Security firm Secunia - has rated a problem in Microsoft Excel as 'Extremely critical'. As you would have expected it can be exploited by men with malicious minds to compromise a system. It is something that is connected with file handling in Excel, but the exact specification is still unknown. The vulnerability can be exploited if the attacker creates a special excel file that has malfunctioning header information. Successful exploitation leads to arbitrary code running in the victim's computer. As of now there is no specific solution to this problem. Please do not open mails containing Excel files, unless you know the sender and have spoken to him regarding the file.
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