Out of Band Security Fix, Please Take Action Now – Bulletin MS12-063 – Critical

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Rob Waggoner



Friday we released an Out of Band security fix for Internet Explorer.  This fix covers IE 6, 7, 8 & 9 and it is a critical fix.  We don’t release normal fixes Out of Band and we recognize how difficult it is for our partners and customers to react to a release like this, but please take time to review this fix now and assemble a plan to see its deployed to your customers.

Microsoft Security Bulletin MS12-063 - Critical

Cumulative Security Update for Internet Explorer (2744842)

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.

This security update also addresses the vulnerability first described in Microsoft Security Advisory 2757760.

The Microsoft Security Response Center (MSRC) site is another good site to keep up with:



For your customers that have automatic updating enabled, they will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

Be sure to review the FAQ section, especially if you already deployed this workaround for Security Advisory 2757750

If I applied the automated Microsoft Fix it solution for Internet Explorer in Microsoft Security Advisory 2757760, do I need to undo the workaround before applying this update?
Customers who implemented the Microsoft Fix it solution, "Prevent Memory Corruption via ExecCommand in Internet Explorer," in Microsoft Security Advisory 2757760, do not need to undo the Microsoft Fix it solution before applying this update.

Until next time,



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