Nodejs ctf

As a developer, are you confident that you know what you need to know about web security? Wait, maybe you work in infosec.

nodejs ctf

As a security specialist, are you confident that the developers you work with know enough to do the right thing? Our recent Mozilla all-hands was one of those opportunities. A Capture the Flag CTF event offer a sociable hands-on way to learn about security and they are often a tradition at security conferences.

Juice Shop uses modern technologies like Node. This was important for us since our participants had a wide range of skills, and included developers with little formal security training to professional penetration testers. These can then be uploaded to a central scoring server. The CTF mode also disables the hints which might have made some of the challenges too easy for our more advanced players.

Juice Shop can be run in a wide variety of ways, but to make it easy for your participants I recommend using a docker imageas this has only one dependency: docker. You can customization instructions online. We enabled the built-in CTF mode and changed the application name and the example products in order to make it feel more Firefox-y and to hide its origin as solutions for the Juice Shop challenges are easily found on the internet.

It definitely helped encourage competition among our participants!

Hands-On Web Security: Capture the Flag with OWASP Juice Shop

A scoring server should also provide a summary of each of the challenges and the points each challenge is worth. Although some of the Juice Shop security challenges can be solved just by using Firefox, a security tool that proxies your browser will really help. ZAP sits between your browser and the application you want to test and shows all of the traffic that flows between them.

It also allows you to intercept and change that traffic and provides a wide range of automated and manual features that can be used to test the application. Suggest that they start with the easiest challenges w the ones with the fewest points and work upwards, as the challenges are designed to get progressively harder. We set up a private irc channel, a Google group, and held daily check-in sessions where anyone could come along and ask us questions about the event, and get help on solving the challenges.

Running a Capture the Flag event is a great way to raise security awareness and knowledge within a team, a company, or an organization. Juice Shop is an ideal application for a CTF as its based on modern web technologies and includes a wide range of challenges. Note: It has already been updated since we forked our copy. Not surprisingly 2 of our pen testers who took part did very well, but they were given a run for their money by one of our operations staff who clearly knows a lot about security!

Do you have a knack for uncovering security vulnerabilities? We welcome your help in making Mozilla even more secure. You could even earn some bounty rewards for your efforts. More articles by Simon Bennetts…. Please check your inbox or your spam filter for an email from us. Great writeup!It can be used in security trainings, awareness demos, CTFs and as a guinea pig for security tools! Juice Shop is written in Node. The application contains a vast number of hacking challenges of varying difficulty where the user is supposed to exploit the underlying vulnerabilities.

The hacking progress is tracked on a score board. Finding this score board is actually one of the easy challenges! Hence the project name. A live update of the project contributors is found here. The most trustworthy online shop out there. If you are entirely new to the Juice Shop, we recommend doing them in the listed order. This interactive utility allows you to populate a CTF game server in a matter of minutes.

The following open source CTF frameworks are supported by juice-shop-ctf-cli :. It will give you a complete overview of the vulnerabilities found in the application including hints how to spot and exploit them. In the appendix you will even find complete step-by-step solutions to every challenge.

For support or feature requests please use the support channels or issue trackers mentioned by these projects. You want to appear on this list? In order to be recognized as a corporate code sponsor an offical written confirmation of waiving all IP to the contributed code is required. Please help us make the Juice Shop even better for you by answering our user questionnaire!

Description Juice Shop is written in Node. Watch Star. The OWASP Foundation works to improve the security of software through its community-led open source software projects, hundreds of chapters worldwide, tens of thousands of members, and by hosting local and global conferences.

Students applying must come up with their own ideas this year. Please further note that we will most likely not select any "I will add xx challenges Score Board. Bonus Payload.

nodejs ctf

Privacy Policy. Login Admin. Password Strength. View Basket. Forged Feedback. Login Jim. Login Bender.This challenge, specifically, had an implementation of safe-eval version 0.

I was hesitant about using another Microsoft product muh telemetries!? This editor has become my go-to for everything. It easily beats TextEdit. The first step is getting it installed.

Remote Debugging Node.js with VS Code

Built on open source. Runs everywhere. Follow the instructions for your platform, install it, and launch it. Look at that beautiful editor, marvel at it. You like Java? If you attempt to do any debugging without first opening a file what exactly are you expecting here? If you click that button, launch. If it asks you which environment to choose, select Node. At its core, that is the list of configurations you can use to debug a Node.

What we need to do is add a configuration for remote debugging. The default debugging configuration for Node. By binding to that address You can confirm this by launching node with --inspect and observing the following. You can further confirm this by inspecting the output of netstat -ant or the equivalent on your platform and seeing that it specifically binds to This is a good thing!

That stands for WebSocket. WebSockets are increasingly how the active web content world tends to work, but more importantly, the traffic is sent in the clear. The best way to ensure we are as secure as we can be is to employ an SSH tunnel.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. You can use this library to implement authentication for your website and take advantage of the already existing features that 7Pass SSO offers.

Before we get started setting it up, you need your web application's client. The client represents the entity which is associated with a service you want to authenticate to. Edit the config. You should have all of the parameters at your disposal after your client is set up. For testing, keep the environment set to qa. Once that's done, you can start the application:. The application will guide you through the most common use cases of the library and show you code examples and server responses along the way.

You strongly encouraged to go over the example application first. It will show you the API calls with more comments and real values. It will also show you the real responses from the 7Pass SSO service as you progress.

To use the library, it's necessary to initialize it with the credentials of the client we want to use. If you don't have the credentials yet, please see above. If you're starting the development, it's always a good idea to work against a non live instance of the 7Pass SSO service. To specify the instance the environment against which you want to issue the requests, you can pass an additional key called environment to the configuration.

There are currently two environments running: QA and production. Don't forget to switch to the production version before you release your application to the public.

If needed, this can be overwritten by specifying host in the configuration as below:. The application will then use the code in order to get the user's details. The process may vary depending on the passed options. The library automatically handles the generation of the URL to which the user needs to be redirected. The URL needs to be absolute and can be arbitrary given that it is registered to the client but will by convention lead to the same host and a route called "callback".

Use of state parameter is optional but recommended to avoid CSRF attacks. The user might have successfully authenticated but also might have decided to cancel the process or some other error might have happened.

Therefore it's important have proper error handling.Please remember that VulnHub is a free community resource so we are unable to check the machines that are provided to us. Before you download, please read our FAQs sections dealing with the dangers of running unknown VMs and our suggestions for "protecting yourself and your network. If you understand the risks, please download! Description: Node is a medium level boot2root challenge, originally created for HackTheBox.

There are two flags to find user and root flags and multiple different technologies to play with. Node: 1 Twitter Facebook Email. This mentions the name of this release, when it was released, who made it, a link to 'series' and a link to the homepage of the release.

It's common for an author to release multiple 'scenarios', making up a 'series' of machines to attack.

Download Back To The Top. Here you can download the mentioned files using various methods. We have listed the original sourcefrom the author's page. For these reasons, we have been in touch with each author asking for permission to mirror the files. If the author has agreed, we have created mirrors.

These are untouched copies of the listed files. See how here. We also offer the download via BitTorrent. We prefer that people use BitTorrent, however, we do understand that it is not as straight forward as clicking on a direct link.

To make sure everyone using VulnHub has the best experience possible using the site, we have had to limit the amount of simultaneous direct download files to two files, with a max speed of 3mb. Description Back To The Top. Useful to help you get started and it shouldn't give anything away that you quickly could find out for yourself.

Filename : Node. To make sure that the files haven't been altered in any manner, you can check the checksum of the file. Some authors publish the checksums in the README files, on their homepages or sometimes inside compressed archive if it has been compressed.

You can find all the checksums hereotherwise, they will be individually displayed on their entry page. To check the checksum, you can do it here.First, I apologize for not putting the period in Node. Gabe suggested this challenge to me as a fun one, and I believe that no one else was able to solve it.

In this case, Gabe told me to take a further look into the page, to see if I could find anything. First, I found a comment mentioning the eversec-website Github repository. First, I decided to try to fuzz the password box.

nodejs ctf

While SQL Injection wasn't the correct path it has been in the past thoughI was able to eventually get an error page. After a bit of searching around, I noticed that the app. Enter my super-pro Bing skills, and it looks like there might be some sort of vulnerability in this library. Similar to the author, I received a syntax error, so I hoped that I was in business! While it should have been possible to just execute a system command, I wanted to write my reverse shell in Nodejs as well!

First, I found a gist for a Nodejs reverse shell, that looked like it would solve my problem perfectly. After a bit more searching, I found another possible reverse shell. As before, I minimized and then encoded the payload. Note that this article is actually where I got the idea to eval the encoded strings.

With my netcat listener in place, I was able to get a reverse shell from this attack! I also grabbed the two flags that I could find.

While the write-up is a little late, I wanted to make sure that it could be used at a few other cons. Search for:.I authored BabyJS challenge for Nullcon HackIM CTF this year, the idea was not to go with common vulnerability classes like sqli, lfi, rce… but rather choose something interesting and new. Right after the CTF i wanted to look more into the current npm packages that offer sandboxing and what kind of bypasses they are affected with.

In this blog post, i am going to explain why sandboxing nodejs is a hard problem and not a great standalone solution for security.

JavaScript Security: Hide your Code?

I am new to javascript, i am no where near to the guys who found bypasses like - this. A sandbox is an isolated environment that enables secure execution of untrusted code, without affecting the actual code outside of it.

So lets look at what it has to offer. Using VM module one can run the code in a sandboxed environment. The sandboxed code uses a different V8 Context, meaning that it has a different global object than the rest of the code.

Using Vm module we can run untrusted code in a seperate context meaning it wont be able to access the main node process right? Process is not defined, so the VM Module doesnt allow access to process by default, if you want it you have to specifically give it. In javascript this keyword refers to the object it belongs to, so if we use this its already pointing to an object outside of the VM Context. So accessing. Function constructor is like the highest function javascript gives, it has access to global scope, hence it can return any global things Function constructor allows you to generate a function from a string and therefore execute arbitrary code.

This was the same trick used for the first Angular breakout escape as well. More about Function Constructor here and here. Now that we have access to process we can use it to get to require and then RCE. Scheduling functions setInterval, setTimeout and setImmediate are not available by default. Since VM2 contextifies all objects inside the VM Context, this keyword no longer has access to the constructor property hence our previous payload is dead.

For a bypass we will need something outside of sandbox, so that it will not be limited to the sandbox context and will have access to constructor again.

nodejs ctf

Now that all objects inside the vm are contextified, we somehow need something from outside world to climb back to process and then execute code. Well its possible thats excatly what we are going to go. In the try block we try to remove the listener on the current process doing this - this. Since the exceptions from the Host are not contextified before being passed inside the sandbox we can use the exception to climb up the tree upto require.

Afterall there have been quiet a few new and creative bypasses from Xmiliah in the VM2 - more escapes. Apart from the sandbox escapes, it was also possible to create a denial of service using infinite while loop.

Running untrusted code is hard, relying only on software modules as a sandboxing technique to completely prevent misuse of untrusted code execution is a bad decision afterall. It could be a real mess in cloud saas situations, since multiple tenants data is accessible once you are able to escape out of the sandbox process. You could sneak in into other tenants sessions, secrets etc. A far more secure option would be to depend on hardware virtualization like running each tenant code inside a seperate docker container or AWS Lambda Function as a service might also be a better choice.

Below is how Auth0 handled the sandbox problem: Sandboxing Node. Disclaimer: I am new to javascript, i am no where near to the guys who found bypasses like - this.


Comments

Add a Comment

Your email address will not be published. Required fields are marked *