[Full-disclosure] [WEB SECURITY] Useful technique when performing XSS

[Amit Klein]

pdp (architect) wrote:
> Amit,
>
> :) This is not about who did it first. 

Agreed. But it would be nice to receive the credit ;-)
> BTW, your example is broken.
> location.search does not include the fragment identifier.
>

Guilty as charged. I remember working directly with document.location 
(which includes the hostname and path) when I investigated the issue, 
then when I wrote my text I decided that a more elegant way would be 
with the ".search" property, but I failed to verify that it actually 
works. Thanks for pointing this out, and here's the formal errata:

    In 
http://www.webappsec.org/lists/websecurity/archive/2005-10/msg00030.html, 
the example should be:

    http://target.site/vulnscript.cgi?injectme= 
<http://target.site/vulnscript.cgi?injectme=><script>eval(document.location.substr(...[fill 
in the offset here]...))</script>#...JS payload here...

    Thanks to "pdp (architect)" for pointing this out.  

Regardns,
-Amit


> Cheers
>
> On 2/7/07, Amit Klein <aksecurity at gmail.com> wrote:
>> pdp (architect) wrote:
>> > http://www.gnucitizen.org/blog/playing-in-large
>> >
>> > Basically this article is about how to squeeze more data into size
>> > restricted, unsanitized field. This technique can also be used to hide
>> > attackers activities.
>> >
>> It seems that you've stumbled upon something I already disclosed:
>> http://www.webappsec.org/lists/websecurity/archive/2005-10/msg00030.html
>>
>> Sorry...
>> -Amit
>>
>>
>
>