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                     Secunia Research 23/02/2007                      

   - Internet Explorer 7 "onunload" Event Spoofing 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 

The vulnerability is confirmed in Microsoft Internet Explorer 7.

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2) Severity 

Rating: Less critical
Impact: Spoofing
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
7, which can be exploited by a malicious website to spoof the address
bar.

The vulnerability is caused due to an error in Internet Explorer 7's
handling of "onunload" events, enabling a malicious website to abort
the loading of a new website. This can be exploited to spoof the
address bar if e.g. the user enters a new website manually in the
address bar, which is commonly exercised as best practice.

The vulnerability is confirmed on a fully patched Windows XP SP2
system running Internet Explorer 7. Other versions may also be
affected. 

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5) Solution 

Close all browser windows after visiting untrusted websites.

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6) Time Table 

05/01/2007 - Vendor notified and responded.
16/02/2007 - Further communication with vendor.
23/02/2007 - Public disclosure due to dislosure by third party.

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7) Credits 

Discovered by Jakob Balle, Secunia Research.

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8) References

No references available.

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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/2007-1/

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

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