Microsoft has known about Internet Explorer bug from Google Hack since September 2009.
A critical security flaw in Internet Explorer 6 played a role in the hacking of many top tech firms, including Google, which lead to the current drama between the U.S. search giant and China.
Microsoft yesterday released the update that should patch the hole in Internet Explorer 5.01, Internet Explorer 6, Internet Explorer 6 Service Pack 1, Internet Explorer 7, and Internet Explorer 8. Those who have Automatic Updates enabled should be able to find the update through that means, otherwise it can be downloaded here.
Interestingly, Kaspersky Labs Threatpost reports that Microsoft learned of this security hole back in September 2009 and planned for a patch in February 2010, but the company had to accelerate its plans in light of the recent hacking of Google.