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Hacking Gmail Account With GX Cookie
IntroductionHacking web application was always curious for the script kiddies. And hacking free web email account is every geek first attempt. The method which I will describe in this post is not new; the same method can be applied to yahoo and other free web email services too.
The method we will be using is cookie stealing and replaying the same back to the Gmail server. There are many ways you can steal cookie, one of them is XSS (Cross site scripting) discussed by other is earlier post. But we won’t be using any XSS here, in our part of attack we will use some local tool to steal cookie and use that cookie to get an access to Gmail account.
Tool used for this attack:
Attack in detail:
We assume you are connected to LAN/Wireless network. Our main goal is to capture Gmail GX cookie from the network. We can only capture cookie when someone is actually using his gmail. I’ve noticed normally in lunch time in office, or during shift start people normally check their emails. If you are in cyber café or in Mall then there are more chances of catching people using Gmail.
We will go step by step,
If you are using Wireless network then you can skip this Step A.
A] Using Cain to do ARP poisoning and routing:
Switch allows unicast traffic mainly to pass through its ports. When X and Y are communicating eachother in switch network then Z will not come to know what X & Y are communicating, so inorder to sniff that communication you would have to poison ARP table of switch for X & Y. In Wireless you don’t have to do poisoning because Wireless Access points act like HUB which forwards any communication to all its ports (recipients).
How to check your physical IP ?
> Click on start > Run type cmd and press enter, in the command prompt type
Ipconfig and enter. This should show your IP address assign to your PC.
It will have following outputs:
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : xyz.com
IP Address. . . . . . . . . . . . : 192.168.1.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
Main thing to know here is your IP address and your Default Gateway.
Make a note of your IP Address & default gateway. From Cain you will see list of IP addresses, here you have to choose any free IP address which is not used anywhere. We assume IP 192.168.1.10 is not used anywhere in the network.
The purpose is to do ARP poisoning between victim and the default gateway and route the victim traffic via your machine. From the left side click on Victim IP address, we assume victim is using 192.168.1.15. The moment you click on victim IP you will see remaining list on the right hand side here you have to select default gateway IP address i.e. 192.168.1.1 then click on OK.
B] Using Network Miner to capture cookie in plain text
We are using Network miner to capture cookie, but Network miner can be used for manythings from capturing text , image, HTTP parameters, files. Network Miner is normally used in Passive reconnaissance to collect IP, domain and OS finger print of the connected device to your machine. If you don’t have Network miner you can use any other sniffer available like Wireshark, Iris network scanner, NetWitness etc.
We are using This tool because of its ease to use.
Now we have captured GX cookie its time now to use this cookie and replay the attack and log in to victim email id, for this we will use firefox and cookie editor add-ons.
C] Using Firefox & cookie Editor to replay attack.
How to be saved from this kind of attack?
Google has provided a way out for this attack where you can use secure cookie instead of unsecure cookie. You can enable secure cookie option to always use https from Gmail settings.
Settings > Browser connection > Always use https
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