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https://github.com/Impact-I/reFlutter
Flutter Reverse Engineering Framework
https://github.com/Impact-I/reFlutter
bugbounty mobile-security reverse-engineering ssl-pinning
Last synced: about 2 months ago
JSON representation
Flutter Reverse Engineering Framework
- Host: GitHub
- URL: https://github.com/Impact-I/reFlutter
- Owner: Impact-I
- License: gpl-3.0
- Created: 2022-04-13T14:50:18.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-10-29T12:37:42.000Z (about 2 months ago)
- Last Synced: 2024-10-29T15:01:54.400Z (about 2 months ago)
- Topics: bugbounty, mobile-security, reverse-engineering, ssl-pinning
- Language: Python
- Homepage:
- Size: 389 KB
- Stars: 1,766
- Watchers: 28
- Forks: 219
- Open Issues: 196
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
[](https://github.com/Impact-I/reFlutter/stargazers)
**Read more on the blog:** https://swarm.ptsecurity.com/fork-bomb-for-flutter/
This framework helps with Flutter apps reverse engineering using the patched version of the Flutter library which is already compiled and ready for app repacking. This library has snapshot deserialization process modified to allow you perform dynamic analysis in a convenient way.
Key features:
- `socket.cc` is patched for traffic monitoring and interception;
- `dart.cc` is modified to print classes, functions and some fields;
- display absolute code offset for functions
- contains minor changes for successfull compilation;
- if you would like to implement your own patches, manual Flutter code changes are supported using a specially crafted `Dockerfile`
### Supported engines
- Android: arm64, arm32;
- iOS: arm64;
- Release: Stable, Beta
### Install
```
# Linux, Windows, MacOS
pip3 install reflutter==0.8.0
```
### Usage
```console
impact@f:~$ reflutter main.apk
Please enter your Burp Suite IP:
SnapshotHash: 8ee4ef7a67df9845fba331734198a953
The resulting apk file: ./release.RE.apk
Please sign the apk file
Configure Burp Suite proxy server to listen on *:8083
Proxy Tab -> Options -> Proxy Listeners -> Edit -> Binding Tab
Then enable invisible proxying in Request Handling Tab
Support Invisible Proxying -> true
impact@f:~$ reflutter main.ipa
```
### Traffic interception
You need to specify the IP of your Burp Suite Proxy Server located in the same network where the device with the flutter application is. Next, you should configure the Proxy in `BurpSuite -> Listener Proxy -> Options tab`
- Add port: `8083`
- Bind to address: `All interfaces`
- Request handling: Support invisible proxying = `True`
You don't need to install any certificates. On an Android device, you don't need root access as well. reFlutter also allows to bypass some of the flutter certificate pinning implementations.
### Usage on Android
The resulting apk must be aligned and signed. I use [uber-apk-signer](https://github.com/patrickfav/uber-apk-signer/releases/tag/v1.2.1)
`java -jar uber-apk-signer.jar --allowResign -a release.RE.apk`.
To see which code is loaded through DartVM, you need to run the application on the device. Note that you must manually find what `_kDartIsolateSnapshotInstructions` (ex. 0xB000 ) equals to using a binary search. reFlutter writes the dump to the root folder of the application and sets `777` permissions to the file and folder. You can pull the file with adb command
```console
impact@f:~$ adb -d shell "cat /data/data//dump.dart" > dump.dart
```
file contents
```dart
Library:'package:anyapp/navigation/DeepLinkImpl.dart' Class: Navigation extends Object {
String* DeepUrl = anyapp://evil.com/ ;
Function 'Navigation.': constructor. (dynamic, dynamic, dynamic, dynamic) => NavigationInteractor {
Code Offset: _kDartIsolateSnapshotInstructions + 0x0000000000009270
}
Function 'initDeepLinkHandle':. (dynamic) => Future* {
Code Offset: _kDartIsolateSnapshotInstructions + 0x0000000000412fe8
}
Function '_navigateDeepLink@547106886':. (dynamic, dynamic, {dynamic navigator}) => void {
Code Offset: _kDartIsolateSnapshotInstructions + 0x0000000000002638
}
}
Library:'package:anyapp/auth/navigation/AuthAccount.dart' Class: AuthAccount extends Account {
PlainNotificationToken* _instance = sentinel;
Function 'getAuthToken':. (dynamic, dynamic, dynamic, dynamic) => Future* {
Code Offset: _kDartIsolateSnapshotInstructions + 0x00000000003ee548
}
Function 'checkEmail':. (dynamic, dynamic) => Future* {
Code Offset: _kDartIsolateSnapshotInstructions + 0x0000000000448a08
}
Function 'validateRestoreCode':. (dynamic, dynamic, dynamic) => Future* {
Code Offset: _kDartIsolateSnapshotInstructions + 0x0000000000412c34
}
Function 'sendSmsRestorePassword':. (dynamic, dynamic) => Future* {
Code Offset: _kDartIsolateSnapshotInstructions + 0x00000000003efb88
}
}
```
### Usage on iOS
Use the IPA file created after the execution of `reflutter main.ipa` command. To see which code is loaded through DartVM, you need to run the application on the device. reFlutter will print the dump file path to the Xcode console logs with the reFlutter tag
`Current working dir: /private/var/mobile/Containers/Data/Application//dump.dart`
Next, you will need to pull the file from the device
### Frida
The resulting offset from the dump can be used in the frida [script](https://github.com/Impact-I/reFlutter/blob/main/frida.js)
```
frida -U -f -l frida.js
```
To get value for `_kDartIsolateSnapshotInstructions` you can use `readelf -Ws libapp.so` Where is the value you need in the `Value` field
### To Do
- [x] Display absolute code offset for functions;
- [ ] Extract more strings and fields;
- [x] Add socket patch;
- [ ] Extend engine support to Debug using Fork and Github Actions;
- [ ] Improve detection of `App.framework` and `libapp.so` inside zip archive
### Build Engine
The engines are built using [reFlutter](https://github.com/Impact-I/reFlutter/blob/main/.github/workflows/main.yml) in [Github Actions](https://github.com/Impact-I/reFlutter/actions) to build the desired version, commits and snapshot hashes are used from this [table](https://github.com/Impact-I/reFlutter/blob/main/enginehash.csv).
The hash of the snapshot is extracted from `storage.googleapis.com/flutter_infra_release/flutter//android-arm64-release/linux-x64.zip`
release
[](https://github.com/Impact-I/reFlutter/actions)
### Custom Build
If you would like to implement your own patches, manual Flutter code change is supported using specially crafted [Docker](https://hub.docker.com/r/ptswarm/reflutter)
```bash
git clone https://github.com/Impact-I/reFlutter && cd reFlutter
docker build -t reflutter -f Dockerfile .
```
Build command:
```bash
docker run -it -v "$(pwd):/t" -e HASH_PATCH= -e COMMIT= reflutter
```
Example:
```bash
docker run -it -v "$(pwd):/t" -e HASH_PATCH=aa64af18e7d086041ac127cc4bc50c5e -e COMMIT=d44b5a94c976fbb65815374f61ab5392a220b084 reflutter
```
# Linux, Windows
EXAMPLE BUILD ANDROID ARM64:
```bash
docker run -e WAIT=300 -e x64=0 -e arm=0 -e HASH_PATCH= -e COMMIT= --rm -iv${PWD}:/t reflutter
```
FLAGS:
-e x64=0
-e arm64=0
-e arm=0
-e WAIT=300
-e HASH_PATCH=[Snapshot_Hash]
-e COMMIT=[Engine_commit]