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Home arrow SecurityAlert Database

Arrow  Topic :

Opera/Konqueror: data: URL scheme address bar spoofing


Arrow  SecurityAlert : 2891
Arrow  CVE : CVE-2007-3819
Arrow  SecurityRisk : Low  Security Risk Low  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : Yes
Arrow  Exploit Given : Yes
Arrow  Credit : Robert Swiecki
Arrow  Published : 20.07.2007

Arrow  Affected Software : Opera/Konqueror



Arrow  Advisory Text :  

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



Arrow  Feedback :

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