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Vulnerability of Microsoft Office: code execution via DLL Preload

Synthesis of the vulnerability 

An attacker can create a malicious DLL and invite the victim to open an Office document in the same directory, in order to execute code.
Vulnerable systems: Office, Access, Excel, Microsoft FrontPage, InfoPath, OneNote, Outlook, PowerPoint, Project, Publisher, Visio, Word, Visual Studio.
Severity of this threat: 3/4.
Creation date: 10/07/2012.
Références of this weakness: 2707960, BID-54303, CERTA-2012-AVI-376, CVE-2012-1854, MS12-046, VIGILANCE-VUL-11756.

Description of the vulnerability 

The Microsoft Office product loads the VBE6.DLL (Microsoft Visual Basic for Applications) library to open ".docx" files for example.

However, the library is loaded insecurely. An attacker can thus use the VIGILANCE-VUL-9879 vulnerability to execute code.

An attacker can therefore create a malicious DLL and invite the victim to open an Office document in the same directory, in order to execute code.
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This computer vulnerability impacts software or systems such as Office, Access, Excel, Microsoft FrontPage, InfoPath, OneNote, Outlook, PowerPoint, Project, Publisher, Visio, Word, Visual Studio.

Our Vigil@nce team determined that the severity of this weakness bulletin is important.

The trust level is of type confirmed by the editor, with an origin of intranet server.

An attacker with a expert ability can exploit this weakness.

Solutions for this threat 

Microsoft Office: patch for DLL Preload.
A patch is available:
Office 2003 SP3
  http://www.microsoft.com/downloads/details.aspx?familyid=d49c4893-d867-4d16-90f5-354eb4757d90
Office 2007 SP2, SP3
  http://www.microsoft.com/downloads/details.aspx?familyid=181bbd45-9128-4c26-af1e-fadfd83ff756
Office 2010 32 bit Gold, SP1
  http://www.microsoft.com/downloads/details.aspx?familyid=a7cc8fdc-1c64-434f-87a6-72ddcc356654
  http://www.microsoft.com/downloads/details.aspx?familyid=3050c06c-3cfc-4ce7-83cd-017d0922d597
Office 2010 64 bit Gold, SP1
  http://www.microsoft.com/downloads/details.aspx?familyid=ab442918-8184-4c7c-84b0-5a3635fdb005
  http://www.microsoft.com/downloads/details.aspx?familyid=0a8af868-abf7-4aeb-813a-418a04b31608
Microsoft Visual Basic for Applications
  http://www.microsoft.com/downloads/details.aspx?familyid=ea7c5762-586f-4e38-ad63-43eb05e79f4d
The Microsoft announce indicates workarounds.
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