The security update fixes six memory corruption vulnerabilities and issues in handling of URL validations. It is also believed that MS has also included patch in same update for a flaw used by attackers targeting Google and other major corporations recently.
In past few weeks there has been increase in attacks using the vulnerability by posting of malicious web pages that exploit the vulnerabilities. We had been monitoring the live situation and updating our browsing protection to make sure our users are blocked from visiting such pages. It was observed that the web pages exploiting the latest vulnerability in IE are more concentrated towards Chinese users.
We recommend all our users to upgrade to the latest version of Internet Explorer.