Zotob worm hole also affects Windows XP

By Joris Evers
http://news.com.com/Zotob+worm+hole+also+affects+Windows+XP/2100-1002_3-5842
359.html

Story last modified Tue Aug 23 18:45:00 PDT 2005



The plug-and-play vulnerability that caused havoc for Windows 2000 users
last week also holds a serious risk for some Windows XP users, Microsoft
said Tuesday.

Computers running Windows XP with Service Pack 1 in a specific configuration
are vulnerable to worm attacks similar to the ones that hit Windows 2000
systems, Microsoft said in a security advisory published Tuesday.

The Zotob worm and its offshoots, plus several other worms, downed Windows
2000 computers, including systems at ABC, CNN and The New York Times. All
the worms exploited a security hole in the plug-and-play feature in Windows,
for which Microsoft provided a fix earlier this month and rated as
"critical" for Windows 2000.

It was previously thought that only Windows 2000 machines were vulnerable to
remote attack using the plug-and-play flaw. However, Microsoft in its
security advisory on Tuesday specified one scenario that also exposes select
Windows XP users.

Also vulnerable are systems that run Windows XP with SP1 with file and
printer sharing and the Windows guest user account enabled, according to
Microsoft. This would likely be home users, because PCs are not vulnerable
if connected to a network domain, which is common in business environments,
Microsoft said.

"This is a minor and narrow attack scenario," said Debby Fry Wilson, a
director at Microsoft's Security Response Center. "However, because Windows
2000 customers were attacked last week, we wanted to take the extra
precaution of offering customers this clarifying information."

The probability that there are many vulnerable systems out there "is very
remote," Fry Wilson said. Most consumers have upgraded their Windows XP
machines to Service Pack 2, she said. In businesses, where Windows XP SP1 is
more common, computers are not vulnerable because they are typically
connected to a domain, she said.

Microsoft was made aware of the Windows XP attack possibility by security
vendor Symantec, Fry Wilson said. Microsoft urges users to apply the
security patches it provided earlier this month. Also, Microsoft is not
aware of any attack exploiting the plug-and-play flaw that targets Windows
XP.


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