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Microsoft Office 2003 "mailto:" Automatic Attachment of Arbitrary Files
Secunia Advisory: SA19819
Release Date: 2006-04-26
Last Update: 2006-04-28
Popularity: 23,712 views

Critical:
Not critical
Impact: Manipulation of data
Exposure of sensitive information
Where: From remote
Solution Status: Unpatched

Software:Microsoft Office 2003 Professional Edition
Microsoft Office 2003 Small Business Edition
Microsoft Office 2003 Standard Edition
Microsoft Office 2003 Student and Teacher Edition

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CVE reference:CVE-2006-2055


Description:
Inge Henriksen has discovered a weakness in Microsoft Office 2003, which can be exploited by malicious people to disclose sensitive information.

The weakness is caused due to Microsoft Office Outlook registering an unsafe "mailto" URI handler. This can be exploited to automatically attach an arbitrary file to an e-mail by tricking a user into following a specially crafted link with the "mailto:" URI handler from a malicious web site.

Example:
mailto:[mail]""..\..\..\..\..\[file]

The weakness has been confirmed on a fully patched system with Microsoft Office Outlook 2003 SP1/SP2 and Microsoft Office 2003 Professional Edition. Other versions may also be affected.

Solution:
Validate attachments before sending e-mails after opening links with the "mailto:" URI handler.

Provided and/or discovered by:
Inge Henriksen

Changelog:
2006-04-28: Added CVE reference.


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