May 13, 2024
Prerequisites
- Burp suite
- Android SDK platform-tools (adb)
Step 1 – Setting up Burp Suite 1. In Burp Suite, go to the Proxy tab 2. Click on Proxy Settings 3. Here, we will choose to listen to port 8080 from all interfaces: 4. Click import/export CA certificate > Export > Certificate in DER format 5. Choose a path and name it anything with a .der extension 6. Click Next
Note We will use the name Burp_cert.der as an example for this tutorial.
Step 2 – Upload and install the Burp Suite Certificate as user certificate as system (root) certificate
1. Start your device. 2. Drag’n drop the Burp_cert.der file you generated to the device display. 3. Go to Android Settings and install a certificate. In the results, click Install certificates from SD Card and select CA certificate. Click install anyway to bypass the warning. 4. Navigate to /sdcard/Download and click on Burp_cert.der. 5. If you are using Android 9 or below, you may be requested to set a secure lock screen. Comply and set a lock:
Warning This method alters the Android system significantly and may break the device. Use with extreme care and only if necessary!
Android 14+ Android 12-13 Android 11 and below Important Installing System certificates on Android 14+ requires Magisk 23.0 and a third party plugin.
1. Root the device Android 14 and above images are not rooted by default, so make sure that the device is rooted before going any further. Please refer to Genymotion Device Image on-line documentation for more details. 2. Install Magisk Follow the instructions from our FAQ to install Magisk: How to install Magisk on Genymotion? 3. Install the certificate as user certificate Follow the instructions from the tab “as user certificate” 4. Install the Cert-Fix plugin for Magisk Download Cert-Fixer.zip from Cert-Fixer github repository. Upload the file to the device. You can either use adb push Cert-Fixer.zip /sdcard/Download or simply drag’n drop the file to the device display. Open Magisk and go to the Plugins section. Click “Install from storage” and select Cert-Fixed.zip from the Download folder (/sdcard/Download) Wait for the plugin to install. When done, click “Reboot” to reboot the device. After a reboot, the Burp Suite CA certificate (“PortSwigger CA”) should now be installed as a system certificate:
Warning The Cert-Fix plugin will copy any user certificate as system certificate on boot. If you don’t need to install any other system certificates, make sure to disable the plugin to avoid installing system certificates by mistake.
1. Root the device Android 12-13 images are not rooted by default, so make sure that the device is rooted before going any further. Please refer to Genymotion Device Image on-line documentation for more details. 2. Convert the certificate We need to convert the Burp certificate into PEM format. Use openssl to convert DER to PEM, then output the subject_hash_old: Bash openssl x509 -inform DER -in Burp_cert.der -out Burp_cert.pem # Convert DER certificate to PEM openssl x509 -inform PEM -subject_hash_old -in Burp_cert.pem |head -1 # Display subject_hash_old 3. Rename the file Then, rename the file with the output hash from the last command. For example, if the hash is 9a5ba575, then rename the file as 9a5ba575.0: Bash mv Burp_cert.pem 9a5ba575.0 4. Install the certificate You will need ADB to proceed. Please refer to Genymotion Device on-line documentation for more information. We need to make the /system partition writeable and push the certificate to the /system/etc/security/cacerts folder: Bash adb root # switch to root adb shell 'mount -o rw,remount /' # remount the system with write permission adb push <cert>.0 /system/etc/security/cacerts/ # upload the certificate adb shell chmod 644 /system/etc/security/cacerts/<cert>.0 # Change the certificate permissions For example, with the 9a5ba575.0 certificate: Bash adb root adb shell 'mount -o rw,remount /' adb push 9a5ba575.0 /system/etc/security/cacerts/ adb shell chmod 644 /system/etc/security/cacerts/9a5ba575.0
Reboot the device. After the device has rebooted, browsing to Settings -> Security -> Trusted Credentials should show the new “Portswigger CA” as a system trusted CA:
Step 3 – Set Android global proxy to Burp Suite proxy Important If the global proxy is still set after rebooting ot stopping the instance, Internet (Wifi) will be unavailable the next time a device is started from this recipe. To avoid this, make sure to unset the global proxy before. See “Disable global proxy” section.
If you haven’t already done it, connect the instance to ADB. Next, use ADB to set port 3333 but you can use any other port as long as it is available: Bash adb shell settings put global http_proxy localhost:3333 adb shell settings put global http_proxy localhost:3333
Finally, bind Burp proxy to the device proxy configuration with adb reverse. We setup Burp suite to use port 8080, so we will bind the device pxoxy to this port: Bash adb reverse tcp:3333 tcp:8080
From there, your instance network should be intercepted by Burp suite.
Disable global proxy Before stopping or rebooting the instance, make sure to disable the global proxy or the Internet connection may be unavailable the next time you start it: Bash adb shell settings put global http_proxy :0
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