FBUnpinner

Works for Instagram & Facebook

SUPPORTS:
TLS1.3 & TLS1.2 for x86/ARM32/ARM64
Instagram x86 currently does not work, feel free to open a pull request :)

A script to automate removing certificate pinning defense from Facebook applications.

TESTED FOR THE FOLLOWING APPS: - com.facebook.katana (Facebook for Android) - com.facebook.orca (Messenger) - com.facebook.lasso (Lasso) - com.instagram.android (Instagram for Android)

How-to

[REQUIRES ROOT]

• Note: for Instagram replace lib-xzs/libcoldstart.so with lib-zstd/libliger.so

1. Make sure you have run the desired Facebook application atleast once - what happens is that the cert pinning library (libcoldstart.so) is unpacked from an archive embedded in the APK.

2. Get root shell in your device:

   $(comp): adb shell
   $(phone): su
   

3. Pull libcoldstart.so from your desired Facebook application: ```

   (phone): cp /data/data/com.facebook.katana/lib-xzs/libcoldstart.so /sdcard/libcoldstart.so

   (phone): exit

   $(phone): exit $(comp): adb pull /sdcard/libcoldstart.so FBUnpinner/ ```

4. Patch the file:

   $ python3 patch.py
   

   OR:

   $ python3 patch.py libliger.so libliger-patched.so
   

5. Replace libcoldstart.so in the phone with the patched version: ``` $(comp): adb push libcoldstart-patched.so /sdcard/libcoldstart.so $(comp): adb shell $(phone): su

   (phone): cp /sdcard/libcoldstart.so /data/data/com.facebook.katana/lib-xzs/libcoldstart.so

   (phone): chmod 777 /data/data/com.facebook.katana/lib-xzs/libcoldstart.so

6. (Optional) Setting up Burp to work with TLS 1.3 ("no cipher suites in common")

   /jdk-11.0.2.jdk/Contents/Home/bin/java -jar burpsuite_community.jar
   

TODO

A script to just patch an APK

Tested Emulators

Android Studio: Nexus6API_24 - Google APIs Intel Atom (x86)

Genymotion: Google Nexus 5X API 26 (x86)

Reference

https://serializethoughts.com/2016/08/18/bypassing-ssl-pinning-in-android-applications/
https://plainsec.org/how-to-bypass-instagram-ssl-pinning-on-android-v78/