Generic exploit for master key vulnerability in Android
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Download and install Android SDK from https://developer.android.com/sdk/index.html
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Download Superuser from http://androidsu.com/superuser/ then place Superuser.apk and "su" binary for your architecture (usually ARM) in the checkout directory
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Run ./doit.sh and follow the instructions
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Enjoy your freedom and get rid of that annoying bloatware / spyware. May I suggest CyanogenMod (http://cyanogenmod.org/)?
Based on:
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research by Jay Freeman (saurik), available at http://www.saurik.com/id/17
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APK injection PoC by Pau Oliva, available at https://github.com/poliva/random-scripts/blob/master/android/masterkey-apk-inject.sh