Microsoft announced it was considering a major flaw in Windows 7 and Server 2008 R2 can crash a computer remotely.

Planting Windows in one second

The problem has been updated by Laurant Gaffié who published a proof of concept showing that it was possible to crash the kernel of those operating systems remotely by sending a NetBIOS header writing that the SMB package is more or less big it actually is while establishing an infinite loop protocol Server Message Block (SMB) in charge of Windows file sharing. The operating system will then freeze completely, without even presenting a blue screen or indicate that something is wrong and even after restarting the machine, the logs show no problem.

Microsoft's response

According to the developer, it is possible to exploit this bug, whatever the configuration of your firewall. Security experts have created a site that has since been removed, exploiting this vulnerability successfully. Meanwhile, Microsoft, which acknowledged the problem says Gaffié said he might need to wait until Windows 7 SP1 that this flaw is filled (see "Already an SP1 for Windows 7).