FYI...
Microsoft Security Advisory (921365)
Vulnerability in Excel Could Allow Remote Code Execution
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http://www.microsoft...ory/921365.mspx
Published: June 19, 2006
"Microsoft is investigating new public reports of limited “zero-day” attacks using a vulnerability in Microsoft Excel 2003, Excel Viewer 2003, Excel 2002, Excel 2000, Microsoft Excel 2004 for Mac, and Microsoft Excel v. X for Mac. In order for this attack to be carried out, a user must first open a malicious Excel file attached to an e-mail or otherwise provided to them by an attacker. Opening the Excel document out of email will prompt the user to be careful about opening the attachment. As a best practice, users should always exercise extreme caution when opening unsolicited attachments from both known and unknown sources. Microsoft has added detection to the Windows Live Safety Center today for up-to-date removal of malicious software that attempts to exploit this vulnerability. Microsoft is also actively sharing information with Microsoft Security Response Alliance partners so that their detection can be up to date to detect and remove attacks...
Mitigating Factors for Microsoft Excel Remote Code Execution Vulnerability:
• An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate with administrative user rights.
• On Excel 2002 and Excel 2003, the vulnerability could not be exploited automatically through e-mail. For an attack to be successful a user must accept a prompt confirming that they Open, Save or Cancel the attachment that is sent in an e-mail message before the exploit could occur.
• This vulnerability could not be exploited automatically through a Web-based attack scenario. An attacker would have to host a Web site that contains an Office file that is used to attempt to exploit this vulnerability. An attacker would have no way to force users to visit a malicious Web site. Instead, an attacker would have to persuade them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site.
Note: Excel 2000 does not prompt the user to Open, Save, or Cancel before opening a document..."
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