Re: JavaScript

From: Shill (devnull_at_example.com)
Date: 04/28/03 

Date: Mon, 28 Apr 2003 22:35:48 +0200

> <script language="javascript1.2">

We are dealing with JavaScript.

> var bottomCodes = "a string of comma-separated integers";

In fact, decimal ASCII code.

> var spObj = bottomCodes.split(",");

Convert the string to an array, splitting along the commas.

> for(var i=0; i<bottomCodes.length; i++)
> document.write(String.fromCharCode(spObj[i]));

I think the author meant to write: for(var i=0; i<spObj.length; i++)
which loops through the array, writing a single character at a time.

bottomCodes.length is the length of the string (424 bytes).
spObj.length is the number of elements in the array (120).

A buffer overflow in 4 lines of code... wow!

After the obfuscation is removed, we get:

<img src="http://dc.co.kr" border=0 width=0 height=0>
<!--img src="http://www.sonyang.com" border=0 width=0 height=0-->

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