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Windows 7: Microsoft confirms first Windows 7 zero-day bug

14 Nov 2009   #1

Windows 7 Ultimate x64, XP Mode, W8.1 Preview VM - 7 Pro x64 second remote tower
 
 
Microsoft confirms first Windows 7 zero-day bug

Quote:
Microsoft confirms first Windows 7 zero-day bug

Urges users to block ports until a patch is ready, but workaround cripples browsers

By Gregg Keizer
November 14, 2009 08:11 AM ET

Computerworld - Microsoft late on Friday confirmed that an unpatched vulnerability exists in Windows 7, but downplayed the problem, saying most users would be protected from attack by blocking two ports at the firewall.

In a security advisory, Microsoft acknowledged that a bug in SMB (Server Message Block), a Microsoft-made network file- and print-sharing protocol, could be used by attackers to cripple Windows 7 and Windows Server 2008 R2 machines.

The zero-day vulnerability was first reported by Canadian researcher Laurent Gaffie last Wednesday, when he revealed the bug and posted proof-of-concept attack code to the Full Disclosure security mailing list and his blog. According to Gaffie, exploiting the flaw crashes Windows 7 and Server 2008 R2 systems so thoroughly that the only recourse is to manually power off the computers.
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