With the prior knowledge in mind, I come up with a simple idea. It’s common to see multiple Exchange Servers in corporate networks for high availability and site resilience. Can we relay the NTLM authentication among Exchange Servers?
ProxyShell: The exploit chain we demonstrated at Pwn2Own 2021 to take over Exchange and earn $200,000 bounty
ProxyOracle! The attack on Exchange Server to recover any user's password in plaintext format
ProxyLogon! The most severe and impactful vulnerability in the Exchange Server history ever.
