Symantec AMS Intel Alert Handler Modem String Parsing Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Symantec Alert Management System. Authentication is not required to exploit this vulnerability. The specific flaw exists within the pagehndl.dll module while processing data sent from the msgsys.exe process which listens by default on TCP port 38292. The DLL allocates a fixed length stack buffer and subsequently copies a user-supplied modem string without validating the size. By supplying a large enough value this buffer can be overflowed leading to arbitrary code execution under the context of the vulnerable daemon.