Defiling Mac OS X - Ruxcon - Reverse Engineering Mac OS X - PUT ...

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EFI THE EXTENSIBLE FIRMWARE INTERFACE The EFI boot process Party over here ExitBootServices() ‣ Drivers register for callback ‣ Kernel is loaded ‣ But NOT executed yet ‣ We can feel it up Defiling Mac OS X - Ruxcon November, 2011
EFI THE EXPANSIVE FURNITURE INTERFERENCE What can we feel up ‣ We know the kernel is at 0xffffff8000200000 ‣ EFI uses a flat 32-bit memory model ‣ (no real/protected mode transition to deal with) ‣ In 32-bit mode its at 0x00200000 ‣ What do we do ‣ Inject shellcode ‣ Hook a syscall and point it at the shellcode ‣ Where can we put shellcode ‣ Empty memory at the end of the __TEXT segment (page alignment!) ‣ On the DEBUG kernel, almost a full 4k page (~3.5k) Defiling Mac OS X - Ruxcon November, 2011
Page 1 and 2: DEFILING MAC OS X: KERNEL ROOTKITS
Page 3 and 4: STUFF Things I will talk about ‣
Page 5 and 6: Defiling Mac OS X - Ruxcon November
Page 7 and 8: GETTING CODE INTO THE KERNEL Defili
Page 9 and 10: TECHNIQUES GETTING CODE INTO THE KE
Page 11 and 12: TECHNIQUES GETTING CODE INTO THE KE
Page 13 and 14: TECHNIQUES DODGY KERNEL SYMBOL RESO
Page 15 and 16: TECHNIQUES DODGY KERNEL SYMBOL RESO
Page 17 and 18: TECHNIQUES SYSCALL HOOKS Old faithf
Page 19 and 20: TECHNIQUES SYSCALL HOOKS static str
Page 21 and 22: TECHNIQUES TRUSTEDBSD HOOKS Trusted
Page 23 and 24: TECHNIQUES TRUSTEDBSD HOOKS kern_re
Page 25 and 26: TECHNIQUES NETWORKING HOOKS Registe
Page 27 and 28: ROOTKITTERY Defiling Mac OS X - Rux
Page 29 and 30: TECHNIQUES PROCESS PRIVESC void pro
Page 31 and 32: TECHNIQUES HIDING PROCESSES Might l
Page 33 and 34: TECHNIQUES HIDING FILES Hiding file
Page 35 and 36: ONE MORE THING... *cue turtleneck*
Page 37: EFI THE EXPLOSIVE FARMVILLE INVARIA
Page 41 and 42: REFERENCES Mac OS X Kernel Programm

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