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Secunia Research: Internet Explorer HTML Objects Memory Corruption Vulnerability

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                     Secunia Research 09/05/2007                      

   - Internet Explorer HTML Objects Memory Corruption Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* Microsoft Internet Explorer 7

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2) Severity 

Rating: Moderately Critical
Impact: System Access
Where:  Remote

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3) Vendor's Description of Software 

Internet Explorer 7 provides improved navigation through tabbed
browsing, web search right from the toolbar, advanced printing, easy
discovery, reading and subscription to RSS feeds, and much more.

http://www.microsoft.com/windows/products/winfamily/ie/default.mspx

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Internet Explorer, 
which can be exploited by malicious people to compromise a vulnerable
system.

The vulnerability is caused due to an error in the handling of HTML
objects as a CMarkup object is used in certain cases after it has been
freed. This can be exploited to corrupt memory via a specially crafted
web page.

Successful exploitation allows execution of arbitrary code.

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5) Solution 

Apply patches (see the Microsoft security bulletin for details).

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6) Time Table 

18/01/2007 - Vendor notified.
19/01/2007 - Vendor response.
09/05/2007 - Public disclosure.

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7) Credits 

Discovered by JJ Reyes, Secunia Research.

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8) References

MS07-027 (KB931768):
http://www.microsoft.com/technet/security/Bulletin/MS07-027.mspx

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2007-0947 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private 
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the 
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/ 

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-36/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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