FBUnpinner

SUPPORTS:
TLS1.3 & TLS1.2 for x86
TLS1.2 for ARM
TODO: ARM TLS1.3 support

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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)

How-to

[REQUIRES ROOT]

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

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")

<path_to_jdk>/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: Nexus_6_API_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/