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Microsoft Windows COM Object Instantiation Memory Corruption Vulnerability Advisory Available in Danish 

Secunia Advisory: SA16480  
Release Date: 2005-08-18
Last Update: 2005-11-21

Critical:
Highly critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

OS:Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP Embedded
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

Software:Microsoft Internet Explorer 5.01
Microsoft Internet Explorer 6.x

CVE reference:CVE-2005-2127 (Secunia mirror)

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Description:
A vulnerability has been reported in Internet Explorer, which can be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a memory corruption error when the "msdds.dll" (Microsoft DDS Library Shape Control) and other COM objects are instantiated in the Internet Explorer browser. For certain COM objects, e.g. "mdt2dd.dll" (Microsoft Design Tools PolyLine Control 2), the vulnerability is caused due to the failure of the memory allocator to zero the contents of heap memory allocated to new object instances. As a result, the object destructor may use the previous memory content as function pointers in its function calls.

Successful exploitation allows execution of arbitrary code, but requires that a user is tricked into visiting a malicious web site.

For a detailed list of affected COM objects, see the vendor advisory MS05-052.

NOTE: An exploit has been published.

Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.

Solution:
Apply patches:

Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 (requires Service Pack 4):
http://www.microsoft.com/downloads/de...=B1F0216C-0D62-4141-9DC7-3C7B06C3A30A

Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 (requires Service Pack 4):
http://www.microsoft.com/downloads/de...=8F638D4A-670D-46C7-A7A1-1D1E3DC9732F

Internet Explorer 6 Service Pack 1 on Microsoft Windows XP (requires Service Pack 1):
http://www.microsoft.com/downloads/de...=8F638D4A-670D-46C7-A7A1-1D1E3DC9732F

Internet Explorer 6 for Microsoft Windows XP (requires Service Pack 2):
http://www.microsoft.com/downloads/de...=41CCCA21-5010-49FF-A2DD-CB365F6FD3C5

Internet Explorer 6 for Microsoft Windows Server 2003 (with or without Service Pack 1):
http://www.microsoft.com/downloads/de...=4739846F-C35D-4C62-8E1A-60E01F3B3A59

Internet Explorer 6 for Microsoft Windows Server 2003 (Itanium) (with or without SP 1):
http://www.microsoft.com/downloads/de...=44F43899-E897-4495-A4F1-73A4D48E001A

Internet Explorer 6 for Microsoft Windows Server 2003 x64 Edition:
http://www.microsoft.com/downloads/de...=24846F0A-0530-42D1-AC60-216C0260ACA3

Internet Explorer 6 for Microsoft Windows XP Professional x64 Edition:
http://www.microsoft.com/downloads/de...=59575247-3E71-4595-92B9-4E45F6D324EF

Microsoft Windows XP Embedded (with SP2):
http://www.microsoft.com/downloads/de...=e7b6d199-7607-44a8-96fd-5a2386427bd9

Microsoft Windows XP Embedded (with SP1):
http://www.microsoft.com/downloads/de...=47633799-2103-4fc2-b63d-a9581a2d2f2d

Provided and/or discovered by:
Reported by anonymous person.

Additional information provided by eEye Digital Security.

Changelog:
2005-08-18: Added Microsoft Office XP as affected. Added link to ISC.
2005-08-19: Added additional information from Microsoft.
2005-08-22: Added additional information from Microsoft about vulnerable versions of the COM object.
2005-08-26: Added additional information from Microsoft about vulnerable versions of the COM object.
2005-10-11: Added information about patches. Updated description and solution. Added link to vendor advisory.
2005-10-12: Added information from eEye Digital Security. Updated "Description", "Original Advisory" and credit sections.
2005-10-17: Added link to US-CERT vulnerability note.
2005-11-21: Added patch information for Windows XP Embedded.

Original Advisory:
MS05-052 (KB896688):
http://www.microsoft.com/technet/security/Bulletin/MS05-052.mspx

Microsoft (KB906267):
http://www.microsoft.com/technet/security/advisory/906267.mspx
http://support.microsoft.com/kb/906267

eEye Digital Security:
http://www.eeye.com/html/research/advisories/AD20051011d.html

Other References:
ISC:
http://isc.sans.org/diary.php?date=2005-08-18

US-CERT VU#740372:
http://www.kb.cert.org/vuls/id/740372

US-CERT VU#898241:
http://www.kb.cert.org/vuls/id/898241



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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