Microsoft Says It Has Fixed Internet Explorer Flaw

Microsoft Corp said it has fixed a security bug in Internet Explorer that hackers exploited to attack some customers.

The attacks prompted the German government and security experts to urge people to temporarily stop using the browser.

The software maker said that the permanent repair to the software, used by hundreds of millions of people, would be released on Friday. A majority of Microsoft Windows users have their computers set to automatically download that update.

Microsoft spokeswoman Yunsun Wee said in a statement that “the vast majority” of Internet Explorer users had not been attacked as a result of the security flaw.

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The vulnerability in Internet Explorer was identified by a Luxembourg-based security researcher. His computer was infected while analysing a computer server used last year to launch a cyber industrial espionage campaign on dozens of chemical makers and defense contractors.

Network security firm AlienVault said that it had discovered three other servers that hosted malicious websites that exploited the Internet Explorer flaw. It said the latest round of attacks targeted defense contractors, not the general public.

Internet Explorer was the world’s second-most widely used browser last month, with about a 33 percent market share, according to StatCounter. It was close behind Chrome, which had 34 percent of the market.