Microsoft Excel users should avoid opening or saving any file attachments sent via e-mail if the message is not from a trusted source or arrives unexpectedly, the company said following public reports of zero day attacks exploiting a flaw in the spreadsheet program. Security firm Secunia ranks the vulnerability as extremely critical because it can allow a hacker to remotely gain access to a user’s computer system. To launch an attack, a user must first open a malicious Office file sent by e-mail or otherwise provided to them via the Internet.
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