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Vulnerability of Microsoft Office: code execution via Visual Basic for Applications

Synthesis of the vulnerability 

An attacker can invite the victim to open an Office document containing VB code and an ActiveX, in order to execute code on his computer.
Vulnerable products: Office, Access, Excel, Microsoft FrontPage, OneNote, Outlook, PowerPoint, Project, Publisher, Visio, Word.
Severity of this weakness: 3/4.
Creation date: 11/05/2010.
Références of this bulletin: 978213, BID-39931, CERTA-2010-AVI-206, CVE-2010-0815, MS10-031, VIGILANCE-VUL-9636.

Description of the vulnerability 

An Office document can contain VB code, which is interpreted by Visual Basic for Applications, managed by the VBE6.DLL library.

Visual Basic for Applications does not correctly manage the loading order of ActiveX. An Office document can thus contain a malicious ActiveX, and a VB code loading this ActiveX, and corrupting one byte in the memory.

An attacker can therefore invite the victim to open an Office document containing VB code and an ActiveX, in order to execute code on his computer.
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This vulnerability alert impacts software or systems such as Office, Access, Excel, Microsoft FrontPage, OneNote, Outlook, PowerPoint, Project, Publisher, Visio, Word.

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

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

An attacker with a expert ability can exploit this computer vulnerability.

Solutions for this threat 

Microsoft Office: patch.
A patch is available:
Office XP SP 3 :
  http://www.microsoft.com/downloads/details.aspx?familyid=72c23b0f-4e24-4334-bc8a-334adc8bc42b
Office 2003 SP 3 :
  http://www.microsoft.com/downloads/details.aspx?familyid=f8eac9bc-8389-4ac8-8b29-9a8180d9fd34
Office 2007 SP1, SP2 :
  http://www.microsoft.com/downloads/details.aspx?familyid=160ad53e-6475-4550-90c2-444e4abea730
Microsoft Visual Basic for Applications :
  http://www.microsoft.com/downloads/details.aspx?familyid=436a8a66-352e-44d1-a610-c825083ad24a
The Microsoft announce indicates workarounds.
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