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Category:   Application (Web Browser)  >   Microsoft Internet Explorer (IE) Vendors:   Microsoft
Microsoft Internet Explorer URLMON.DLL Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1016839
SecurityTracker URL:  http://securitytracker.com/id/1016839
CVE Reference:   CVE-2006-3873   (Links to External Site)
Date:  Sep 13 2006
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5 SP4, 6 SP1
Description:   A vulnerability was reported in Microsoft Internet Explorer (IE). A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted, compressed URL and return this URL from a web server as part of an HTTP 302 redirect message (via HTTP 1.1). This will trigger a heap overflow in URLMON.DLL and execute arbitrary code on the target system. The code will run with the privileges of the target user.

The vulnerability was introduced (or exposed) in the second MS06-042 patch for IE 5 SP4 and IE 6 SP1 [the second version of the patch was released on August 24, 2006].

IE 6 SP1 with MS06-042 v1 or v2 on Windows 2000, Windows XP SP1, or Windows Server 2003 is affected. IE 5 SP4 with MS06-042 on Windows 2000 is affected.

eEye Digital Security discovered this vulnerability.

The vendor was notified on August 24, 2006.

Impact:   A remote server can return a URL that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   On September 12, 2006, Microsoft re-issued the MS06-042 cumulative update for IE:

Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service Pack 4:

http://www.microsoft.com/downloads/details.aspx?FamilyId=44A8C303-B46C-4CCE-8442-D8A1CF1561DC&displaylang=en

Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4 or on Microsoft Windows XP Service Pack 1:

http://www.microsoft.com/downloads/details.aspx?FamilyId=B6E09C27-CE26-494F-AD2A-6C9A8C72453F&displaylang=en

Internet Explorer 6 for Microsoft Windows XP Service Pack 2:

http://www.microsoft.com/downloads/details.aspx?FamilyId=CDB85BCA-0C17-44AA-B74E-F01B5392BB31

Internet Explorer 6 for Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1:

http://www.microsoft.com/downloads/details.aspx?FamilyId=D30209FA-9994-4F1B-B6D6-4BACC328135A&displaylang=en

Internet Explorer 6 for Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based Systems:

http://www.microsoft.com/downloads/details.aspx?FamilyId=FFE108B8-05C9-4B5E-A8A4-042F49068972

Internet Explorer 6 for Microsoft Windows Server 2003 x64 Edition:

http://www.microsoft.com/downloads/details.aspx?familyid=5C2A23AC-3F2E-4BEC-BE16-4B45B44C6346

Internet Explorer 6 for Microsoft Windows XP Professional x64 Edition:

http://www.microsoft.com/downloads/details.aspx?FamilyId=0CE7F66D-4D83-4090-A034-9BBE286D96FA

A restart is required.

The Microsoft advisory is available at:

http://www.microsoft.com/technet/security/bulletin/ms06-042.mspx

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms06-042.mspx (Links to External Site)
Cause:   Boundary error
Underlying OS:   Windows (2000), Windows (2003), Windows (XP)

Message History:   None.


 Source Message Contents

Date:  Wed, 13 Sep 2006 00:34:43 -0400
Subject:  Internet Explorer vulnerability


From Microsoft:

 - http://www.microsoft.com/technet/security/bulletin/ms06-042.mspx
 - Reason for Revision: This Security Bulletin and Internet Explorer
    6 Service Pack 1, Internet Explorer 5.01 Service Pack 4, and
    Internet Explorer 6 for Microsoft Windows Server 2003
    security updates have been re-released to address a
    vulnerability documented in the Vulnerability Details section
    as Long URL Buffer Overflow - CVE-2006-3873.  Customers using
    these versions of Internet Explorer should apply the new
    update immediately.    
 - Originally posted: August 8, 2006
 - Updated: September 12, 2006
 - Bulletin Severity Rating: Critical
 - Version: 3.0
 
 


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