Github hackthebox walkthroughs

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Github hackthebox walkthroughs

GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.

Machines writeups until March are protected with the corresponding root flag. But since this date, HTB flags are dynamic and different for every user, so is not possible for us to maintain this kind of system. So from now we will accept only password protected challenges and retired machines that machine write-ups don't need password. It is totally forbidden to unprotect remove the password and distribute the pdf files of active machines, if we detect any misuse will be reported immediately to the HTB admins.

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Anyway, all the authors of the writeups of active machines in this repository are not responsible for the misuse that can be given to the corresponding documents. Please think that this is done to share techniques not for spoilers. In this way, you will be added to our top contributors list see below and you will also receive an invitation link to an exclusive Telegram group where several hints not spoilers are discussed for the HacktheBox machines.

Please consider protecting the text of your writeup e. Of course, if someone leaks a writeup of an active machine it is not the responsibility of the author. If we detect someone who does it, they will immediately report to the HTB Staff so they can take the appropriate measures. Note: the minimum requirement to enter the "special" Telegram group is also to have a hacker level or higher no script kiddies. Hack the Box is a superb platform to learn pentesting, there are many challenges and machines of different levels and with each one you manage to pass you learn a new thing.

But talking among ourselves we realized that many times there are several ways to get rooting a machine, get a flag That's why we created this repository, as a site to share different unofficial writeups to see different techniques and acquire even more knowledge.

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That is our goal and our passion, to share to learn together. Some people have been distrustful because in this repository there are writeups of active machines, even knowing that absolutely each one of them is protected with the corresponding password root flag or challenge.

But We did not want to give up this because we think the most interesting thing for a HTB player is to check other users' walkthroughs right after they get it, that is, not wait for weeks or months afterwards.

For this reason, we have asked the HTB admins and they have given us a pleasant surprise: in the future, they are going to add the ability for users to submit writeups directly to HTB which can automatically be unlocked after owning a machine. And also, they merge in all of the writeups from this github page.

Introduction

Simply great! Therefore it is a real pride that they have decided to include the functionality of this repo directly on their platform. When this is done, this Github will be migrated and will be inactive but with a pleasantly fulfilled mission. Until then, Keep pushing!This post describes multiple attacks upon the Optimum box on hackthebox. This is a particularly interesting box. Getting a shell is easy, perhaps one of the easiest on the site, but escalating evades a number of people, despite, in theory, also being very easy.

Originally, I cracked this box in a non-intended manner, so there are multiple ways of achieving the same result. With that out of the way, lets get onto the exploitation. So this gives us one service, a HFS file server.

A quick search reveals that this version, v2. I tried the powershell exploit and the metasploit onebut nothing gave me a shell.

Exploiting the metasploit module requires a number of different options set. Firstly, we need to ensure we have a 64 bit meterpreter.

We can just set this before we run the rejetto hfs exploit to give us a shell. So lets background the shell and load up this module. From this, we see that the machine has two targets, one for x86 and one for x An absolutely fantastic tool is windows-exploit-suggester. It takes the list of patches output by systeminfo, and compares this to a database of microsoft patches, attempting to supply a list of exploits to target the machine.

This is an inefficient method, but at the time whilst desperately searching for an exploit, it gave me a way of more effectively targeting my search. But luckily, very shortly down the list, is MS, which gave me a shell, and them promptly crashed the box once I exited.

So nowhere near as stable as MS but another entry point into the box. Exploiting this was simply a matter of downloading the executable from the remote site we probably should compile it ourselves in futureusing meterpreter to upload and then running the executable. Introduction This is a particularly interesting box. This must be an address on the local machine or 0. All rights reserved.It is necessary to change the permissions on the key file otherwise you have to enter a password!

Search packetstrom for Shellcode. Skip to content.

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Instantly share code, notes, and snippets. Code Revisions 41 Stars 25 Forks 7. Embed What would you like to do? Embed Embed this gist in your website.

Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. Cheatsheet for HackTheBox. Because a smart man once said: Never google twice. Save Request to File. Now you know you have at X the EIP override and so much space in the buffer. Simple exploit developement Get Information about the binary. Remember to use correct architecture. Work in progress above Crack openssl encrypted files!

Or try to grep the content. Pass the hash smb With nt hash the --pw-nt-hash flag is needed, default is ntlm! Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.I will hereafter describe the steps that I took to solve the Bashed challenge and end with some brief reflections on how the content of the challenge could apply to reality.

In the grand scheme of hacking challenges, this one is quite simple. There might not be a lot here for an advanced operator to dig into. Nonetheless, Bashed is entertaining and a good way for beginners to discover some enumeration and hacking techniques, so I'll continue. This command tells me which TCP ports are open, attempts to discover which specific software versions are bound to those ports, and uses nmap's default set of NSE scripts to perform some basic enumeration of the discovered services.

Note the useful tidbit provided by nmap's http-title script: this appeared to be a development website. Good to know. UDP scans revealed nothing.

github hackthebox walkthroughs

With only one service exposed on the box, it was obvious that enumerating the web content hosted on port 80 would be the next step. I first browsed the web content manually to see what I could see: A developer was blogging about developing a penetration testing tool on the same server that hosts this web content. Although not a substitute for more comprehensive tools like dirb and DirBusternmap's http-enum script is a fast and simple forced browsing utility capable of discovering web directories with common names.

I often run it as part of a scripted reconnaissance process to see if it will produce any quick finds I can investigate while one of the aforementioned slower tools runs in the background. In this case, it actually discovered all of the content that was the key to compromising the target: In a real scenario, I'd eventually want to check all of the above directories and see if they contain vulnerable content or sensitive information.

Let's navigate to it and see. Okay, so phpbash is basically a web shell that allows me to run arbitrary Linux system commands on the webserver and view the results. Obviously this could be used to compromise the system.

In a real-world pentest, you'd probably use this initial command execution to place your own shell or backdoor on the system and execute it, as you never know when someone might take this web shell down, take the web daemon down, etc. However, for the purposes of this challenge, I found it okay to just continue using this shell.

Based on the commands I ran above, I already had the gist of where a bit Ubuntu system and who an unprivileged web daemon account I was. Next, I wanted to get my bearings a bit and search for basic privilege escalation vectors. One of the first things I always check on that front is the sudo configuration of my user account.

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This indicates that I could run commands as the scriptmanager user. I kept that in the back of my head as I continued looking for interesting files on the system. It wasn't long before a huge reward was presented: How convenient. This means the script runs every minute. The owner of the file is scriptmanager.

I could effectively become scriptmanager, so I could modify the script. Again, in reality, you'd use this vulnerability to run a shell or backdoor with root privileges and demonstrate that you effectively control the system. Our goal in this challenge is simply to show that we could have controlled the system by doing something that only the root user could do.

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I solved the root portion of the challenge using the method shown below. It was a little heavy-handed, but it was quick and effective.

This series of commands overwrote test. This command dumped the contents of root. That's all for this one! We've retrieved both flags and solved the challenge. Lessons Learned The scenario laid out in this challenge is exaggerated in many regards. I imagine that finding a ready-to-use shell waiting for you on a system in the real world would be akin to finding a unicorn.Ready for the writeup I wrote up of Writeup?

Any of my attempts to brute-force directories is foiled by this DoS protection. Luckily, the nmap output shows that robots. The bottom of the page mentions that the site was not made with vim. I take this as a hint to dig into what the site was actually built with. The copyright ends atso I can assume that the CMS is updated to at least the version as well.

The script enumerates the site for a username and password hash using blind time-based SQL injection. But first, I need to verify a couple of things, such as: Where even is the uname binary located? I run id to see if jkr is part of this group.

HackTheBox - Optimum

So we should be good! To do this, I exit my SSH session and initiate a new one. To get a root shell, just turn the uname binary into a reverse shell payload.

github hackthebox walkthroughs

I use vi to create a new uname binary that initiates a socat reverse shell. I exit and re-enter the SSH session to trigger the uname command. Nmap done: 1 IP address 1 host up scanned in All rights reserved.

SQL injection exploit The script enumerates the site for a username and password hash using blind time-based SQL injection. Last login: Mon Sep 30 from Please enable JavaScript to view the comments powered by Disqus. Theme by Jacob Tomlinson.Graduate student Northeastern university, pursuing Master of Science in Cybersecurity. I'm a cybersecurity enthusiast and a student with broad interests in computer systems, IoT and software security.

Tags: insanemachineswindows. Categories: hacktheboxwalkthrough. Updated: March 10, This machine was absolutely insane, mind boggling and fun at the same time.

It took me a lot of painful days to own this machine but eventually, hard work wins. It was definitely not easy to enumerate mainly due to the slow speed and also the way things had to be located. Nonetheless, an awesome machine for learning. Before following this walkthrough, I highly recommend trying to get the flag yourself! Just like you will hear from everyone else, try harder!

I always like to check the low-hanging fruit first. This is a common misconfiguration for FTP logins. You never know what you might find but always is useful. I created a copy of the FTP data on my local drive. So, I used this software to try and load the data from the. I copied the pbox. After executing the pbox client we just downloaded for Linux, it prompted me for the password.

I guessed the password trying out adminpboxetc, got it right for password. It opened the following screen.Node is a machine focused around some of the newer technologies being utilised within web development; specifically Node. Initial exploitation and escalation puts a lot of emphasis on enumeration of misconfigurations within the custom software; rather than looking for publicly known exploits.

As there is only one externally facing service available to the user, their initial point of enumeration will be the web application. The reason for this, is that the Node. To bypass this mitigation, a user can specify a custom user-agent to be used, but further action would then be required in some tools, as any unmatched routes will always serve up the application file, resulting in status code being sent back for every request.

The attacker would be able to test the credentials tom:testthis could then be automated using Burp or any other similar application to enumerate through a password list such as rockyou.

github hackthebox walkthroughs

An alternative to brute forcing the passwords, would be to simply take a look at the output from the API that is called to get the latest users, as the attacker would then see that the entire user document is being output, exposing the hash. As the passwords for the users are weak, except rastatingthey can easily be found in a reverse SHA lookup. Should the attacker gain access to one of the three low level web accounts, they will soon find out they have no functionality available to them, as per the below screenshot:.

However, knowing how to brute force the accounts is needed for the next step, so will still provide the user something of use. This brings the attacker back to the point of needing to enumerate the web service as mentioned earlier. If the attacker visits the route with no parameter, i. Once the attacker has the admin username, they can then repeat the previous steps and brute force the weak password manchesterlogin, and download a backup of the website.

Upon examination, the attacker will be able to see it contains one large base64 string. Once back in the original ZIP format, the password for the ZIP file magicword can be easily cracked using a tool such as fcrackzip :. The file that has the important information is app.

Taking a look at the users of the admin group will show that tom is in this group, and as tom is also the account that has access to user. The only intended way to reach this account, is by looking at the currently running services. The service is very small, and consists of a single file app. Once connected to the database, it will open the tasks collection, find all the documents contained within it, iterate through them, and pass the value of the cmd property to the exec function, and then deleted the task to prevent re-execution.

This process is repeated every 30 seconds, indefinitely. As the service is running as tom, this gives the attacker an easy means of escalating to the tom account. To exploit this, first, the attacker must connect to the mongodb instance using the previously identified credentials by running mongo -p -u mark scheduler and then entering the password when prompted.

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From here, the attacker should simply create a new document in the tasks collection, with their desired payload as the cmd property. Now that the attacker is in the context of tom, they can read user.

Traceback Walkthrough - HackTheBox

To escalate at this point, the attacker needs to revisit some of the information found previously. If it was accessed using a SUID as per the previous section, an additional step will have to be taken, which will be modifying the SUID binary to also set the GID bit; and to change the group owner to admin for example by adding another task in mongodb like this:.


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