- What is SSL?
Secure Socket Layer (SSL) and Transport Layer Security (TLS) ensure encrypted
Communication over the internet – specified as HTTPS. The security factors of SSL are based on the security certificates’ “Chain of Trust.” When a sender sent a message, the client checks the Server’s SSL certificate to confirm whether the certificate is issued by Trusted CA.
What Is Certificate Pinning?
Certificate pinning forces your client app to validate the server’s certificate against a known copy. After pinning your server’s certificate inside your client app, your client should check the basic validity of the cert from the list above, as well as verify that the server’s certificate matches the pinned certificate.
SSL pinning bypass?
SSL pinning bypass is a major step that needs to be done when we even start the dynamic analysis of HTTP requests for most of the mobile application nowadays as organizations are more concern about data privacy and secure transfer of data over the network from threads like Man-in-The-Middle (MiTM) attacks.
What is FRIDA?
Frida is a framework that injects scripts to native apps to manipulate application’s logic in runtime which is a more dynamic approach for pentesting mobile applications.
I’m using genymotion for this one. Genymotion is easy to set-up and use and can download it from below.
Python frida packages and adb installation:
python -m pip install Frida
python -m pip install objection
python -m pip install frida-tools
pip install Frida
pip install objection
pip install frida-tools
apt install adb
- Setup and installation
- Connect device to adb:
If you do not enable- first goto settings >> Developer options and enable debugging mode in device so that adb can communicate with the device.
- Install SSl pinning apk in device
Step:1 Download apk – go to directory open terminal
adb install -r twitter_9.69.0_androidapksbox.apk
Step:2 Twitter installed in emulator
Step:3 Open the application and Observe that the application is a SSL Pinning
- Frida Server Setup:
Download latest frida server:
Step:1 URL https://github.com/frida/frida/releases
Step:2 Now we need to push our frida-server file into the device. Extract and Copy “frida-server-12.4.7-android-x86” file in adb folder rename file as “frida-server”
Step:3 following command → adb push frida-server /data/local/tmp/
Step:4 Pushed this /data/local/tmp
Step:5 Give permissions to frida-server → adb shell chmod 777 /data/local/tmp/frida-server
Step:6 Push the certificate into the device and into the same location as the frida-server, name it cert-der.crt
Step:7 Pushed this /data/local/tmp
Step:8 URL https://codeshare.frida.re/@pcipolloni/universal-android-ssl-pinning-bypass-with-frida/ , You can save this code as fridascript.js in the same folder as adb → adb push fridascript.js /data/local/tmp/
Step:9 Pushed this /data/local/tmp
Step:10 Check and run frida server in device → adb shell /data/local/tmp/frida-server &
Step:11 Following command → frida-ps -Uai
Step:12 Find your application’s package name
Step:13 Following command → frida -U -f com.twitter.android -l fridascript.js –no-paus
Step:14 Your command to inject the fridascript.js script into the native application
Step:15 BOOM Bypassed!!. We are intercepting traffic into BurpSuite
- Connect device to adb:
That’s all for this blog, I hope you enjoyed reading this. In future I will right one more blog that will include some other techniques.