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                             Luigi Auriemma

Application:  Iconics GENESIS32 and GENESIS64
              http://www.iconics.com/Home/Products/HMI-and-SCADA/GENESIS32.aspx
              http://www.iconics.com/Home/Products/HMI-and-SCADA/GENESIS64.aspx
Versions:     GENESIS32 <= 9.21
              GENESIS64 <= 10.51
              GenBroker.exe and GenBroker64.exe are the same version on
              both the softwares: 9.21.201.01
Platforms:    Windows
Bug:          integer overflow
Exploitation: remote, versus server
Date:         21 Mar 2011 (found 08 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
===============


Iconics Genesis is a SCADA HMI solution used worldwide with customers
that go from Beijing Traffic Control Center to the Pentagon and even
Poste Italiane ("Case Studies" source).

Informations from the vendor's website:
"GENESIS32™ is the industry’s first and only fully scalable suite of
OPC, SNMP, BACnet and Web-enabled HMI and SCADA applications."


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======
2) Bug
======


GenBroker is a Windows service running on port 38080.

The addresses and code snippets reported here are referred to GENESIS32
9.2.

The service is affected an integer overflow vulnerability during the
handling of the opcode 0x1C84 caused by the allocation of the memory
needed for the creation of an array trusting the number of elements
passed by the client.

The resulting memory corruptions (like direct registry calls, memory
locations calls, writing of data in arbitrary locations and so on)
allow code execution.

Fields in the packet:
    string
    string
    32
    32      malloc(x * 16)

Vulnerable code:
  0044CBE2  |.  E8 89A5FCFF   CALL 00417170                 ; get 32bit
  0044CBE7  |.  8B03          MOV EAX,DWORD PTR DS:[EBX]
  0044CBE9  |.  3BC5          CMP EAX,EBP
  0044CBEB  |.  76 3C         JBE SHORT 0044CC29
  0044CBED  |.  C1E0 04       SHL EAX,4                     ; * 16
  0044CBF0  |.  50            PUSH EAX
  0044CBF1  |.  E8 C2A50500   CALL <JMP.&MFC71U.#265>       ; malloc


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


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

  genesis_iof 11 SERVER


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======
4) Fix
======


No fix.

UPDATE 08 Apr 2011:
GenBroker.exe 9.22.202.11


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