hacktricks/mobile-apps-pentesting/android-app-pentesting/react-native-application.md

46 lines
2.9 KiB
Markdown
Raw Normal View History

2021-02-01 09:24:10 +00:00
# React Native Application
2022-04-05 22:24:52 +00:00
**Information copied from** [**https://medium.com/bugbountywriteup/lets-know-how-i-have-explored-the-buried-secrets-in-react-native-application-6236728198f7**](https://medium.com/bugbountywriteup/lets-know-how-i-have-explored-the-buried-secrets-in-react-native-application-6236728198f7)
2021-02-01 09:24:10 +00:00
React Native is a **mobile application framework** that is most commonly used to develop applications for **Android** and **iOS** by enabling the use of React and native platform capabilities. These days, its become increasingly popular to use React across platforms.\
2021-02-01 09:24:10 +00:00
But most of the time, the core logic of the application lies in the React Native **JavaScript that can be obtained** without needing to use dex2jar.
2021-08-09 12:26:47 +00:00
### **Step-1**: Lets confirm whether the application was built on React Native framework.
2021-02-01 09:24:10 +00:00
To check this, rename the APK with zip extension and then extract the APK to a new folder using the following command
```
2021-02-01 09:24:10 +00:00
cp com.example.apk example-apk.zip
unzip -qq example-apk.zip -d ReactNative
```
Browse to the newly created `ReactNative` folder, and find the `assets` folder. Inside this folder, it should contain `index.android.bundle`. This file will contain all of the React JavaScript in a **minified format.**React Native Reverse Engineering
2021-11-03 10:22:49 +00:00
```bash
find . -print | grep -i ".bundle$"
```
![Image for post](https://miro.medium.com/max/1559/1\*enjF2H7PclRAIcNCxDIOJw.png)
2021-02-01 09:24:10 +00:00
2021-08-09 12:26:47 +00:00
### **Step-2**: Creating a file named `index.html` in the same directory with the following code in it.
You can upload the file to [https://spaceraccoon.github.io/webpack-exploder/](https://spaceraccoon.github.io/webpack-exploder/) or proceed with the following steps:
2021-02-01 09:24:10 +00:00
2021-05-09 14:39:07 +00:00
```markup
2021-05-09 14:52:12 +00:00
<script src="./index.android.bundle"></script>
2021-02-01 09:24:10 +00:00
```
![Image for post](https://miro.medium.com/max/1526/1\*Qrg2jrXF8UxwbbRJJVWmRw.png)
2021-02-01 09:24:10 +00:00
Open the **index.html** file in **Google Chrome**. Open up the Developer Toolbar (**Command+Option+J for OS X or Control+Shift+J for Windows**), and click on “Sources”. You should see a JavaScript file, split up into folders and files that make up the main bundle.
2021-02-01 09:24:10 +00:00
> If you are able to find a file called `index.android.bundle.map`, you will be able to analyze the source code in an unminified format. `map` files contain the source mapping that allows you to map minified identifiers.
2021-08-09 12:26:47 +00:00
### **Step-3**: search for sensitive credentials and endpoints
2021-02-01 09:24:10 +00:00
In this phase, you have to identify the **sensitive keywords** to analyze the **Javascript** code. A pattern that is popular with React Native applications, is the use of a third party services like such as Firebase, AWS s3 service endpoints, private keys etc.,
2021-11-30 16:46:07 +00:00
During my initial **recon process**, I have observed the application using the Dialogflow service. So based on this, I have searched a pattern related to its configuration. Fortunately, I was able to find **sensitive hard-coded credentials** in the Javascript code.
2021-02-01 09:24:10 +00:00
![Image for post](https://miro.medium.com/max/2086/1\*RAToFnqpp9ndM0lBeMlz6g.png)