mirror of
https://github.com/carlospolop/hacktricks
synced 2024-12-19 17:44:47 +00:00
273 lines
7.7 KiB
Markdown
273 lines
7.7 KiB
Markdown
# Objection Tutorial
|
|
|
|
## **Introduction**
|
|
|
|
[](https://github.com/sensepost/objection)
|
|
|
|
**objection - Runtime Mobile Exploration**
|
|
|
|
`objection` is a runtime mobile exploration toolkit, powered by [Frida](https://www.frida.re). It was built with the aim of helping assess mobile applications and their security posture without the need for a jailbroken or rooted mobile device.
|
|
|
|
**Note:** This is not some form of jailbreak / root bypass. By using `objection`, you are still limited by all of the restrictions imposed by the applicable sandbox you are facing.
|
|
|
|
### Resume
|
|
|
|
The **goal** of **objection** is let the user call the **main actions that offers Frida**. **Otherwise**, the user will need to create a **single script for every application** that he wants to test.
|
|
|
|
## Tutorial
|
|
|
|
For this tutorial I am going to use the APK that you can download here:
|
|
|
|
{% file src="../../../.gitbook/assets/app-release.zip" %}
|
|
|
|
Or from its [original repository ](https://github.com/asvid/FridaApp)(download app-release.apk)
|
|
|
|
### Installation
|
|
|
|
```
|
|
pip3 install objection
|
|
```
|
|
|
|
### Connection
|
|
|
|
Make a **regular ADB conection** and **start** the **frida** server in the device (and check that frida is working in both the client and the server).
|
|
|
|
If you are using a **rooted device** it is needed to select the application that you want to test inside the _**--gadget**_ option. in this case:
|
|
|
|
```
|
|
objection --gadget asvid.github.io.fridaapp explore
|
|
```
|
|
|
|
### Basic Actions
|
|
|
|
Not all possible commands of objections are going to be listed in this tutorial, only the ones that I have found more useful.
|
|
|
|
#### Environment
|
|
|
|
Some interesting information (like passwords or paths) could be find inside the environment.
|
|
|
|
```
|
|
env
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### Frida Information
|
|
|
|
```
|
|
frida
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### Upload/Download
|
|
|
|
```bash
|
|
file download <remote path> [<local path>]
|
|
file upload <local path> [<remote path>]
|
|
```
|
|
|
|
#### Import frida script
|
|
|
|
```bash
|
|
import <local path frida-script>
|
|
```
|
|
|
|
#### SSLPinning
|
|
|
|
```bash
|
|
android sslpinning disable #Attempts to disable SSL Pinning on Android devices.
|
|
```
|
|
|
|
#### Root detection
|
|
|
|
```bash
|
|
android root disable #Attempts to disable root detection on Android devices.
|
|
android root simulate #Attempts to simulate a rooted Android environment.
|
|
```
|
|
|
|
#### Exec Command
|
|
|
|
```bash
|
|
android shell_exec whoami
|
|
```
|
|
|
|
#### Screenshots
|
|
|
|
```bash
|
|
android ui screenshot /tmp/screenshot
|
|
android ui FLAG_SECURE false #This may enable you to take screenshots using the hardware keys
|
|
```
|
|
|
|
### Static analysis made Dynamic
|
|
|
|
In a real application we should know all of the information discovered in this part before using objection thanks to **static analysis**. Anyway, this way maybe you can see **something new** as here you will only have a complete list of classes, methods and exported objects.
|
|
|
|
This is also usefull if somehow you are **unable to get some readable source code** of the app.
|
|
|
|
#### List activities, receivers and services
|
|
|
|
```
|
|
android hooking list activities
|
|
```
|
|
|
|
.png>)
|
|
|
|
```
|
|
android hooking list services
|
|
android hooking list receivers
|
|
```
|
|
|
|
Frida will launch an error if none is found
|
|
|
|
#### Getting current activity
|
|
|
|
```
|
|
android hooking get current_activity
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### Search Classes
|
|
|
|
Lets start looking for classes inside our application
|
|
|
|
```
|
|
android hooking search classes asvid.github.io.fridaapp
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### Search Methods of a class
|
|
|
|
Now lets extract the methods inside the class _MainActivity:_
|
|
|
|
```
|
|
android hooking search methods asvid.github.io.fridaapp MainActivity
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### List declared Methods of a class with their parameters
|
|
|
|
Lets figure out wich parameters does the methods of the class need:
|
|
|
|
```
|
|
android hooking list class_methods asvid.github.io.fridaapp.MainActivity
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### List classes
|
|
|
|
You could also list all the classes that were loaded inside the current applicatoin:
|
|
|
|
```
|
|
android hooking list classes #List all loaded classes, As the target application gets usedmore, this command will return more classes.
|
|
```
|
|
|
|
This is very useful if you want to **hook the method of a class and you only know the name of the class**. You coul use this function to **search which module owns the class** and then hook its method.
|
|
|
|
### Hooking being easy
|
|
|
|
#### Hooking (watching) a method
|
|
|
|
From the [source code](https://github.com/asvid/FridaApp/blob/master/app/src/main/java/asvid/github/io/fridaapp/MainActivity.kt) of the application we know that the **function** _**sum()**_ **from** _**MainActivity**_ is being run **every second**. Lets try to **dump all possible information** each time the function is called (arguments, return value and backtrace):
|
|
|
|
```
|
|
android hooking watch class_method asvid.github.io.fridaapp.MainActivity.sum --dump-args --dump-backtrace --dump-return
|
|
```
|
|
|
|
.png>)
|
|
|
|
#### Hooking (watching) an entire class
|
|
|
|
Actually I find all the methods of the class MainActivity really interesting, lets **hook them all**. Be careful, this could **crash** an application.
|
|
|
|
```
|
|
android hooking watch class asvid.github.io.fridaapp.MainActivity --dump-args --dump-return
|
|
```
|
|
|
|
If you play with the application while the class is hooked you will see when **each function is being called**, its **arguments** and the **return** value.
|
|
|
|
.png>)
|
|
|
|
#### Changing boolean return value of a function
|
|
|
|
From the source code you can see that the function _checkPin_ gets a _String_ as argument and returns a _boolean_. Lets make the function **always return true**:
|
|
|
|
.png>)
|
|
|
|
Now, If you write anything in the text box for the PIN code you will see tat anything is valid:
|
|
|
|
.png>)
|
|
|
|
### Class instances
|
|
|
|
Search for and print **live instances of a specific Java class**, specified by a fully qualified class name. Out is the result of an attempt at getting a string value for a discovered objection which would typically **contain property values for the object**.
|
|
|
|
```
|
|
android heap print_instances <class>
|
|
```
|
|
|
|
.png>)
|
|
|
|
### Keystore/Intents
|
|
|
|
You can play with the keystore and intents using:
|
|
|
|
```
|
|
android keystore list
|
|
android intents launch_activity
|
|
android intent launch_service
|
|
```
|
|
|
|
### Memory
|
|
|
|
#### Dump
|
|
|
|
```bash
|
|
memory dump all <local destination> #Dump all memory
|
|
memory dump from_base <base_address> <size_to_dump> <local_destination> #Dump a part
|
|
```
|
|
|
|
#### List
|
|
|
|
```
|
|
memory list modules
|
|
```
|
|
|
|
.png>)
|
|
|
|
At the bottom os the list you can see frida:
|
|
|
|
.png>)
|
|
|
|
Lets checks what is frida exporting:
|
|
|
|
.png>)
|
|
|
|
#### Search/Write
|
|
|
|
You can alse search and write inside memory with objection:
|
|
|
|
```
|
|
memory search "<pattern eg: 41 41 41 ?? 41>" (--string) (--offsets-only)
|
|
memory write "<address>" "<pattern eg: 41 41 41 41>" (--string)
|
|
```
|
|
|
|
### SQLite
|
|
|
|
You cals can use the command `sqlite` to interact with sqlite databases.
|
|
|
|
### Exit
|
|
|
|
```
|
|
exit
|
|
```
|
|
|
|
## What I miss in Objection
|
|
|
|
* The hooking methods sometimes crashes the application (this is also because of Frida).
|
|
* You can't use the instaces of the classes to call functions of the instance. And you can't create new instances of classes and use them to call functions.
|
|
* There isn't a shortcut (like the one for sslpinnin) to hook all the common crypto methods being used by the application to see cyphered text, plain text, keys, IVs and algorithms used.
|