Microsoft Corp. has issued a patch for the first serious vulnerability to be found in the Windows Server 2003 software, which company officials have said is their most secure OS yet. Although this is actually the fourth flaw to affect Windows 2003, it is the first one to be rated critical. The others were rated moderate risks because they didn’t affect default configurations of the software. This vulnerability is found in a portion of the Remote Procedure Call (RPC) protocol that handles message exchanges over TCP/IP. The vulnerability, which arises because of incorrect handling of error messages, affects a particular Distributed Component Object Model interface with RPC. Full Story