From: Paul Schmehl (paulsutdallas.edu)
Date: Sat Mar 10 2007 - 16:33:21 CST

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--On March 10, 2007 4:51:51 PM -0500 Valdis.Kletnieksvt.edu wrote:

> On Sat, 10 Mar 2007 15:15:54 CST, Paul Schmehl said:
>> Given the syntax of this function, wgBreakFrames can only have one of
>> two values: true or false.
>>
>> I'd be interested to see some POC that would show how you would exploit
>> this.
>
> The first thing to do is abuse the variable.

How? You'd have to find some way to inject code into the javascript
"stream". If you can inject code into the site, it won't be because that
variable exists. It will be because something else isn't properly
evaluating input.

 In addition to true and
> false, try 3, 0 , -37, "Cabbage", and maybe "true) and
> (my_evil_function()))". See if you can force it to throw a syntax error
> that creates a 404 page or something that contains *other* input you
> control, especially if it finds its way to an eval().
>
Even if this is true, all you would have then is an information disclosure
that might lead to some other compromise path. But all the code is
already available to the attacker, so he/she ought to be able to read the
code and find the exploitable condition without doing all that extra work.

Paul Schmehl (paulsutdallas.edu)
Senior Information Security Analyst
The University of Texas at Dallas
http://www.utdallas.edu/ir/security/

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