A Canadian security company is warning of a vulnerability affecting the filtering system of Microsoft's Hotmail, in which millions of e-mail boxes are potentially open to hackers. Neurocom issued a warning over a security hole involving a malicious program known as a Trojan horse, which passes itself off as another application. In this case, potential hackers could use the Trojan horse, written in HTML (Hypertext Markup Language), to create a "perfect replica" of Hotmail's re-login page, according to Neurocom. The company said that other sites providing Web-based e-mail may also be vulnerable to a similar attack. "It's a new instance of an old problem," said Elias Levy, chief technology officer for SecurityFocus.com. "It's another way to get passed those filters, and it's probably not going to be the last."
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