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Patches 31 vulnerabilities, including bug used in Pwn2Own hacking contest to break IE8

Computerworld - Microsoft today issued 10 security updates that patched a record 31 vulnerabilities in Windows, Internet Explorer (IE), Excel, Word, Windows Search and other programs, including 18 bugs marked "critical."

Of the 10 bulletins, six patched some part of Windows, while three patched an Office application or component, and one fixed a flaw in IE. Eighteen of the 31 bugs were ranked critical, Microsoft's most serious ranking in its four-step score, while 11 were tagged as "important," the next-lowest label, and two were judged "moderate."

The total bug count was the most patched by Microsoft in a single month since the company began regularly-scheduled updates in 2003. The previous record of 26 vulnerabilities patched occurred in both August 2008 and August 2006.

"This is a very broad bunch," said Wolfgang Kandek, chief technology officer at security company Qualys, "compared to last month, which was really all about PowerPoint. You've got to work everywhere, servers and workstations, and even Macs if you have them. It's not getting any better, the number of vulnerabilities [Microsoft discloses] continues to grow."

Security experts were all over the map when it came to naming which fixes to deploy first.

"IE's, by far, takes the cake," said Andrew Storms, director of security operations at nCircle Network Security. "It's a client-side bug, there are eight CVEs and there's no doubt that it will be exploited."

As Storms said, MS09-019 patches eight separate vulnerabilities in Microsoft's Internet Explorer browser. One of the patches finally plugs the hole that a researcher used in March 2009 to hack IE and walk off with a $5,000 prize at the "Pwn2Own" challenge.

"If you're running IE8 on Windows XP, or are concerned about intranet-based attacks, I would highly recommend putting this update on your high priority 'to do' list," said Terri Forslof, the manager of security response at 3Com's TippingPoint, the Pwn2Own sponsor, in an e-mail today.

Although users running IE8 on Vista or even Windows 7 are somewhat protected by that operating system from the exploit used to cash in at Pwn2Own, Windows XP users have been at risk for months, Forslof added.

The IE update also caught the eye of Kandek's colleague, Amol Sarwate, the manager of Qualys' vulnerability research lab. "What's interesting is that IE8 only has a single vulnerability," said Sarwate, talking about the Pwn2Own bug. "But IE7 has seven. That's one good reason to go to IE8."

Eric Schultze, chief technical officer at Shavlik Technologies, added two other updates to Storms' IE patch as his fix-first recommendation. "I'd equally patch the IIS, IE and Active Directory vulnerabilities," he said.


Microsoft sets record with monster Windows, IE, Office update

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