AusCERT - AL-2009.0031 -- [Win] -- Internet Explorer: Execute Arbitrary Code

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AL-2009.0031 -- [Win] -- Internet Explorer: Execute Arbitrary Code
Date: 15 April 2009

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

                       AL-2009.0031 -- AUSCERT ALERT
                                   [Win]
                 Internet Explorer: Execute Arbitrary Code
                               15 April 2009

===========================================================================

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

Product:              Internet Explorer 5.01 Service Pack 4 when installed 
                        on Microsoft Windows 2000 Service Pack 4
                      Internet Explorer 6 Service Pack 1 when installed on 
                        Microsoft Windows 2000 Service Pack 4
                      Internet Explorer 6 for Windows XP Service Pack 2 
                      Internet Explorer 6 for Windows XP Service Pack 3
                      Internet Explorer 6 for Windows XP Professional x64 
                        Edition
                      Internet Explorer 6 for Windows XP Professional x64 
                        Edition Service Pack 2
                      Internet Explorer 6 for Windows Server 2003 Service 
                        Pack 1
                      Internet Explorer 6 for Windows Server 2003 Service 
                        Pack 2
                      Internet Explorer 6 for Windows Server 2003 x64 
                        Edition
                      Internet Explorer 6 for Windows Server 2003 x64 
                        Edition Service Pack 2
                      Internet Explorer 6 for Windows Server 2003 with SP1 
                        for Itanium-based Systems
                      Internet Explorer 6 for Windows Server 2003 with SP2 
                        for Itanium-based Systems
                      Internet Explorer 7 for Windows XP Service Pack 2
                      Internet Explorer 7 for Windows XP Service Pack 3
                      Internet Explorer 7 for Windows XP Professional x64 
                        Edition
                      Internet Explorer 7 for Windows XP Professional x64 
                        Edition Service Pack 2
                      Internet Explorer 7 for Windows Server 2003 Service 
                        Pack 1
                      Internet Explorer 7 for Windows Server 2003 Service 
                        Pack 2
                      Internet Explorer 7 for Windows Server 2003 x64 
                        Edition
                      Internet Explorer 7 for Windows Server 2003 x64 
                        Edition Service Pack 2
                      Internet Explorer 7 for Windows Server 2003 with SP1 
                        for Itanium-based Systems
                      Internet Explorer 7 for Windows Server 2003 with SP2 
                        for Itanium-based Systems
                      Internet Explorer 7 in Windows Vista and Windows 
                        Vista Service Pack 1
                      Internet Explorer 7 in Windows Vista x64 Edition
                      Internet Explorer 7 in Windows Vista x64 Edition 
                        Service Pack 1
                      Internet Explorer 7 in Windows Server 2008 for 32-bit 
                        Systems*
                      Internet Explorer 7 in Windows Server 2008 for 
                        x64-based Systems*
                      Internet Explorer 7 in Windows Server 2008 for 
                        Itanium-based Systems
Publisher:            Microsoft
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0554 CVE-2009-0553 CVE-2009-0552
                      CVE-2009-0551 CVE-2009-0550 CVE-2008-2540

Original Bulletin:    
  http://www.microsoft.com/technet/security/Bulletin/MS09-014.mspx

Comment: Exploit code has been made public for one of these vulnerabilities.

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Microsoft Security Bulletin MS09-014 - Critical

Cumulative Security Update for Internet Explorer (963027)

   Published: April 14, 2009

   Version: 1.0

General Information

Executive Summary

   This security update resolves four privately reported vulnerabilities and 
   two publicly disclosed vulnerabilities in Internet Explorer. The 
   vulnerabilities could allow remote code execution if a user views a 
   specially crafted Web page using Internet Explorer or if a user connects 
   to an attacker's server by way of the HTTP protocol. Users whose accounts 
   are configured to have fewer user rights on the system could be less 
   impacted than users who operate with administrative user rights.

   This security update is rated Critical for Internet Explorer 5.01 and 
   Internet Explorer 6 Service Pack 1, running on supported editions of 
   Microsoft Windows 2000; Internet Explorer 6 and Internet Explorer 7 
   running on supported editions of Windows XP; and Internet Explorer 7 
   running on supported editions of Windows Vista. For Internet Explorer 6 
   and Internet Explorer 7 running on supported editions of Windows Server 
   2003 and Windows Server 2008, this security update is rated Important. 
   For more information, see the subsection, Affected and Non-Affected 
   Software, in this section.

   The security update addresses these vulnerabilities by modifying the way 
   that Internet Explorer searches the system for files to load, performs 
   authentication reply validation, handles transition errors when navigating 
   between Web pages, and handles memory objects. For more information about 
   the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection 
   under the next section, Vulnerability Information.

Affected Software

   Internet Explorer 5.01 Service Pack 4 when installed on Microsoft Windows 
     2000 Service Pack 4
   Internet Explorer 6 Service Pack 1 when installed on Microsoft Windows 
     2000 Service Pack 4 
   Internet Explorer 6 for Windows XP Service Pack 2 and Windows XP Service 
     Pack 3
   Internet Explorer 6 for Windows XP Professional x64 Edition and Windows 
     XP Professional x64 Edition Service Pack 2
   Internet Explorer 6 for Windows Server 2003 Service Pack 1 and Windows 
     Server 2003 Service Pack 2
   Internet Explorer 6 for Windows Server 2003 x64 Edition and Windows Server 
     2003 x64 Edition Service Pack 2
   Internet Explorer 6 for Windows Server 2003 with SP1 for Itanium-based 
     Systems and Windows Server 2003 with SP2 for Itanium-based Systems
   Internet Explorer 7 for Windows XP Service Pack 2 and Windows XP Service 
     Pack 3
   Internet Explorer 7 for Windows XP Professional x64 Edition and Windows XP 
     Professional x64 Edition Service Pack 2
   Internet Explorer 7 for Windows Server 2003 Service Pack 1 and Windows 
     Server 2003 Service Pack 2
   Internet Explorer 7 for Windows Server 2003 x64 Edition and Windows Server 
     2003 x64 Edition Service Pack 2
   Internet Explorer 7 for Windows Server 2003 with SP1 for Itanium-based 
     Systems and Windows Server 2003 with SP2 for Itanium-based Systems
   Internet Explorer 7 in Windows Vista and Windows Vista Service Pack 1
   Internet Explorer 7 in Windows Vista x64 Edition and Windows Vista x64 
     Edition Service Pack 1
   Internet Explorer 7 in Windows Server 2008 for 32-bit Systems*
   Internet Explorer 7 in Windows Server 2008 for x64-based Systems*
   Internet Explorer 7 in Windows Server 2008 for Itanium-based Systems

   *Windows Server 2008 server core installation not affected.

Vulnerability Information

Blended Threat Remote Code Execution Vulnerability - CVE-2008-2540

A blended threat remote code execution vulnerability exists in the way that 
Internet Explorer locates and opens files on the system. An attacker could 
exploit the vulnerability by constructing a specially crafted Web page. 
When a user views the Web page, the vulnerability could allow remote code 
execution. An attacker who successfully exploited this vulnerability could 
gain the same user rights as the logged-on user. If a user is logged on 
with administrative user rights, an attacker who successfully exploited 
this vulnerability could take complete control of an affected system. An 
attacker could then install programs; view, change, or delete data; or 
create new accounts with full user rights.

WinINet Credential Reflection Vulnerability - CVE-2009-0550

A remote code execution vulnerability exists in the way that WinINet 
handles NTLM credentials when a user connects to an attacker's server by 
way of the HTTP protocol. This vulnerability allows an attacker to replay 
the user's credentials back to the attacker and to execute code in the 
context of the logged-on user. If a user is logged on with administrative 
user rights, an attacker who successfully exploited this vulnerability 
could take complete control of an affected system. An attacker could then 
install programs; view, change, or delete data; or create new accounts 
with full user rights.

Page Transition Memory Corruption Vulnerability - CVE-2009-0551

A remote code execution vulnerability exists in the way Internet Explorer 
handles transition when navigating between Web pages. As a result, system
 memory may be corrupted in such a way that an attacker could execute 
arbitrary code if a user visited a specially crafted Web site. An attacker 
who successfully exploited this vulnerability could gain the same user 
rights as the logged-on user. If a user is logged on with administrative 
user rights, an attacker who successfully exploited this vulnerability 
could take complete control of an affected system. An attacker could then 
install programs; view, change, or delete data; or create new accounts 
with full user rights. 

Uninitialized Memory Corruption Vulnerability - CVE-2009-0552

A remote code execution vulnerability exists in the way Internet Explorer 
accesses an object that has not been correctly initialized or has been 
deleted. An attacker could exploit the vulnerability by constructing a 
specially crafted Web page. When a user views the Web page, the 
vulnerability could allow remote code execution. An attacker who 
successfully exploited this vulnerability could gain the same user rights 
as the logged-on user. If a user is logged on with administrative user 
rights, an attacker who successfully exploited this vulnerability could 
take complete control of an affected system. An attacker could then 
install programs; view, change, or delete data; or create new accounts 
with full user rights.

Uninitialized Memory Corruption Vulnerability - CVE-2009-0553

A remote code execution vulnerability exists in the way Internet Explorer 
accesses an object that has not been correctly initialized or has been 
deleted. An attacker could exploit the vulnerability by constructing a 
specially crafted Web page. When a user views the Web page, the 
vulnerability could allow remote code execution. An attacker who 
successfully exploited this vulnerability could gain the same user rights 
as the logged-on user. If a user is logged on with administrative user 
rights, an attacker who successfully exploited this vulnerability could 
take complete control of an affected system. An attacker could then install 
programs; view, change, or delete data; or create new accounts with full 
user rights. 

Uninitialized Memory Corruption Vulnerability - CVE-2009-0554

A remote code execution vulnerability exists in the way Internet Explorer 
accesses an object that has not been initialized or has been deleted. An 
attacker could exploit the vulnerability by constructing a specially 
crafted Web page. When a user views the Web page, the vulnerability could 
allow remote code execution. An attacker who successfully exploited this 
vulnerability could gain the same user rights as the logged-on user.

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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                which are GMT+10:00 (AEST).
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