[NT] Internet Explorer DBCS Remote Memory Corruption (MS06-013)

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Internet Explorer DBCS Remote Memory Corruption (MS06-013)


This vulnerability affects systems that use Double-Byte Character Sets.
Systems that are affected are Windows language versions that use a Double
Byte Character Set language. Examples of languages that use DBCS are
Chinese, Japanese, and Korean languages. Customers using other language
versions of Windows might also be affected if "Language for non-Unicode
programs" has been set to a Double Byte Character Set language.

This vulnerability could allow an attacker to execute arbitrary code on
the victim's system when the victim visits a web page or views an HTML
email message. This attack may be utilized wherever IE parses HTML, such
as webpages, email, newsgroups, and within applications utilizing
web-browsing functionality.


Products affected:
* Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service
Pack 4 and Microsoft Windows XP Service Pack 1
* Internet Explorer 6 for Microsoft Windows XP Service Pack 2
* Internet Explorer 6 for Microsoft Windows Server 2003
* Internet Explorer 6 Service Pack 1 on Microsoft Windows 98, Microsoft
Windows 98 SE, and Microsoft Windows Millennium Edition

URLMON.DLL does not properly validate IDN containing double-byte character
sets (DBCS), which may lead to remote code execution. Exploiting this
vulnerability seems to need a lot of more work but we believe that
exploitation is possible.

Microsoft has released an update for Internet Explorer which is set to
address this issue. This can be downloaded from:

CVE Information:

Vendor Response:
* 2005.12.29 - Vendor notified via secure@xxxxxxxxxxxxx
* 2005.12.29 - Vendor responded
* 2006.04.11 - Vendor released MS06-0xx patch
* 2006.04.11 - Advisory released

1. <http://www.microsoft.com/technet/security/bulletin/MS06-013.mspx>
2. <http://www.nsfocus.com/english/homepage/research/0008.htm>
3. <http://xforce.iss.net/xforce/xfdb/5729>
4. <http://www.securityfocus.com/bid/2100/discuss>
5. <http://www.inter-locale.com/whitepaper/IUC27-a303.html>
6. <http://blogs.msdn.com/michkap/archive/2005/10/28/486034.aspx>
7. [Mozilla Firefox IDN "Host:" Buffer Overflow]
8. [Mozilla Firefox 1.5 Beta 1 IDN Buffer Overflow]


The original article can be found at:


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