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Microsoft Internet Explorer Malformed IFRAME Remote Buffer Overflow Vulnerability

Risk
High

Date Discovered
10-24-2004

Description
Microsoft Internet Explorer is reported prone to a remote buffer overflow vulnerability. This issue presents itself due to insufficient boundary checks performed by the application and results in arbitrary code execution or a denial of service.

This issue is reported to affect Microsoft Internet Explorer 6 running on a Windows 2000 SP4 platform.

Symantec AntiVirus Products
A heuristic detection has been released to detect possible exploits of this vulnerability. Symantec Antivirus products will detect files which contain code to exploit this vulnerability as Bloodhound.Exploit.18.

Symantec Network Security 7100
As of November 30, 2004, users of Symantec Network Security 7100 can update to Security Update 5 to detect attempts to exploit this vulnerability. Click here for more information. This update is available via LiveUpdate.

Symantec Enterprise Security Manager
Symantec Enterprise Security Manager™ posted an update to the OS Patch Policy that detects and reports systems that are not patched against this vulnerability. Click here for the advisory released December 1, 2004.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released December 2, 2004.

Platforms Affected
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Datacenter Server SP1
Microsoft Windows 2000 Datacenter Server SP2
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Professional SP1
Microsoft Windows 2000 Professional SP2
Microsoft Windows 2000 Server
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Terminal Services
Microsoft Windows 2000 Terminal Services SP1
Microsoft Windows 2000 Terminal Services SP2
Microsoft Windows 98
Microsoft Windows 98SE
Microsoft Windows ME
Microsoft Windows NT Enterprise Server 4.0 SP6a
Microsoft Windows NT Server 4.0 SP6a
Microsoft Windows NT Workstation 4.0 SP6a
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Datacenter Edition 64-bit
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Enterprise Edition 64-bit
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP Home
Microsoft Windows XP Professional

Components Affected
Microsoft Internet Explorer 6.0 SP1
Microsoft Internet Explorer 6.0

Recommendations
Run all client software as a non-privileged user with minimal access rights.
Running the client browser as a user with the minimal amount of privileges can reduce the impact of latent vulnerabilities.

Do not accept or execute files from untrusted or unknown sources.
Users should refrain from opening or executing files originating from untrusted or unknown sources.

Do not follow links provided by unknown or untrusted sources.
An attacker may supply a link to a malicious Web site that is designed to trigger this issue. Users should refrain from following links that originate from untrusted sources.

Microsoft Internet Explorer 6 Service Pack 2 is not prone to this vulnerability. If applicable, customers are advised to apply this service pack in order to mitigate the risk of exposure.

Microsoft has released a security bulletin that provides fixes for this issue on supported versions of the operating system.


Microsoft Internet Explorer 6.0 SP1:

Microsoft Patch Cumulative Security Update for Internet Explorer 6 Service Pack 1 for Windows XP & 2000 (KB889293)
http://download.microsoft.com/download/b/a/c/bac5bccc-f2c3-40a3-b010-b1c38cb2a963/IE6.0sp1-KB889293-Windows-2000-XP-x86-ENU.exe
Microsoft Patch Cumulative Security Update for Internet Explorer 6 SP1 for Windows 98, NT and ME (KB889293)
http://download.microsoft.com/download/5/2/6/526fbdb4-a46e-4b8a-bcf3-af451acbf033/IE6.0sp1-KB889293-Windows-NT4sp6a-98-ME-x86-ENU.exe
Microsoft Patch Cumulative Security Update for Internet Explorer 6 SP1 64-bit Edition (KB889293)
http://download.microsoft.com/download/9/b/8/9b8643eb-19f7-4049-96f8-e72392564350/IE6.0sp1-KB889293-WindowsXP-ia64-ENU.exe

Microsoft Internet Explorer 6.0:

References
Source: Attacks and Exploits Report # 114
URL: http://www.finjan.com/SecurityLab/AttackandExploitReports/alert_show.asp?attack_release_id=114

Source: Microsoft Security Bulletin MS04-040
URL: http://www.microsoft.com/technet/security/bulletin/ms04-040.mspx

Credits
This issue was reported by ned and Berend-Jan Wever.


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