collaboration 9.0.0 Patch 24 (and earlier)
* Zimbra Collaboration 8.8.15 Patch 31 (and earlier)