How to find and use public exploit code linux kernel upgrade

How to find and use public exploit code linux kernel upgrade Learn ethical hacking, penetration testing, cyber security, best security and web penetration testing techniques from best ethical hackers in security field. Welcome back my fellow hackers! Today we’re going cover how to find and use public exploit code. Linux kernel log Often times when trying to compromise a target, we find vulnerabilities that we, the attackers, can exploit.

Linux kernel network But it would be extremely time consuming if we had to develop our own exploits every time we wanted to take advantage of these vulnerabilities. Understanding linux kernel Instead of being forced to make our own exploits, what if we could just use code already written by somebody else? In order to demonstrate this concept

of code-borrowing, we’ll be hacking a Metasploitable VM from a Backtrack VM. Kernel linux mint First, we’ll get a basic shell on the victim server, then we’ll do some privilege escalation and get root! Also, throughout the process, we’ll be using online resources to find code that we can use in our hacks.

In order to get our basic shell, we’ll be exploiting a file upload vulnerability in the DVWA which is available through the web server provided by Metasploitable. How to learn linux kernel First, we need to open a browser (In Backtrack we have FireFox) and navigate to the DVWA. Instalar kernel linux It should reside at Home page > DVWA (Note: The user name and password is admin: password).

Linux kernel code browser Next, we navigate to the vulnerability upload page. Download linux kernel source code It should look something like this: You can also get to the upload vulnerability page by using this URI: Now that we’re at the GUI, we can discuss this vulnerability.

Linux kernel make This file upload function can allow us to upload a PHP script that will give us a basic shell on the server. Download linux kernel But, we don’t have a PHP script to do this. Linux kernel gpl So, let’s just ask Google for PHP reverse shells. Get kernel version linux Once we look this up, we can find a page from pentestmonkey with just the code we need!

The page should look like this: But, if you want to speed up the downloading process, just run this command: Now that we have a tar.gz file, we need to perform some commands in order to prepare it for uploading. Linux kernel update without reboot Let’s take a look at the commands and then we’ll explain the reason for them: First, we use the tar command with the x and f flags, this will extract the specified file. Lts linux kernel Once we extracted our tar.gz file, a new directory appeared.

Linux kernel latest version Then we entered this new directory and checked its contents, which was the PHP script that we needed. How does the linux kernel work Then, we use the mo ve command to rename the PHP script to rs.jpeg.php. Linux kernel version numbering By renaming this file, we can trick the DVWA’s upload function into accepting our PHP script as a legitimate file. Linux kernel 4 But, if we want our payload to connect back to us, we need to change some information within the script.

Latest linux kernel version It’s very simple, the lines we need to change are marked by the developer with comments. Linux kernel development Let’s see these changed values: As seen in the changed values above, we’ve set the payload to connect back to the attacking machine on port 4444. The linux kernel book Now that we’ve found and prepared our payload, let’s upload it: Now that we’ve navigated to our script, let’s upload it and see what the DVWA thinks of our file: There we go! We successfully uploaded our shell.

Linux kernel version Now, instead of keeping our browser open, let’s just figure out the URI we need to trigger and use the curl command to trigger it. Linux kernel contribution We’ll be using Netcat to control our shell once we receive the connect back. Linux kernel structure In order to do this, we’ll need to setup a listener on port 4444 before we trigger the payload with curl. Linux kernel options Let’s take a look at both of these commands: Now, when we execute the payload triggering curl command, we should receive a shell on our Netcat listener. Linux kernel latest version Let’s trigger the payload now: We have a shell!

This allows us some very restricted control of the server. Linux kernel module programming tutorial But we can do better than this, let’s do some privilege escalation and get ourselves of root shell! First, we need to find the kernel version the Metasploitable is running. Linux kernel developer jobs We can do this with the uname command: As we can see here, our victim is currently running kernel version 2.6.24. Linux kernel space Now, we can tell from this that we have a privilege escalation opportunity here.

It’s time to introduce something insanely useful, Offensive Security’s very own exploit database. Get linux kernel This database is maintained by the same people that make Kali, the successor to Backtrack. Linux kernel structure With over 35,000 exploits on archive, this database can help us on many occasions. Change linux kernel Let’s use the search option to look for an exploit for the Linux kernel 2.6. Linux lts kernel Let’s enter our query and check the CAPTCHA box, now let’s see the results: We can see here that our query returned two exploits.

Best linux kernel We’re going to be using the first result, which is a UDEV privilege escalation exploit for Linux kernel 2.6! In order to download this exploit code, we can run the following command: Now, when this exploit fires, it will run whatever file is under /tmp/run with root privileges. Linux kernel source code download That means we need to make a payload to run. Linux kernel engineer Since this is very simple, we can just whip this payload up ourselves.

Linux kernel timeline Let’s go ahead and make this payload in C: This code simply calls Netcat to connect back to the attacker on port 1337 and serve a bash shell through that connection. Linux kernel development tutorial Now that we have the code for our payload (run.c), we’re ready to move on. Install linux kernel Since these files need to be on the server in order to work, we need to find a way to move them over.

Linux kernel 3 If we start the apache2 service on our Backtrack machine, we can use the shell we already have to download the files from our attacking machine to the victim server. Latest stable linux kernel Once we start the apache web server, we need to move our files to /var/www in order for them to be accessible. Linux kernel source code Let’s prepare our apache server now: (Note: We also need move the run.c file to /var/www.) Now that we have our server started and our files in the proper places, we can download them to the victim server by using the basic shell we already have.

Linux kernel open source Let’s transfer our files now: Since we have the permissions of the DVWA web application, we only have permission to write files in the /var/www directory. Embedded linux kernel Now that we have our files downloaded, we can prepare for the exploit. Kernel thread linux First, we need to prepare the payload and put it in the proper place (/tmp/run). Linux kernel v2 Let’s prepare our payload now: We can see here that we use the GNU GCC compiler to compile our run.c file into an executable named run. Best linux kernel book We then move this executable to /tmp, and that concludes the preparation of our payload. How to become a linux kernel developer Now that we’ve prepared our payload, let’s get our exploit ready to fire: Nothing much to see here, we just used the same compiler to compile our exploit into another executable.

Smallest linux kernel Now, in order to this exploit to work, we need to know the process ID of the process we’re going to attack. Linux kernel network We can find the PID of this process by reading the contents of /proc/net/netlink. Linux kernel install Let’s read this file now: We can see by the results above that the only PID we see in the netlink file is 2293.

Make linux kernel This is the PID of the process we’re going to attack. Linux kernel module Now that we have everything in place and ready, we can launch our second attack. Git linux kernel But before we do, we need to setup another Netcat listener to catch our root shell: Now that we have our listener ready, let’s move back to our shell on the victim and launch our exploit: Now that we’ve fired our exploit, let’s go back to our Netcat listener and see if we caught anything: There we have it, we have a root shell!

I know we talked about a lot of different things today, but here’s the gist; being able to find and use preexisting exploit code can be an incredibly valuable skill. Linux kernel download It will not only save you time, but it allows you diagnose exactly what is wrong with the target. Linux kernel list Today we proved that public exploit code can be used for some very powerful things. Types of kernel in linux I’ll see you next time!