Authentication is not required to exploit this vulnerability.
The specific flaw exists in a function responsible for assembling an HTTP response. The following modules implement this functionality: gwpoa.exe, gwmta.exe, gwia.exe. When responding to an HTTP request sent to TCP port 7101 or 7100 or in the case of gwia.exe the user configured "Message Transfer Port", the process uses the client-specified "Host: " header to create an HTTP 301 redirection message. Within this code a local stack buffer is used to store the redirect location and can be overflown with a sufficiently long header value. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the SYSTEM user.
