Hackers have released software that exploits a recently disclosed flaw in the Domain Name System (DNS) software used to route messages between computers on the internet, reports PC World--making it imperative that school IT staff and others patch their DNS servers if they haven't already. Internet security experts warn that this code could give criminals a way to launch virtually undetectable phishing attacks against internet users whose service providers have not installed the latest DNS server patches. Attackers also could use the code to silently redirect users to fake software update servers in order to install malicious software on their


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