Cracking Steganography Application in less than ONE minute
Good day
Direct Link to Advisory
http://homepage.mac.com/adonismac/Advisory/steg/steganography.html
Affected Product
================
Steganography 1.7.1 and 1.8 (latest). http://www.securekit.com/hidefiles.htm
Bug Type and Date
=================
Type: Bad Design
Date: 01/06/2007
Bug Results
===========
Cracking encrypted steganorgaphy files without any bruteforce.
Bug Description
===============
You can crack steganography encrypted files very easy in fact in less than one
minute. The problem is similar to the bug I found in PGP last year.
First you have to identify the steged files. Steganography application leave a
footprint after you stego a file.
If you look at the end of your steged file you will notice it will end with 30
00 02 FF FF. So a simple HEX search will reveal all steged files.
So now we have identified the steged, the next step is to access the HIDDEN
message without cracking the password. Here is how
Proof-of-Concept
================
Step 01
========
1- We use a file cover (carrier file) called "picture_original.jpg"
2- We will hide inside it a message "Hello Adonis"
3- We will use a password "aaaaaa"
4- We generated the steged file we will call it "picture_with_hidden_msg.jpg"
Step02
======
To access the hidden message WITHOUT the original password "aaaaaa" we will do
the followings:
1- We will use any other picture file say "mypicture.jpg"
2- We will hide inside it a message "WHATEVER"
3- We will use a password "a"
4- We generate the steged file we will call it "mypicture_steg.jpg"
5- We will open Both pictures in a hex editor
6- We will replace the last 20 bites of " picture_with_hidden_msg.jpg" with the
one from mypicture_steg.jpg
7- Save picture "picture_with_hidden_msg.jpg"
8- Open it using a as password. YES we overwrite the password with something we
know.
Simple hein !!!
Peace