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Windows 7 Zero day exploit reported

Windows 7 Zero day exploit reported

Laurent Gaffie has found a new bug which crashes a Windows 7 system when exploited. The issue revolves around the SMB (Server Message Block) protocol that forms the core structure of Windows File Sharing. When this is triggered it results in an infinity loop which crashes the system.

Lead Security Research Engineer with nCircle Tyler Reguly publically stated “Exploitation of this vulnerability occurs when a user attempts to browse to Windows Share hosted on the malicious server. On Windows 7, the DoS (denial of service) will occur as soon as you type ” in the search box.”

This is a problem for both Windows 7 and Windows Server 2008 R2 and while there are currently a few exploits already circulating there have been no reports of them being active at this time. The only good news is that this flaw doesnt enable an attacker to gain access to a system, it just means the person at the other end couldn’t use it either.

To help protect yourself until Microsoft fix this issue you can block TCP ports from 135 to 139 and port 445 will prevent outside SMB traffic from entering the network.

As we always say, the use of a good hardware firewall between your computer and your cable or DSL connection is always a wise choice.

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Stuart Davidson

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