macOS 10.14.3 iOS 12.1.3 - Arbitrary mach Port Name Deallocation in XPC Services due to Invalid mach Message Parsing in _xpc_serializer_unpack

macOS 10.14.3 iOS 12.1.3 - Arbitrary mach Port Name Deallocation in XPC Services due to Invalid mach Message Parsing in xpcserializerunpack / xpcserializerunpack in libxpc parses mach messages which contain xpc messages. There are two reasons for an xpc mach message to contain descriptors: if the...