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Microsoft Internet Explorer COM Object Instantiation Code Execution Vulnerability Variant

Risk
High

Date Discovered
6/13/2006 12:00:00 AM

Description
Microsoft Internet Explorer is prone to a memory-corruption vulnerability that is related to the instantiation of COM objects. This issue results from a design error. The vulnerability arises because of the way Internet Explorer tries to instantiate certain COM objects as ActiveX controls, resulting in arbitrary code execution. The affected objects are not intended to be instantiated through Internet Explorer. This BID is related to the issues described in BID 14511 (Microsoft Internet Explorer COM Object Instantiation Buffer Overflow Vulnerability), BID 15061 (Microsoft Internet Explorer COM Object Instantiation Variant Vulnerability), and BID 17453 (Microsoft Internet Explorer COM Object Instantiation Code Execution Vulnerability). However, this issue affects a different set of COM objects that were not addressed in the previous BIDs.

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 June 16, 2006.

Symantec Enterprise Security Manager Network Assessment Module
Symantec Enterprise Security Manager Network Assessment Module detects and reports this vulnerability. Click here for the advisory released June 20, 2006.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released June 21, 2006.

Technologies Affected
Microsoft Internet Explorer 5.0.1
Microsoft Internet Explorer 5.0.1 for Windows 2000
Microsoft Internet Explorer 5.0.1 for Windows 95
Microsoft Internet Explorer 5.0.1 for Windows 98
Microsoft Internet Explorer 5.0.1 for Windows NT 4.0
Microsoft Internet Explorer 5.0.1 SP1
Microsoft Internet Explorer 5.0.1 SP2
Microsoft Internet Explorer 5.0.1 SP3
Microsoft Internet Explorer 5.0.1 SP4
Microsoft Internet Explorer 6.0
Microsoft Internet Explorer 6.0 SP1

Recommendations
Run all software as a non-privileged user with minimal access rights.
Ensure that all non-administrative tasks, such as browsing the web and reading email, are performed as an unprivileged user with minimal access rights.
Do not follow links provided by unknown or untrusted sources.
Users should never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.
Set web browser security to disable the execution of script code or active content.
Disabling scripting and active content in the Internet Zone may limit exposure to this and other vulnerabilities.
Implement multiple redundant layers of security.
As an added precaution, deploy memory-protection schemes (such as non-executable stack/heap configuration and randomly mapped memory segments). This may complicate exploitation of memory-corruption vulnerabilities.

Microsoft has released a cumulative security update to address this issue.
Microsoft Internet Explorer 5.0.1 SP4:

Microsoft Patch Cumulative Update for Internet Explorer 5.01 Service Pack 4 (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=91A997DE-BAE4-4AC7-912D-79EF8ABAEF4F&displaylang=en

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Cumulative Update for Internet Explorer 6 SP1 (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=0EB17A41-FB43-413B-A5CC-41E1F3DEDE4F&displaylang=en

Microsoft Internet Explorer 6.0:
Microsoft Patch Cumulative Update for Internet Explorer for Windows XP Service Pack 2 (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=85CABE87-C4A0-4F80-BD1C-210E23FD8D81&displaylang=en

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Cumulative Update for Internet Explorer for Windows XP Service Pack 2 (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=85CABE87-C4A0-4F80-BD1C-210E23FD8D81&displaylang=en

Microsoft Internet Explorer 6.0:
Microsoft Patch Cumulative Update for Internet Explorer for Windows Server 2003 (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=CCE7C875-C9A4-4C3D-A37B-946EE5E781E7&displaylang=en

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Cumulative Update for Internet Explorer for Windows Server 2003 (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=CCE7C875-C9A4-4C3D-A37B-946EE5E781E7&displaylang=en

Microsoft Internet Explorer 6.0:
Microsoft Patch Cumulative Update for Internet Explorer for Windows Server 2003 64-bit Itanium Edition (KB916281) -
http://www.microsoft.com/downloads/details.aspx?familyid=C8E4CFB6-1350-4AAE-B681-EE2ECAB41118&displaylang=en

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Cumulative Update for Internet Explorer for Windows Server 2003 64-bit Itanium Edition (KB916281) -
http://www.microsoft.com/downloads/details.aspx?familyid=C8E4CFB6-1350-4AAE-B681-EE2ECAB41118&displaylang=en

Microsoft Internet Explorer 6.0:
Microsoft Patch Cumulative Update for Internet Explorer for Windows Server 2003 x64 Edition (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=1C7D5C6D-DDCF-485D-A1E3-60E55334FD74&displaylang=en

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Cumulative Update for Internet Explorer for Windows Server 2003 x64 Edition (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=1C7D5C6D-DDCF-485D-A1E3-60E55334FD74&displaylang=en

Microsoft Internet Explorer 6.0:
Microsoft Patch Cumulative Update for Internet Explorer for Windows XP x64 Edition (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=F91791AC-8185-4346-AA66-89F74D4B5EA7&displaylang=en

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Cumulative Update for Internet Explorer for Windows XP x64 Edition (KB916281)
http://www.microsoft.com/downloads/details.aspx?familyid=F91791AC-8185-4346-AA66-89F74D4B5EA7&displaylang=en

References
Source: Internet Explorer Home Page
URL: http://www.microsoft.com/windows/ie/default.mspx

Source: MS06-021 - Cumulative Security Update for Internet Explorer (916281)
URL: http://www.microsoft.com/technet/security/Bulletin/MS06-021.mspx

Credits
H D Moore is credited with the discovery of this vulnerability.


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