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Category:   Application (Web Browser)  >   Opera Vendors:   Opera Software
Opera 'data:' URL Display Bug Lets Remote Users Spoof the Address Bar
SecurityTracker Alert ID:  1018397
SecurityTracker URL:
CVE Reference:   CVE-2007-3819   (Links to External Site)
Updated:  Jul 17 2007
Original Entry Date:  Jul 17 2007
Impact:   Modification of user information

Version(s): 9.21, possibly other versions
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.

Impact:   A remote user can spoof the URL address bar contents.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  Opera/Konqueror: data: URL scheme address bar spoofing

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.

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)

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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