Frida ctf

After watching the two or three first videos I decided to use the same game to explain some aspects of Frida and how this amazing project can save your ass at your work. So in this article we are going to build a cheat that will helps us in the game. Takeaways for the reader:. First of all, please check this link in order to setup a server instance. The first step should be to launch the client, register a new player, and start exploring the world.

After you spent some minutes moving around the map and checking the HUD mana, life, items… it is time to move on and get our hands dirty with the terminal. With the game running, do a ps -aux and check the name of the main binary used for the client: PwnAdventure3-Linux-Shipping. We can use ldd to list easily all the shared objects used by the binary:. In order to dump all the exports and translate the name we are going to use a small script that uses Frida and cxxfilt:.

What are we doing here? We are attaching ourself to the running game process PwnAdventure3-Linux-Shippingthen we create a script JavaScript where the main logic lies.

In the python we just call cxxfilt. Now we have a nice dump of useful information where we can perform searchs. For example let search for methods related with speed:.

Usually we are not going to need to use the cheats all the time. Maybe we only want to increment our walking speed to travel long distances, but inside buildings we want the normal speed, or even to teleport ourself to another location we need to pass the coordinates as argument.

To solve it, the best option is to use the game chat. To check it, we are going to hook it and log to console the content of that string:. Through Module. Now we can control two events: onEnter and onLeave the names explain itself. Inside onEnter we can snoop the arguments keep in mind that the first argument will be thisso the second argument is our pointer to string. Finally we just need to read the memory with Memory. Execute it and type in the chat something:. At this point we can type commands inside the game chat and parse it to fire the actions programmed in our cheat.

Oh, wait, what actions? Keep reading! The first thing that we want to do is to move faster. As we stated before, the binary has symbols. With GDB it is easy peasy:. As we did before with readCString, now we are using Memory. Lastly, we write the new walking speed as a float Launch it and move around the map.First I put the APK on a pen drive and rebooted back into my regular environment, created a virtual device in android studio as I was going to do this anyway and installed the APK and ran it.

I was greeted with a login screen what a handsome devil! As you can see the app lists a user name but asks for a password. A couple of likely passwords:. SQLiteBrowser is a tool that allows you to browse sqlite databases. I created an android virtual device and install the CTF app on it. Now we can create a script file that we inject into the running program, which will allow us to overwrite functionality of the program. What currently happens is the user clicks the login button and it calls the decrypt function like so:.

What we want to do is call the decrypt function to decrypt the notes field. With frida we can use the Java.

What we do then is instead of checking if the password matches, log the output of the decrypt function after passing in the notes field.

frida ctf

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frida ctf

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Please enter your email address and we will email you a new password. We want to hear what you have to say but need to verify your account. Just leave us a message here and we will work on getting you verified. Frida is a passionate, visually striking biopic about the larger-than-life artist. Tap to review this movie.

Rate this movie. Oof, that was Rotten. Meh, it passed the time. So Fresh: Absolute Must See! You're almost there! Just confirm how you got your ticket. AMC Coming Soon. Cinemark Coming Soon. Regal Coming Soon. By opting to have your ticket verified for this movie, you are allowing us to check the email address associated with your Rotten Tomatoes account against an email address associated with a Fandango ticket purchase for the same movie.

Smart, willful, and perverse, this Frida is nobody's servant, and the tiny Hayek plays her with head held high. You may want to laugh now and then, but you won't look away. David Denby. Salma Hayek finally ushered her dream project into production, but her impassioned lead performance lacks the necessary gravitas for the role, mistaking empty energy for wild fits of inspiration. Scott Tobias. The plodding, glumly literal screenplay holds this otherwise expressive biopic back, but it's still a colourful and entertaining watch.

Julie Taymor. It wasn't a bad idea to conceive of the film as an epic, complex love story between Frida and Rivera, but the passion between them is more rhetorical than palpable Taymor and Hayak give us only the rough sketch of a wild soul.

David Ansen. While Frida is no masterpiece, it's nevertheless worth the price of admission to see Hayek master her craft. Stella Papamichael. Taymor's triumph is that her film, despite its distance from us in some ways, is pertinent and enthralling. Stanley Kauffmann.In addition to belonging to the post-revolutionary Mexicayotl movement, which sought to define a Mexican identity, Kahlo has been described as a surrealist or magical realist.

Although she was disabled by polio as a child, Kahlo had been a promising student headed for medical school until she suffered a bus accident at the age of eighteen, which caused her lifelong pain and medical problems.

During her recovery she returned to her childhood hobby of art with the idea of becoming an artist. Kahlo's interests in politics and art led her to join the Mexican Communist Party in[1] through which she met fellow Mexican artist Diego Rivera. The couple married in[1] [4] and spent the late s and early s travelling in Mexico and the United States together.

During this time, she developed her artistic style, drawing her main inspiration from Mexican folk cultureand painted mostly small self-portraits which mixed elements from pre-Columbian and Catholic beliefs. While the French exhibition was less successful, the Louvre purchased a painting from Kahlo, The Framemaking her the first Mexican artist to be featured in their collection.

Kahlo's always-fragile health began to decline in the same decade. She had her first solo exhibition in Mexico inshortly before her death in at the age of Kahlo's work as an artist remained relatively unknown until the late s, when her work was rediscovered by art historians and political activists.

Kahlo's work has been celebrated internationally as emblematic of Mexican national and indigenous traditions and by feminists for what is seen as its uncompromising depiction of the female experience and form.

After a bus accident in left Kahlo unable to walk for three months, she started to consider a career as a medical illustrator, which would combine her interests in science and art. She had a specially-made easel that enabled her to paint in bed, and a mirror placed above it so that she could see herself. Most of the paintings Kahlo made during this time were portraits of herself, her sisters, and her schoolfriends. On moving to Morelos in with her husband Rivera, Kahlo was inspired by the city of Cuernavaca where they lived.

On moving to Detroit with Rivera, Kahlo experienced numerous health problems related to a failed pregnancy. She experimented with different techniques, such as etching and frescos[32] and her paintings began to show a stronger narrative style. Upon returning to Mexico City in Kahlo made no new paintings, and only two in the following year, due to health complications.

She painted more "than she had done in all her eight previous years of marriage", creating such works as My Nurse and IMemory, the HeartFour Inhabitants of Mexicoand What the Water Gave Me He was impressed by Kahlo, immediately claiming her as a surrealist and describing her work as "a ribbon around a bomb".

In October, Kahlo traveled alone to New York, where her colorful Mexican dress "caused a sensation" and made her seen as "the height of exotica". Conger Goodyearthen the president of the MoMA, and Clare Boothe Luce, for whom she painted a portrait of Luce's friend, socialite Dorothy Halewho had committed suicide by jumping from her apartment building.

The exhibition opened in March, but received much less attention than she had received in the United States, partly due to the looming Second World Warand made a loss financially, which led Kahlo to cancel a planned exhibition in London.

picoCTF 2018 - be-quick-or-be-dead-2 // solved with gdb & radare2

In the United States, Kahlo's paintings continued to raise interest. Kahlo gained more appreciation for her art in Mexico as well. She became a founding member of the Seminario de Cultura Mexicana, a group of twenty-five artists commissioned by the Ministry of Public Education in to spread public knowledge of Mexican culture. She was invited to participate in "Salon de la Flor", an exhibition presented at the annual flower exposition. The same year, the group created murals for Posada del Sol, a hotel in Mexico City.

However, it was destroyed soon after completion as the owner did not like it.

frida ctf

Kahlo struggled to make a living from her art until the mid to late s, as she refused to adapt her style to suit her clients' wishes. She did not complete the first one, possibly due to her dislike of the subject, and the second commission was rejected by the commissioning body.

Even as Kahlo was gaining recognition in Mexico, her health was declining rapidly, and an attempted surgery to support her spine failed. Mainly because I want to make it useful to the revolutionary communist movement I must struggle with all my strength to ensure that the little positive my health allows me to do also benefits the Revolution, the only real reason to live.

To the surprise of the guests, she arrived in an ambulance and was carried on a stretcher to the bed, where she stayed for the duration of the party.With that in mind, this blog post is meant to cover some quick tips for how to go about developing or fixing frida's code base. Mostly so I can reference it later once I forget how it works again Read more: frida development notes. This challenge was actually a re-release of the original challenge "Patch Tuesday", which the author accidentally left the flag in the original binary.

This version is more interesting and is an example of using revenge to apply a Windows patch. This specific challenge was not actually solved by me during quals. Aegis officially scored and I'm sure others helped out. That said, I like to look at challenges afterwards and identify what I could do to solve it more efficiently next time. What follows is a walk-through on solving this challenge with my revenge tool.

Hacking a game to learn FRIDA basics (Pwn Adventure 3)

This challenge was an easy reversing one, but it was made easier through revenge. Read more: CSAW beleaf.

frida ctf

First off, this challenge was listed as pts. I was the 7th to solve it with about 45 minutes left in the contest. Unfortunately, I got sucked into this and needed to finish it for my own sanity. That said, it was good challenge, just not realistically points. Read more: Harekaze Admin's Product Key. Home Tutorials Contact. CSAW beleaf. Harekaze Admin's Product Key.Please note that this is not a complete writeup for r2xor.

An Android apk file is given that contains the flag somewhere embedded into it. Based on the challenge name, it can be assumed that the flag is stored as a XOR encrypted value somewhere in the app, along with a static decryption key for it. The plan is to instrument the app using Frida in order to dump the flag.

This is possible because the app uses the function:. It takes two string pointer parameters: A pointer to the user input and a pointer to the correct flag, in whichever form. By hooking this function, the expected flag value can be read and the challenge is solved. Good plan for now. The app comes bundled with a native library called libnative-lib.

Therefore hooking has to be performed in this native library. Also, the app checks whether the device its running on is rooted. This runs x86 based pre-rooted Android devices on a local machine and exposes an adb port for easy shell access.

Frida comes with both a server and a client component. Therefore the next thing to prepare is a new pipenv with the Frida client installed. The latest Frida server release can be downloaded with the correct architecture, x86 in this case, and uploaded to the running Android device:. The last thing to do is to install r2frida using the radare2 packet manager:.

Bypass Jailbreak Detection with Frida in iOS applications

The first method that will be executed when launching the app is onCreate of the class MainActivity. This is the decompiled code of it:. The app terminates in case n returns true.

The first thing n does is creating an instance of the RootDetection class and proceeding with the root check. In order to run this app on the rooted device, it would therefore be convenient to force n to always return false — Frida to the rescue. The plan is to launch the app using Frida while replacing n with a function that just performs a return false. Frida itself spawns the app on the device, sets up the hooks, injects JavaScript code into the target process and resumes the process afterwards.

This allows various modifications to an application, such as the ones defined in the js variable. Tracing in this context means that function calls can be observed dynamically while printing the passed parameters.

Remember, all r2frida commands have to be prefixed with a slash. Now only the address of the function to be traced is required. The start address of libnative-lib. Now the address of the function to be traced can be calculated using the library start address and the offset:.In this blog post, we will have a look at Fridawhich is one of the really interesting tools for mobile application security analysis.

This is also something we cover in-depth in our Advanced Android and iOS Exploitation training for which you can register here — Training Link.

Even if you have never used Frida, this post will serve as a guide for you to get started into the world of Frida for Mobile application security analysis and exploitation. Frida is a dynamic code instrumentation toolkit allowing you to hook into applications, inject your own JavaScript while getting complete access to the memory and functions. You can join the IRC at frida on irc. The API of Frida is what makes it so powerful and a first choice for building your own security or analysis tools.

There have been several tools which are built on Frida including Needle and AppMon. One of the other things which make Frida so useful is its ability to work on non-jailbroken devices. Setting up Frida to perform iOS application security is fairly straightforward. You need to perform setup both on the iOS device as well as your host machine.

Now that we have Frida all set up, we are ready to start using Frida and start our iOS application security assessment and exploitation journey! Device is Jailbroken. As you can see from the screenshot above, we now have a list of all the running processes on our iOS device. Attaching to an iOS process using Frida.

The goal for this exercise is to identify which ViewController and function are responsible for validating whether our device is jailbroken or not — in the Jailbreak Detection exercise of DVIA. Here, we will be looking for anything related to Jailbreak, so that we are able to perform Jailbreak Bypass with the help of Frida.

Identifying target class of the iOS application with Frida. After it has found all the instances, you might see an error statement which is safe to ignore. To find the methods, we would need to use ObjC. We will also only look for methods of our target class, which in this case is JailbreakDetectionVC.

Identifying target methods of an iOS application class with Frida. Finding return value of target method.

The Challenge

Since our device is jailbroken, it shows a return value of 0x1which simply means that the function is returning True. This could be done by the following line of code which changes the return value as well as logs it to the console:. Patching function by modifying the return value in an iOS app — Jailbreak Detection bypass.

If you look in your iOS application now, it would say that the Device is not Jailbroken as shown below. That is all for this blog post. This is also something we cover in-depth in our Advanced Android and iOS Exploitation training for which you can register here — Training Link Even if you have never used Frida, this post will serve as a guide for you to get started into the world of Frida for Mobile application security analysis and exploitation.

To install Frida server on your iOS device, follow the below steps. Open Cydia app on your iOS device. Connecting to an iOS process using Frida Now that we have Frida all set up, we are ready to start using Frida and start our iOS application security assessment and exploitation journey!

Dumping Class and Method Information The goal for this exercise is to identify which ViewController and function are responsible for validating whether our device is jailbroken or not — in the Jailbreak Detection exercise of DVIA.


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