the best way how to root your I9506:
Tested on GT-I9506 with JB 4.2.2 but it should running on the others ROMs. ROMs with KNOX is possible to root also but with some limitations (You have to lock KNOX apps).
Install this Attachment 2677489 by CWM to your phone (it contains only this SuperSU, no kernel, no issues)
Install CWM by ODIN:
Install zip file by CWM:
1. Store Attachment 2677489 file to phone memory
2. Restart phone to ClockWorkMod Recovery
3. In CWM recovery select "install zip".
4. Chose zip from /sdcard.
5. Find your storred file and install it by home button
6. Restart phone.
7. Update SuperSU by Google Play.