What a surprise... Ok, I was kinda surprised. I guess this is why we have firewalls.
Microsoft Security Advisory (977544): Vulnerabilities in SMB Could Allow Denial of Service: "Revision Note: V1.0 (November 13, 2009): Advisory published.Summary: Microsoft is investigating new public reports of a possible denial of service vulnerability in the Server Message Block (SMB) protocol. This vulnerability cannot be used to take control of or install malicious software on a user’s system. However, Microsoft is aware that detailed exploit code has been published for the vulnerability. Microsoft is not currently aware of active attacks that use this exploit code or of customer impact at this time. Microsoft is actively monitoring this situation to keep customers informed and to provide customer guidance as necessary."