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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2005.0042 -- AUSCERT ALERT
                                   [Win]
   Cumulative Security Update for Internet Explorer (905915) - MS05-054
                             14 December 2005

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        AusCERT Alert Summary
        ---------------------

Product:           Internet Explorer 6
                   Internet Explorer 5.5
                   Internet Explorer 5
Publisher:         Microsoft
Operating System:  Windows Server 2003
                   Windows XP
                   Windows 2000
                   Windows ME
                   Windows 98
Impact:            Administrator Compromise
                   Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated
CVE Names:         CAN-2005-1790 CAN-2005-2829 CAN-2005-2830
                   CAN-2005-2831

Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS05-054.mspx

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MS05-054 - Cumulative Security Update for Internet Explorer (905915)

Affected Components:
   - Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service 
     Pack 4
   - Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 
     4 or on Microsoft Windows XP Service Pack 1
   - Internet Explorer 6 for Microsoft Windows XP Service Pack 2
   - Internet Explorer 6 for Microsoft Windows Server 2003 and Microsoft 
     Windows Server 2003 Service Pack 1
   - Internet Explorer 6 for Microsoft Windows Server 2003 for Itanium-based 
     Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based 
     Systems
   - Internet Explorer 6 for Microsoft Windows Server 2003 x64 Edition
   - Internet Explorer 6 for Microsoft Windows XP Professional x64 Edition
   - Internet Explorer 5.5 Service Pack 2 on Microsoft Windows Millennium
     Edition
   - Internet Explorer 6 Service Pack 1 on Microsoft Windows 98, on Microsoft
     Windows 98 SE, or on Microsoft Windows Millennium Edition.

Vulnerability Details

File Download Dialog Box Manipulation Vulnerability - CAN-2005-2829:

   A remote code execution vulnerability exists in the way Internet Explorer 
   displays file download dialog boxes and accepts user input during 
   interaction with a Web page. This interaction could be in the form of 
   certain keystrokes that a user makes when visiting a Web page. A custom 
   dialog box may also be positioned in front of a file download dialog box to
   make this more convincing. A user may also be persuaded to double-click an 
   element of a Web page.

   An attacker could exploit the vulnerability by constructing a malicious Web
   page that could potentially allow remote code execution if a user visited 
   the malicious Web site. An attacker who successfully exploited this
   vulnerability could take complete control of an affected system. However, 
   significant user interaction is required to exploit this vulnerability.

HTTPS Proxy Vulnerability- CAN-2005-2830:

   An information disclosure vulnerability exists in the way Internet Explorer
   behaves in certain situations where an HTTPS proxy server requires clients
   to use Basic authentication. This vulnerability could allow an attacker to
   read Web addresses in clear text sent from Internet Explorer to a proxy
   server despite the connection being an HTTPS connection.

COM Object Instantiation Memory Corruption Vulnerability - CAN-2005-2831:

   A remote code execution vulnerability exists in the way Internet Explorer
   instantiates COM objects that are not intended to be instantiated in 
   Internet Explorer. An attacker could exploit the vulnerability by 
   constructing a malicious Web page that could potentially allow remote code
   execution if a user visited the malicious Web site. An attacker who 
   successfully exploited this vulnerability could take complete control of 
   an affected system.

Mismatched Document Object Model Objects Memory Corruption Vulnerability -
CAN-2005-1790:

   A remote code execution vulnerability exists in the way Internet Explorer
   handles mismatched Document Object Model objects. An attacker could exploit 
   the vulnerability by constructing a malicious Web page that could 
   potentially allow remote code execution if a user visited the malicious Web
   site. An attacker who successfully exploited this vulnerability could take 
   complete control of an affected system.

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
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        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
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Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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