Microsoft Security Bulletin MS12-063 - Critical

Cumulative Security Update for Internet Explorer (2744842)

Version: 1.0

Microsoft has published an out-of-band security bulletin—MS12-063—to address a vulnerability that is being actively exploited in attacks in the wild. In addition, Microsoft also released an update to resolve a critical flaw in Adobe Flash in Internet Explorer 10—which is the default browser in Windows 8 and Windows Server 2012. Microsoft has responded quickly in its investigation of reports that a zero-day vulnerability in Internet Explorer is being actively exploited. Microsoft issued a security advisory with workarounds, and mitigating factors to help customers guard against attacks pending a fix. Then, it released a one-click Fix-It tool to protect customers while kicking its developers in to high gear to create a more permanent fix.

Executive Summary

This security update resolves one publicly disclosed and four privately reported vulnerabilities in Internet Explorer. The most severe vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited any of these vulnerabilities could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
This security update is rated Critical for Internet Explorer 6, Internet Explorer 7, Internet Explorer 8, and Internet Explorer 9 on Windows clients and Moderate for Internet Explorer 6, Internet Explorer 7, Internet Explorer 8, and Internet Explorer 9 on Windows servers. Internet Explorer 10 is not affected. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by modifying the way that Internet Explorer handles objects in memory. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

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Microsoft squashes some bugs in Internet
Explorer with new patches released today.
Andrew Storms, director of security operations for nCircle, praised Microsoft’s quick turnaround, but he also feels there is more on the line than just protecting customers from attacks. “Microsoft had to respond very quickly to this bug. In addition to the serious security threats it posed to their customers, Internet Explorer’s market share is at risk. Many security pundits and organizations have been telling users to switch browsers until a patch is available. I'm sure that got the attention of a lot of Microsoft executives.”

To Microsoft’s credit, this is the first “zero-day” to hit Internet Explorer in nearly two years. It seems like it was once a much more common occurrence, and that ocnce upon a time Microsoft wasn’t this good at cranking out the fix. Microsoft has come a long way in improving its own response to identified security issues, and in setting the bar for other software vendors to strive for.
Separate from the MS12-063 patch, which applies to Internet Explorer 7, 8, and 9, Microsoft also addressed a critical security issue in Internet Explorer 10. There are updates available for both 32-bit and 64-bit Windows 8, and for Windows Server 2012 to fix issues in Adobe Flash code embedded in Internet Explorer 10.
In previous versions of Internet Explorer, Adobe Flash is treated as a separate, standalone application. That software is updated by Adobe, and the patch is traditionally applied outside of the Windows Update or Microsoft Patch Tuesday processes. However, because Flash is now embedded in Internet Explorer 10, the burden falls on Microsoft to develop and release the appropriate patch.
If you have Automatic Updates enabled, you don’t need to do anything. However, if you don’t have Automatic Updates enabled, you should download and apply these updates as soon as possible.