Responding to an alert from the Department of Homeland Security, Oracle announced fixes for two newly discovered flaws in its Java Web browsing software. According to one research group, Java was responsible for half of all cyberattacks in 2012 that involved an exploited software bug. Last week, the DHS and security researchers said they had identified vulnerabilities in the software that allow hackers to install malicious code on PCs using phishing attacks or by luring users to infected websites.

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