Microsoft Exchange Server ChainedSerializationBinder Deny List Typo RCE

This vulnerability allows remote attackers to execute arbitrary code
on Exchange Server 2019 CU10 prior to Security Update 3, Exchange Server 2019 CU11
prior to Security Update 2, Exchange Server 2016 CU21 prior to
Security Update 3, and Exchange Server 2016 CU22 prior to
Security Update 2.

Note that authentication is required to exploit this vulnerability.

The specific flaw exists due to the fact that the deny list for the
ChainedSerializationBinder had a typo whereby an entry was typo'd as
System.Security.ClaimsPrincipal instead of the proper value of
System.Security.Claims.ClaimsPrincipal.

By leveraging this vulnerability, attacks can bypass the
ChainedSerializationBinder's deserialization deny list
and execute code as NT AUTHORITY\SYSTEM.

Tested against Exchange Server 2019 CU11 SU0 on Windows Server 2019,
and Exchange Server 2016 CU22 SU0 on Windows Server 2016.