In September, based on additional research by the companies eEye Digital Security, NSFocus and Tenable Network Security, Microsoft reported two more buffer overflows and one denial-of-service vulnerability within its RPC protocol. The fact that it is similar to the first flaw could mean a shorter timeline to the next major RPC worm.
The Remote Procedure Call (RPC) is a protocol used by the Windows operating system. It's based on an RPC protocol from the Open Software Foundation, but it's the Microsoft-specific parts that are afflicted with vulnerabilities. The Distributed Component Model (DCOM), previously called Network Object Linking and Embedding (OLE), is a service that allows software on one computer to communicate directly with software on other computers over a network. In short, DCOM RPC in Windows allows a program on one machine to run code on another machine. To do so, a Windows computer must first listen on a dedicated port, usually 135.
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