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Web Sites Running On Windows NT At Risk Print E-mail
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Source: - Posted by Vincenzo Ciaglia   
Server Security Hundreds of thousands of Web sites running Windows NT 4 remain -- and will remain -- at risk from attack via a vulnerability patched for other operating systems a month ago, a U.S.-based security firm and a British-based Web monitoring vendor said Thursday. The bug in a key Windows protocol, Server Message Block (SMB), was patched for Windows XP, Windows Server 2003, and Windows 2000 in February, but because NT 4 had reached the end of its support lifecycle December 31, 2004, no public fix was issued by Microsoft. Microsoft does provide security patches for NT 4.0 customers who pay for custom support, a service available through the end of 2006.

However, that leaves a large number of Web sites vulnerable to hacks based on the SMB vulnerability, said Netcraft, a U.K.-based Web metrics and monitoring firm. According to Netcraft's most recent Web server survey, about 1.1 percent of Web-facing hostnames, or approximately 680,000, run on Windows NT 4.

Thousands of those hostnames, said Netcraft, are on SSL-enabled sites which may be conducting e-commerce, and thus particularly attractive to hackers.

"If your organization is unlucky enough to still have Windows NT 4.0 systems (most do) and you're not able to pay for extended support then you do not have a whole lot of options," wrote Marc Maiffret, the chief hacking officer at eEye Digital Security, in a message to the Bugtraq security mailing list.

Maiffret suggested a workaround that might mitigate some potential attacks. "...enable SMB signing. This does not truly mitigate the attack but instead it creates change in the SMB protocol that most attack tools I have seen do not support. Therefore it breaks them from being able to successfully exploit remote systems."

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