Opera 'data:' URL Display Bug Lets Remote Users Spoof the Address Bar
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SecurityTracker Alert ID: 1018397
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SecurityTracker URL: http://securitytracker.com/id?1018397
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CVE Reference: CVE-2007-3819
(Links to External Site)
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Updated: Jul 17 2007
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Original Entry Date: Jul 17 2007
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Impact: Modification of user information
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Version(s): 9.21, possibly other versions
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Description: A vulnerability was reported in Opera. A remote user can spoof the URL address bar.
The browser does not properly display the contents of the URL bar when rendering 'data:' URLs. A remote user can create specially
crafted HTML that, when loaded by the target user, will redirect the browser to a web page that will display an arbitrary URL in
the address bar.
Robert Swiecki reported this vulnerability.
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Impact: A remote user can spoof the URL address bar contents.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.opera.com/ (Links to External Site)
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Cause: State error
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Underlying OS: Linux (Any), Windows (Any)
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Reported By: Robert Swiecki <jagger@swiecki.net>
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Message History:
None.
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Source Message Contents
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Date: Sat, 14 Jul 2007 01:50:49 +0200
From: Robert Swiecki <jagger@swiecki.net>
Subject: Opera/Konqueror: data: URL scheme address bar spoofing
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With a specially crafted web page, an attacker can redirect
a www browser to the page, which URL (in the url bar) resembles
an arbitrary domain choosen by the attacker.
It's possible due to the fact, that some web browsers incorrectly
display contents of the url bar while rendering pages based on the
'data:' URL scheme (RFC 2397). Only the ending of the URL is
displayed. Padding the URL with whitespaces allows an attacker to
insert an arbitrary content into the browser url bar.
http://alt.swiecki.net/oper1.html
Tested with:
* Opera 9.21 on Win 2003SE and Win XPSP2
* Opera 9.21 on Linux
* Konqueror 3.5.7 on Linux
Pictures taken on my systems (using 1024x768 dekstop resolution)
http://alt.swiecki.net/operalin.png
http://alt.swiecki.net/operawin.png
http://alt.swiecki.net/konq.png
Successfull attack depends on the proper construction of the
'data:' URL. An algorithm could utilize JS
document.body.clientWidth/Height properties to calculate the
best url padding for the given browser.
PS. Sometimes Opera web browser displays the beggining of
the 'data:' URL (correct behaviour), e.g. during
browser startup with immediate redirect to the last visited page.
--
Robert Swiecki
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