Users are being urged to upgrade to the latest versions of the Mozilla and Firefox browsers because of newly discovered security holes.
Internet security company iDefense has found that older versions of the browsers can allow a hacker to create what is described as a "memory heap overflow" via both browsers and remotely take control of a user’s PC.
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The open source Mozilla Foundation has admitted that there is a potential problem and recommends that users update to the latest versions of its browsers - Mozilla 1.7.6 and the just released Firefox 1.0.1.
Firefox 1.0.1 was released to address a different security flaw related to the way it handled international website domains.
Anti-virus company Trend Micro also admitted last week there were heap overflow vulnerabilities in some of its software products.
New versions of the browsers can be downloaded for free from www.mozilla.org