Root Transmission: the ONLY app that allows you to root other phones straight from your own device!
Inspired by Kos's p2p-adb hacking toolkit (Hak5 1205 - Extreme Android and Google Auth Hacking with KosTechnolust since 2005), this app is a pleasant, easy way to root other phones while away from your computer! Just two buttons, Root and Unroot! Connect the cable and root away! It couldn't be simpler!
Even has its own terminal window so you can see exactly what's going on while your phone does its thing!
You will need a ROOTED device capable of USB hosting (USB On The Go), a USB OTG cable and one-click root scripts for the devices you wish to root.
Scripts and their associated files should be placed in /sdcard/RootTransmission/*devicename*/*version*/, otherwise it will not be available for use. *devicename* and *version* can be whatever you want.
Note that this is an UNSTABLE version, and you use this app at your own risk. Occasional force closes are to be expected (though they will most likely not break the phone you are trying to root). Incorrectly written scripts can permanently damage or brick both devices involved, so only use trusted 3rd party root scripts and at your own risk.
Mais informação aqui: [APP][4.0+] Root Transmission - Root other devices using your phone! - xda-developers