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Users of the Microsoft's Internet Explorer are being urged by experts to switch to a rival until a serious security flaw has been fixed.
The flaw in Microsoft's Internet Explorer could allow criminals to take control of people's computers and steal their passwords, internet experts say.
Microsoft urged people to be vigilant while it investigated and prepared an emergency patch to resolve it.
Internet Explorer is used by the vast majority of the world's computer users.
"Microsoft is continuing its investigation of public reports of attacks against a new vulnerability in Internet Explorer," said the firm in a security advisory alert about the flaw.
Microsoft says it has detected attacks against IE 7.0 but said the "underlying vulnerability" was present in all versions of the browser.
As many as 10,000 websites have been compromised since last week to take advantage of the security flaw, said antivirus software maker Trend Micro.
The websites have been mostly serving up programs that steal computer game passwords, but the flaw could be "adopted by more financially motivated criminals", a Trend Micro security researcher said on Monday.
PC Pro magazine's security editor, Darien Graham-Smith, said that there was a virtual arms race going on, with hackers always on the look out for new vulnerabilities.
"The message needs to get out that this malicious code can be planted on any web site, so simple careful browsing isn't enough."
"It's a shame Microsoft have not been able to fix this more quickly, but letting people know about this flaw was the right thing to do. If you keep flaws like this quiet, people are put at risk without knowing it."
"Every browser is susceptible to vulnerabilities from time to time. It's fine to say 'don't use Internet Explorer' for now, but other browsers may well find themselves in a similar situation," he added.
The flaw in Microsoft's Internet Explorer could allow criminals to take control of people's computers and steal their passwords, internet experts say.
Microsoft urged people to be vigilant while it investigated and prepared an emergency patch to resolve it.
Internet Explorer is used by the vast majority of the world's computer users.
"Microsoft is continuing its investigation of public reports of attacks against a new vulnerability in Internet Explorer," said the firm in a security advisory alert about the flaw.
Microsoft says it has detected attacks against IE 7.0 but said the "underlying vulnerability" was present in all versions of the browser.
As many as 10,000 websites have been compromised since last week to take advantage of the security flaw, said antivirus software maker Trend Micro.
The websites have been mostly serving up programs that steal computer game passwords, but the flaw could be "adopted by more financially motivated criminals", a Trend Micro security researcher said on Monday.
PC Pro magazine's security editor, Darien Graham-Smith, said that there was a virtual arms race going on, with hackers always on the look out for new vulnerabilities.
"The message needs to get out that this malicious code can be planted on any web site, so simple careful browsing isn't enough."
"It's a shame Microsoft have not been able to fix this more quickly, but letting people know about this flaw was the right thing to do. If you keep flaws like this quiet, people are put at risk without knowing it."
"Every browser is susceptible to vulnerabilities from time to time. It's fine to say 'don't use Internet Explorer' for now, but other browsers may well find themselves in a similar situation," he added.
Time to switch to Firefox
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