FortiGuard Advisory: Microsoft Office Web Components Remote Memory Corruption Vulnerability

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Microsoft Office Web Components Remote Memory Corruption Vulnerability
2009.July.13

Fortinet's FortiGuard Global Security Research Team Discovers Memory Corruption 
Vulnerability in Microsoft Office Web Components.

Summary:
========
A memory corruption vulnerability exists in the ActiveX Controls of Microsoft 
Office Web Components which allows a remote attacker to compromise a system 
through a malicious site.

Impact:
=======
Remote Code Execution.

Risk:
=====
Critical

Affected Software:
==================
For a list of operating system and product versions affected, please see the 
Microsoft Security Advisory reference below.

Additional Information:
=======================
A remote attacker could craft a malicious HTML document which exploits the 
Internet Explorer. The vulnerability lies in the default ActiveX Control 
installed by the Microsoft Office. A crafted object may be created and passed 
to a method of this control that will cause memory corruption in the Internet 
Explorer. After the corruption has occured, a few specific actions will cause 
Internet Explorer to cause remote code execution through a call instruction.

Solutions:
==========
Use the workaround solution provided by Microsoft (973472).
The FortiGuard Global Security Research Team released a signature 
"MS.Office.Web.Components.Memory.Corruption", which covers this specific 
vulnerability.

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) 
service should be protected against this remote code execution vulnerability. 
Fortinet's IPS service is one component of FortiGuard Subscription Services, 
which also offer comprehensive solutions such as antivirus, Web content 
filtering and antispam capabilities. These services enable protection against 
threats on both application and network layers. FortiGuard Services are 
continuously updated by the FortiGuard Global Security Research Team, which 
enables Fortinet to deliver a combination of multi-layered security 
intelligence and true zero-day protection from new and emerging threats. These 
updates are delivered to all FortiGate, FortiMail and FortiClient products. 
Fortinet strictly follows responsible disclosure guidelines to ensure optimum 
protection during a threat's lifecycle.

References:
===========
FortiGuard Advisory: http://www.fortiguardcenter.com/advisory/FGA-2009-27.html
Microsoft Security Advisory: 
http://www.microsoft.com/technet/security/advisory/973472.mspx
CVE ID: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1136

Acknowledgement:
================
Haifei Li of Fortinet's FortiGuard Global Security Research Team


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