Microsoft Office Hyperlink Signing Weakness

Bugtraq ID:	26857
Class:	Design Error
CVE:
Remote:	Yes
Local:	No
Published:	Dec 13 2007 12:00AM
Updated:	Dec 14 2007 02:12PM
Credit:	Henrich C. Poehls, Dong Tran, Finn Petersen, and Frederic Pscheid from the Department of Informatics at the University of Hamburg are credited with the discovery of this issue.
Vulnerable:	Microsoft Office 2007 0 + Microsoft Access 2007 0 + Microsoft Access 2007 0 + Microsoft Excel 2003 + Microsoft Excel 2007 0 + Microsoft Excel 2007 0 + Microsoft FrontPage 2003 + Microsoft Groove 2007 0 + Microsoft Groove 2007 0 + Microsoft InfoPath 2003 + Microsoft InfoPath 2007 0 + Microsoft InfoPath 2007 0 + Microsoft Office Communicator 2007 0 + Microsoft Office Communicator 2007 0 + Microsoft OneNote 2003 0 + Microsoft Outlook 2003 0 + Microsoft Outlook 2007 0 + Microsoft Outlook 2007 0 + Microsoft PowerPoint 2003 0 + Microsoft PowerPoint 2007 0 + Microsoft PowerPoint 2007 0 + Microsoft Project Professional 2007 0 + Microsoft Project Professional 2007 0 + Microsoft Project Standard 2007 0 + Microsoft Project Standard 2007 0 + Microsoft Publisher 2003 + Microsoft Publisher 2007 0 + Microsoft Publisher 2007 0 + Microsoft SharePoint Designer 2007 0 + Microsoft SharePoint Designer 2007 0 + Microsoft Visio Professional 2007 0 + Microsoft Visio Professional 2007 0 + Microsoft Visio Standard 2007 0 + Microsoft Visio Standard 2007 0
Not Vulnerable:

Microsoft Office Hyperlink Signing Weakness

Microsoft Office fails to securely sign Office documents properly.

Attackers can leverage this weakness to manipulate signed documents in a manner such that the signature remains intact.

The weakness will result in a false sense of security and could help attackers exploit other latent vulnerabilities.

Microsoft Office 2007 is vulnerable; other versions may also be affected.

Microsoft Office Hyperlink Signing Weakness

An attacker can exploit this issue using readily available text-editing utilities.

Microsoft Office Hyperlink Signing Weakness

Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Microsoft Office Hyperlink Signing Weakness

References:

• Microsoft Office Product Homepage (Microsoft)
  
• MS Office 2007: Target of Hyperlinks not covered by Digital Signatures ([email protected])