Bugtraq mailing list archives
Opera/Konqueror: data: URL scheme address bar spoofing
From: Robert Swiecki <jagger () swiecki net>
Date: Sat, 14 Jul 2007 01:50:49 +0200
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
Current thread:
- Opera/Konqueror: data: URL scheme address bar spoofing Robert Swiecki (Jul 14)
- <Possible follow-ups>
- Re: Opera/Konqueror: data: URL scheme address bar spoofing Harri Porten (Jul 14)
- Re: Opera/Konqueror: data: URL scheme address bar spoofing lockoom (Jul 16)