Pre-auth remote commands execution in SAP MaxDB 7.6.03.07

[Luigi Auriemma <aluigi@xxxxxxxxxxxxx>]

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                             Luigi Auriemma

Application:  SAP MaxDB
              https://www.sdn.sap.com/irj/sdn/maxdb
              http://www.sap.com
Versions:     <= 7.6.03 build 007
Platforms:    Windows, Linux and Solaris
Bug:          pre-auth remote commands execution
Exploitation: remote
Date:         09 Jan 2008
Author:       Luigi Auriemma
              e-mail: aluigi@xxxxxxxxxxxxx
              web:    aluigi.org


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1) Introduction
2) Bug
3) The Code
4) Fix


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===============
1) Introduction
===============


SAP MaxDB is a commercial and widely known and used database.


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2) Bug
======


The MaxDB server executes "cons.exe DATABASE COMMAND" through system()
when some special commands are called by the user.
Some of these special commands are "show" and "exec_sdbinfo" and this
last one is just one of the small amount of commands which can be
executed by the unauthenticated users before logging in.

The usage of system() for executing the cons program allows an external
unauthenticated attacker to execute any command he wants on the target
SAP MaxDB server simply passing the "&&" or other patterns for the
execution of multiple commands in the shell.

So it's just enough to use the following SAP command to see the content
of C: on Windows (the bug is naturally exploitable on any other
platform supported by the server):

  exec_sdbinfo && echo dir c:\ | cmd.exe

Then the rest and all the other possibilities of exploiting this
vulnerability are in the fantasy of the attacker...


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===========
3) The Code
===========


http://aluigi.org/poc/sapone.zip


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4) Fix
======


No fix


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--- 
Luigi Auriemma
http://aluigi.org