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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 by an integer overflow vulnerability during the
handling of the opcode 0x26ac 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:
    32      malloc(x * 4)

Vulnerable code:
  00445AC7  |.  E8 A416FDFF   CALL 00417170                 ; get 32bit
  00445ACC  |.  8B03          MOV EAX,DWORD PTR DS:[EBX]
  00445ACE  |.  85C0          TEST EAX,EAX
  00445AD0  |.^ 76 BE         JBE SHORT 00445A90
  00445AD2  |.  8D1485 000000>LEA EDX,DWORD PTR DS:[EAX*4]  ; * 4
  00445AD9  |.  52            PUSH EDX
  00445ADA  |.  E8 D9160600   CALL <JMP.&MFC71U.#265>       ; malloc


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


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

  genesis_iof 12 SERVER


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


No fix.

UPDATE 08 Apr 2011:
GenBroker.exe 9.22.202.11


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