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New attacks leverage unpatched IE flaw, Microsoft warns
- — 12 March, 2011 17:32
An Internet Explorer flaw made public by a Google security researcher two months ago is now being used in online attacks.
The flaw, which has not yet been patched, has been used in "limited, targeted attacks," Microsoft said Friday in an update to its security advisory on the issue.
Google concurred, and offered a few more details. "We've noticed some highly targeted and apparently politically motivated attacks against our users," Google said in blog post. "We believe activists may have been a specific target. We've also seen attacks against users of another popular social site."
The attack is triggered when the victim is tricked into visiting a maliciously encoded Web page -- what's known as a Web drive-by attack. It gives the attacker a way of hijacking the victims browser and accessing Web applications without authorization.
The flaw lies in the Windows mshtml.dll software library used by Internet Explorer, and affects all currently supported versions of Windows.
Microsoft has released a Fixit tool that users can download to repair the problem, but has not said when, or even if, it plans to push out a comprehensive security update to all users.
The bug has been a bone of contention between Google and Microsoft. On January 1, Google engineer Michal Zalewski released a hacking tool that could be used to find the bug, along with some technical details, saying that he was concerned that Chinese hackers may have already discovered the problem. He said that he warned Microsoft about the flaw back in July. Microsoft maintains that it was unable to reproduce the problem until December.
Google isn't saying who exactly was targeted in this latest incident, but Chinese activist groups have been the focus of cyber attacks in the past. This may be another example of an ongoing and methodical effort to track and steal information from pro-democracy and Tibetan activists.
Zalewski referred an inquiry to Google's public relations team, which declined to comment further on the matter.
Now that the flaw is being exploited in attacks, the pressure is mounting on Microsoft to produce a reliable patch for the issue that can be pushed out to hundreds of millions of customers.
"For now, we recommend concerned users and corporations seriously consider deploying Microsoft's temporary Fixit to block this attack until an official patch is available," Google said.