Microsoft Exchange Privilege Escalation Exploit

This module exploits a privilege escalation vulnerability found in Microsoft Exchange - CVE-2019-0724
Execution of the module will force Exchange to authenticate to an arbitrary URL over HTTP via the Exchange PushSubscription feature.
This allows us to relay the NTLM authentication to a Domain Controller and authenticate with the privileges that Exchange is configured.
The module is based on the work by @_dirkjan,