“Blended Threat” Concept in web applications

Bogdan Sergiu Dragos

a.k.a Domnul.Do

Student at Drăgan European University in Lugoj

Legal Disclame

This is only a proof of concept ,

for demostrating only .

“Blended Threat Concept”

• It has no clear definition because it’s more a concept that an attack .

• But we have the following definition from different sites:

Blended Threat Concept

• Definition from Wikipedia:

“A blended threat is a software vulnerability which in turn involves

a combination of attacks against different vulnerabilities. For example, many worm, a trojan horse and a computer virus exploit multiple techniques to attack and propagate. It is a kind of computer threat.”

Link: http://en.wikipedia.org/wiki/Blended_threat

Blended Threat Concept

• Definition from TrendMicro:

“ (…) A blended threat refers to a single threat that attacks via multiple vectors (e.g., a worm gains entry via email and then leverages back-door vulnerabilities for further infection and destruction). “

Link:

http://apac.trendmicro.com/apac/threats/enterprise/threats-summary/blended-threats/

Blended Threat Concept

• My own definition:

“A Blended Threat: is a non-limited vector that need two or more different attack,that are mutually dependent, for manipulation of the usual application logic.“

History of Blended Threat’s

• The person who introduce this kind of method was: Billy (BK) Rios

• In his presentation: “Will it Blend”

• With this P.o.C : Blended Threat from Combined Attack Using Apple’s Safari on the Windows Platform

The P.o.C

My Proof Concept is:

• In a Yahoo! Service , called YQL• Based on CSRF and one user interaction

In this presentation I will show a method to validate YQL commands, without the console , more exactly :

! To change the status in the Yahoo! Profile

YQL = Yahoo Query Language

What is YQL

YQL is:

• A SQL-like language

• A clowd service

• W can create API’s or using other API’s and manipulating the rezults in the “cloud”

• We can make authentificated YQL commands in Yahoo!Inbox or Yahoo!Profile

YQL- Open Data Tables

• It’s a way to connect to the remote web API (EndPoint) and understanding what to do with the data that will get

• How it look like:

YQL-Open Data Table Example

YQL –Use verb

• We can use simple server side javascripts in the <execute> tab of the xml ,here some exemple:

• To make an object request we can use request:Request.accept(‘application/json’)

.header(‘Authorization’, ‘…’) .query(‘searchterm’, ‘foo’).get()

• The response.object can transmit the user the final result :

Response.object = data

YQL – JS API

• Some key feature , what can do:

- use external JS files

- convert between XML JSON

- can make other YQL in the same YQL

How it look like in console

Link: http://developer.yahoo.com/yql/console/#h=update%20social.profile.status%20set%20status%3D%22EasterEgg%22%20where%20guid%3Dme

How it look like in request

• First the console read the crumb (Yahoo! Token )

• Second the console send the YQL command with the crumb to the “cloud”

First Step: Read the crumb

Note: The crumb is generated no matter if the user is logged in

Second step: Sending the data

The P.o.C

• I have the “location” of the crumb

• I know where to send the data,but how to convise the user to give us the crumb?!

The P.o.C

• I have the “location” of the crumb

• I know where to send the data,but how to convise the user to give us the crumb?!

• Is simple …

Meanwhile …

• Why do dogs (and other animals) eat poop?

“Herbivores such as rabbits eat their own poop because their diet of plants is hard to digest efficiently, and they have to make

two passes at it to get everything out of the meal.“

The P.o.C

This is another version of the attack named “Fake Captcha” by Kotowicz

The sourse of the P.o.C

How to gather the status

We can confirm by using the YQL command:

Link :

http://developer.yahoo.com/yql/console/#h=select%20message%20from%20social.profile.status%20where%20guid%3Dme

My recommendation is:

Is enough to add the response header:

”X-FRAME-OPTIONS”

Credits

• Billy (BK) Rios• Kotowicz

• Dragan European University , Lugoj , Timis

• Dan Kaminsky , in 2008 he “own-ed” the internet. His work must not be forgoten!

Want to ask something?