Internet explorer pwned Avant Browser

Monday, August 03, 2009
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Internet explorer pwned Avant Browser via
history Persistent XSS vulnerabilities
vendor url: http://www.avantbrowser.com/
Advisore: http://lostmon.blogspot.com/2009/08/
internet-explorer-pwned-avant-browser.html
vendor notify: NO exploit available: yes
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description
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Avant Browser´s user-friendly interface brings a new level
of clarity and efficiency to your browsing experience,and
frequent upgrades have steadily improved its reliability.
Avant Browser is freeware That's right. 100% Free!.

A recently vulnerability in Avant browser discovered by me
Can be exploit via history on ie8

Related Vuln =>

http://lostmon.blogspot.com/2009/07/
avant-browser-browserhome-persistent.html

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version tested
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Internet Explorer 8 (in xp home)

Avant Browser 11.7 build 35

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solution:
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Update to version 11.7 build 36
it is reported and tested that isn´t
vulnerable.

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timeline:
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discovered: 23-07-2009
disclosure: 03-08-2009

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testing
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http://lostmon.blogspot.com/2009/07/
avant-browser-browserhome-persistent.html

See this related vulnerability in avant browser.Now go
to exploit it across explorer , we know that the column
history is afected by a script insercion in browser:home
dinamicaly content.

If a user open explorer and try to navigate to a malicious
site like :
http://usuarios.lycos.es/reyfuss/id.php?id="><h1>Test html injection</h1>

For example if we Browse this url with avant browser =>
http://usuarios.lycos.es/reyfuss/id.php?id="><iframe src='http://www.google.com'></iframe>

The iframe does not executed correctly in history, but ,
close avant, browse the url with IE8 and them , open
avant browser ...the iframe now is executed correctly :D

Those url are saved in the explorer history, here is the
vulnerability, because Avant browser use IE8 web history
to show his own history in the browser:home history column,
them open avant browser and the html is executed in the history
colum and in most visited sites.

I don´t know if with the anty-xss filter in IE8 can protect
from a script attack but at this moment we can think that this
issue can have a html injection condition and a attacker can insert
a iframe...And this is other vector to attack Avant browser.

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thnx to estrella to be my ligth
thnx to Brink he is investigate with me.
thnx to all who day after day support me !!!
atentamente:
--
Lostmon (lostmon@gmail.com)
Web-Blog: http://lostmon.blogspot.com/
Google group: http://groups.google.com/group/lostmon (new)
--
La curiosidad es lo que hace mover la mente...

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