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IOHIDFamily 0day

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A macOS kernel exploit based on an IOHIDFamily 0day.

Write-up here.


The prefetch timing attack I'm using for

for some reason doesn't work on High Sierra 10.13.2 anymore, and I don't feel like investigating that. Maybe patched, maybe just the consequence of a random change, I neither know nor care. The vuln is still there and my code does both info leak and kernel r/w, just not in the same binary - reason is explained in the write-up. If you want that feature, consider it an exercise for the reader.


The exploit consists of three parts:

  • poc
    panics the kernel to demonstrate the presence of a memory corruption, should work on all macOS versions.
  • leak
    leaks the kernel slide, could be adapted to other versions but as-is works only on High Sierra.
  • hid
    achieves full kernel r/w, tested only on Sierra and High Sierra (up to & including 10.13.1), might work on earlier versions too.

need to be run as the user that is currently logged in via the GUI, and they log you out in order to perform the exploit.
on the other hand, gives you four options for a first argument:
  • steal
    requires to be run as root and SIP to be disabled, but leaves you logged in the entire time.
  • kill
    requires root and forces a dirty logout by killing
  • logout
    if executed as root or the currently logged in user, logs you out via
    . Otherwise tries to log you out via AppleScript, and then falls back to
  • wait
    simply waits for a logout, shutdown or reboot to occur.

Additionally you can specify a second argument

. If given,
will permanently disable SIP and AMFI, and install a root shell in

should be run either via SSH or from a
session, if you wish to observe their output.


Should all be self-explanatory:

make all
make poc
make leak
make hid
make clean

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