Microsoft Vector Markup Language Remote Code Execution

Notification Type: IBM Internet Security Systems Protection Alert
Notification Date: August 14, 2007
Notification Version: 1.1
   
Name: Microsoft Vector Markup Language Remote Code Execution
Public disclosure/
In the wild date:		 Aug. 14, 2007 (vuln disclosure)
CVE: CVE-2007-1749
Description:

A vulnerability in Microsoft's implementation of Vector Markup Language could allow remote code execution.

 

ISS Coverage
Product Content Version
Network Sensor 7.0
Proventia A
Proventia IPS (G/GX)
Server Sensor 7.0
Proventia Multifunction Appliance
Proventia Server (Linux)		 27.070
Proventia Server (Windows)
Proventia Desktop		 x.x.x.2080
BlackICE PC Protection 3.6 CQN
Propagation Techniques ISS Protection Available
remote exploit VML_Detected (when enabled, blocks all VML) Aug 16, 2007

Detailed Description
Business Impact: This vulnerability allows an attacker to obtain complete control over the target system and could be exploited through a malicious web page or email.  IBM X-Force considers this to be one of the most severe vulnerabilities in this month’s Microsoft patch bundle because it could be used in an email worm. IBM X-Force advises users to disable VML in their browsers.  VML is rarely used on the web and several exploits have targeted it over the past 12 months. CVE-2006-5745 is one such vulnerability, which IBM X-Force researchers discovered being exploited in the wild.
CVSS: Base Score: 8
  Access Vector: Remote
Access Complexity: High
Authentication: Not Required
Confidentiality Impact: Complete
Integrity Impact: Complete
Availability Impact: Complete
Impact Bias: Normal 
Adjusted Temporal Score: 5.9
  Exploitability: Unproven
Remediation Level: Official Fix
Report Confidence: Confirmed 
Affected Products: For a full list of affected versions, see XFDB references below.
Technical Description: The Microsoft Windows Vector Markup Language (VML) implementation is vulnerable to a buffer overflow in the vector graphics link library (vgx.dll). By persuading a victim to visit a malicious Web page or open a specially-crafted HTML email using Microsoft Internet Explorer, a remote attacker could overflow a buffer and execute arbitrary code on the system with the privileges of the victim.
Remediation:

Patches are available for this issue. See References for details.

References
XFDB http://xforce.iss.net/xforce/xfdb/35761
Microsoft http://www.microsoft.com/technet/security/bulletin/ms07-050.mspx

Revision History
1.0 Initial publication.
1.1 Revised signature date.

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