Microsoft Internet Explorer Msauth.dll Code Execution

Notification Type: IBM Internet Security Systems Protection Alert
Notification Date: May 8, 2007
Notification Version: 1.0
   
Name: Microsoft Internet Explorer Msauth.dll Code Execution
Public disclosure/
In the wild date:
May 8, 2007
Aliases: Microsoft Security Advisory (931768)
CVE: CVE-2007-2221
Description: Microsoft Internet Explorer could allow a remote attacker to execute arbitrary code on the system, caused by a vulnerability in the mdsauth.dll control in Windows Media Server.

 

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)
27.010
Proventia Server (Windows)
Proventia Desktop
x.x.x.2020
RealSecure Desktop 7.0 EQH
BlackICE PC Protection 3.6 CQH
Enterprise Scanner 1.21
Internet Scanner 7.2.42
Propagation Techniques ISS Protection Available
remote exploit JavaScript_Browser_Overwrite May 8, 2007
Detection Techniques ISS Detection Available
network assessment WinMs07kb931768Update May 9, 2007

Detailed Description

Business Impact:

This bulletin covers 6 remote code execution vulnerabilities in Microsoft Internet Explorer. The most critical of these is an arbitrary file overwrite vulnerability that can be easily leveraged through an ActiveX control (mdsauth.dll) that ships with Microsoft Windows Media Server. Administrators are advised to remediate this as soon as possible. The bulletin also covers a problem with an ActiveX control that ships with certain East Asian language packages that should not be instantiated in Internet Explorer. A denial of service POC for that vulnerability has been in the wild since August. The other four vulnerabilities involve potentially exploitable crashes that occur when Internet Explorer encounters certain conditions. In some cases those conditions involve the combination of user interaction and html which is not necessarily malformed.

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:

Microsoft Internet Explorer: 6.0
Microsoft Internet Explorer: 6.0 SP1
Microsoft Internet Explorer: 5.01 SP4

Technical Description: Microsoft Internet Explorer could allow a remote attacker to execute arbitrary code on the system, caused by a vulnerability in the mdsauth.dll control in Windows Media Server. An attacker could exploit this vulnerability by persuading a victim to visit a specially-crafted Web page.
Remediation: Apply the patch for this vulnerability, as listed in Microsoft Security Bulletin MS07-027. See References.

References

XFDB http://xforce.iss.net/xforce/xfdb/33355
Microsoft http://www.microsoft.com/technet/security/Bulletin/MS07-027.mspx

Revision History

1.0 Initial publication.

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