bugtraq - NSOADV-2010-003: DATEV ActiveX Control remote command execution

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Message-ID: <4B86326A.3050502@sotiriu.de>
Date: Thu, 25 Feb 2010 09:18:50 +0100
From: NSO Research <nso-research@...iriu.de>
To: bugtraq@...urityfocus.com
Subject: NSOADV-2010-003: DATEV ActiveX Control remote command execution

______________________________________________________________________

NSOADV-2010-003: DATEV ActiveX Control remote command execution
______________________________________________________________________
______________________________________________________________________

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                        11111 00110 00110001111
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                11111  0 11 01 0 11 1 1  111011001
             11111111101 1 11 0110111  1    1111101111
           1001  0 1 10 11 0 10 11 1111111  1 111 111001
         111111111 0 10 1111 0 11 11 111111111 1 1101 10
        00111 0 0 11 00 0 1110 1 1011111111111 1111111 11  100
       10111111 0 01 0  1 1 111110 11 1111111111111  11110000011
       0111111110 0110 1110 1 0 11101111111111111011 11100  00
       01111 0 10 1110 1 011111 1 111111111111111111111101 01
       01110 0 10 111110 110 0 11101111111111111111101111101
      111111 11 0 1111 0 1 1 1 1 111111111111111111111101 111
      111110110 10 0111110 1 0 0 1111111111111111111111111 110
    111 11111 1  1 111 1   10011 101111111111011111111 0   1100
   111 10  110 101011110010   11111111111111111111111 11 0011100
   11 10     001100     0001      111111111111111111 10 11 11110
  11110       00100      00001     10 1  1111  101010001 11111111
  11101        0  1011     10000    00100 11100        00001101 0
  0110         111011011             0110   10001        101 11110
  1011                 1             10 101   000001        01   00
   1010 1                              11001      1 1        101  10
      110101011                          0 101                 11110
            110000011
                      111
______________________________________________________________________
______________________________________________________________________

  Title:                  DATEV DVBSExeCall ActiveX Control remote
                          command execution
  Severity:               Critical
  Advisory ID:            NSOADV-2010-003
  CVE Number:             CVE-2010-0689
  Found Date:             11.01.2010
  Date Reported:          28.01.2010
  Release Date:           25.02.2010
  Author:                 Nikolas Sotiriu
  Mail:                   nso-research at sotiriu.de
  Website:                http://sotiriu.de/
  Twitter:                http://twitter.com/nsoresearch
  Advisory-URL:           http://sotiriu.de/adv/NSOADV-2010-003.txt
  Vendor:                 DATEV (http://www.datev.de/)
  Affected Products:      DATEV Base System (Grundpaket Basis)
  Affected Component:     DVBSExeCall Control ActiveX Control V.1.0.0.1
  Remote Exploitable:     Yes
  Local Exploitable:      No
  Patch Status:           Vendor released a patch (See Solution)
  Discovered by:          Nikolas Sotiriu
  Disclosure Policy:      http://sotiriu.de/policy.html
  Thanks to:              Thierry Zoller: For the permission to use his
                                          Policy



Background:
===========

DATEV eG is a German Company, which makes Software for tax advisors and
lawyers.

The affected Base System has to be installed on all systems that
need DATEV Software.



Description:
============

During the installation of the DATEV Base System (Grundpaket Basis) an
ActiveX Control will be installed (DVBSExeCall.ocx), in which the
function "ExecuteExe" is vulnerable to a command execution bug.


Name:             ActiveX-Control zum Öffnen von LEXinform und der InfoDB
Vendor:           DATEV eG
Type:             ActiveX-Steuerelement
Version:          1.0.0.1
GUID:             {C1CF8B56-3147-41A2-B9BF-79437EED7AFC}
File:             DVBSExeCall.ocx
Folder:           C:\DATEV\PROGRAMM\HLPDVBS\
Safe for Script:  True
Safe for Init:    True
IObjectSafety:    False


NOTE: The affected ActiveX Control will be installed by any DATEV
      Software, so each system with a DATEV installation is vulnerable.



Proof of Concept :
==================

Weaponized PoC demonstration video:
+----------------------------------
http://sotiriu.de/demos/videos/nso-2010-003.html



Solution:
=========

DATEV Advisory
+-------------
http://www.datev.de/info-db/1080162 (German)

Service-Release Paket V. 1.0
+---------------------------
http://www.datev.de/portal/ShowPage.do?pid=dpi&nid=96550



Disclosure Timeline (YYYY/MM/DD):
=================================

2010.01.11: Vulnerability found
2010.01.25: Initial contact per Online forms
2010.01.26: Initial vendor response
2010.01.26: Ask for a PGP Key and send the Disclosure Policy to vendor.
            [-] No Response
2010.01.28: Ask if vendor received my last email.
2010.01.28: Vendor is unable to use PGP.
2010.01.28: Sent PoC, Advisory, Disclosure policy and planned disclosure
            date (2010.02.11) to Vendor
2010.01.29: Vendor acknowledges the reception of the advisory and start
            to develop a patch.
2010.02.02: Patch is finished. Vendor wishes to delay the release to the
            2010.02.25.
2010.02.02: Changed release date to 2010.02.25.
2010.02.03: Patch is published
2010.02.25: Release of this Advisory