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                             Luigi Auriemma

Application:  Siemens Tecnomatix FactoryLink
              http://www.usdata.com/sea/FactoryLink/en/p_nav1.html
              http://www.plm.automation.siemens.com/en_us/products/tecnomatix/production_management/factorylink/index.shtml
Versions:     <= 8.0.1.1473
Platforms:    Windows
Bug:          stack overflow
Exploitation: remote, versus server
Date:         21 Mar 2011 (found 02 Jan 2011)
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org


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


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


From vendor's website:
"Siemens FactoryLink monitors, supervises, and controls industrial
processes by enabling customers to perfect their processes and
products. Built on an advanced open architecture, FactoryLink delivers
the highest performance and flexibility to customers building vertical
applications in a wide range of industries.
Highly scaleable, FactoryLink can be used to build virtually any size
application, from the simplest Human-Machine Interface (HMI) systems to
the most complex and demanding Supervisory Control and Data Acquisition
(SCADA) systems."


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2) Bug
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CSService is a Windows service listening on port 7580.

The logging function is vulnerable to a buffer-overflow caused by the
usage of vsprintf with a stack buffer of 1024 bytes.
The vulnerability can be exploited from remote in various ways like the
passing of a big path or filter string in the file related operations
(opcodes 6, 8 and 10).


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


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

  factorylink_x 3 SERVER


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4) Fix
======


No fix.

UPDATE 25 Mar 2011:
version 802.82


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