They're the dusty corners of the Web: so-called "parked" domains. But these little trafficked sites are attracting the attention of security experts, who say that its time for hosting firms and others that profit from them to clean up malware infections that may be exposing millions of Web users to attacks. The topic of what to do about the millions of parked domains was put back on the front burner this week after Web hosting firm Network Solutions acknowledged, on Monday, that unknown hackers had compromised a popular Web template it offered to customers, placing code in a widget to serve up malicious content from hundreds of thousands - perhaps millions of parked Web domains that the company manages. The company declined to say how long the sites had been serving the malicious content, but the mass compromise may go back more than eight months, to a breach that first came to light in January, 2010. The sites, registered by Network Solutions customers and then left to sit, don't garner much traffic individually. But collectively, they represent a significant piece of malicious Web traffic, according to experts at security firm Armorize, which uncovered the malicious widget and reported it to Network Solutions.

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