Users could face a "highly critical" risk if they have both IE and Firefox version 2.0, or later, loaded on their computer. The trouble begins when browsing a malicious site while using IE and it registers a "firefoxurl://" URI (uniform resource identifier) handler, which allows the browser to interact with specific resources on the Web. As a result, users may find their systems remotely compromised.
Earlier Tuesday, security researcher Thor Larholm, who discovered the IE flaw, and security research giant Symantec put much of the blame on IE, while Secunia's Thomas Kristensen, chief technology officer, attributed the problem to Firefox versions 2.0 or later. "It's a little bit of both," said Oliver Friedrichs, director of Symantec's Security Response Center. "You have two very complex applications that are not playing well together and leading to a security issue. The components themselves are secure as stand-alone products but not together."
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