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Microsoft Internet Explorer Javaprxy.DLL COM Object Instantiation Heap Overflow Vulnerability

Risk
High

Date Discovered
06-29-2005

Description
Microsoft Internet Explorer is prone to a heap-based buffer overflow vulnerability. The vulnerability is exposed when the 'javaprxy.dll' COM object is instantiated by a malicious Web page.

This issue may potentially be exploited to execute arbitrary code in the context of the client.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released July 13, 2005.

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 July 13, 2005.

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 August 9, 2005.

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 95
Microsoft Windows 98
Microsoft Windows 98SE
Microsoft Windows ME
Microsoft Windows NT Enterprise Server 4.0
Microsoft Windows NT Enterprise Server 4.0 SP1
Microsoft Windows NT Enterprise Server 4.0 SP2
Microsoft Windows NT Enterprise Server 4.0 SP3
Microsoft Windows NT Enterprise Server 4.0 SP4
Microsoft Windows NT Enterprise Server 4.0 SP5
Microsoft Windows NT Enterprise Server 4.0 SP6
Microsoft Windows NT Enterprise Server 4.0 SP6a
Microsoft Windows NT Server 4.0
Microsoft Windows NT Server 4.0 SP1
Microsoft Windows NT Server 4.0 SP2
Microsoft Windows NT Server 4.0 SP3
Microsoft Windows NT Server 4.0 SP4
Microsoft Windows NT Server 4.0 SP5
Microsoft Windows NT Server 4.0 SP6
Microsoft Windows NT Server 4.0 SP6a
Microsoft Windows NT Terminal Server 4.0
Microsoft Windows NT Terminal Server 4.0 SP1
Microsoft Windows NT Terminal Server 4.0 SP2
Microsoft Windows NT Terminal Server 4.0 SP3
Microsoft Windows NT Terminal Server 4.0 SP4
Microsoft Windows NT Terminal Server 4.0 SP5
Microsoft Windows NT Terminal Server 4.0 SP6
Microsoft Windows NT Workstation 4.0
Microsoft Windows NT Workstation 4.0 SP1
Microsoft Windows NT Workstation 4.0 SP2
Microsoft Windows NT Workstation 4.0 SP3
Microsoft Windows NT Workstation 4.0 SP4
Microsoft Windows NT Workstation 4.0 SP5
Microsoft Windows NT Workstation 4.0 SP6
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 5.0.1 SP4
Microsoft Internet Explorer 5.0.1 SP3
Microsoft Internet Explorer 5.0.1 SP2
Microsoft Internet Explorer 5.0.1 SP1
Microsoft Internet Explorer 5.0.1
Microsoft Internet Explorer 5.5 SP2
Microsoft Internet Explorer 5.5 SP1
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 6.0 SP2
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.
Perform non-administrative activities as an unprivileged user with minimal access rights. This may limit the impact of Web client vulnerabilities.

Do not follow links provided by unknown or untrusted sources.
Users should be wary of visiting Web sites of questionable integrity, especially if enticed to do so in unsolicited email.

The vendor has released an advisory (Microsoft Security Advisory (903144)); this advisory contains workarounds that may be applied to prevent exploitation of this issue. Customers are highly advised to peruse the referenced advisory for further information.

Microsoft has released security bulletin MS05-037, along with fixes to address this issue. Please see the referenced advisory for further information.


Microsoft Internet Explorer 5.0.1 SP4:

Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=25982E02-EC6D-44CE-82DE-12DDEF1ADDD6

Microsoft Internet Explorer 5.0.1 SP3:
Microsoft Internet Explorer 5.0.1 SP2:
Microsoft Internet Explorer 5.0.1 SP1:
Microsoft Internet Explorer 5.0.1:
Microsoft Internet Explorer 5.5 SP2:
Microsoft Internet Explorer 5.5 SP1:
Microsoft Internet Explorer 5.5:
Microsoft Internet Explorer 6.0 SP2:
Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=C1381768-6C6D-4568-97B1-600DB8798EBF
Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=80EFD9A8-7EE9-4B0B-8517-559C49614AB7

Microsoft Internet Explorer 6.0 SP1:
Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=2A506C16-01EF-4060-BCF8-6993C55840A9

Microsoft Internet Explorer 6.0:
Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=F368E231-9918-4881-9F17-60312F82183F
Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=D785F9AB-DBE9-4272-A87E-64205690F98E
Microsoft Patch Security Update for JView Profiler (KB903235)
http://www.microsoft.com/downloads/details.aspx?familyid=68209225-A682-4008-A22B-881C401486F7

References
Source: Microsoft Internet Explorer "javaprxy.dll" Code Execution Exploit
URL: msg://bugtraq/20050702174903.13650.qmail@securityfocus.com

Source: SEC-CONSULT SA-20050629-0
URL: msg://bugtraq/42C252CA.1030101@sec-consult.com

Source: Microsoft Security Advisory (903144)
URL: http://www.microsoft.com/technet/security/advisory/903144.mspx

Source: Microsoft Security Bulletin MS05-037
URL: http://www.microsoft.com/technet/security/bulletin/MS05-037.mspx

Source: Technet Security
URL: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/itsolutions/security/default.asp

Source: Vulnerability Note VU#939605
URL: http://www.kb.cert.org/vuls/id/939605

Credits
Discovery is credited to sk0L and Martin Eiszner of SEC-CONSULT.


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