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                             Luigi Auriemma

Application:  PcVue
              http://www.arcinfo.com/index.php?option=com_content&id=2&Itemid=151
Versions:     PcVue       <= 10.0
              SVUIGrd.ocx <= 1.5.1.0
              aipgctl.ocx <= 1.07.3702
Platforms:    Windows
Bugs:         A] code execution in SVUIGrd.ocx Save/LoadObject
              B] write4 in SVUIGrd.ocx GetExtendedColor
              C] possible files corruption/injection in SVUIGrd.ocx Save/LoadObject
              D] array overflow in aipgctl.ocx DeletePage
Exploitation: remote
Date:         27 Sep 2011
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org


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


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


From vendor's homepage:
"PcVue is a new generation of SCADA software. It is characterised by
modern ergonomics and by tools based on object technology to reduce and
optimise applications development."


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=======
2) Bugs
=======

------------------------------------------------
A] code execution in SVUIGrd.ocx Save/LoadObject
------------------------------------------------

The aStream number of SaveObject and LoadObject methods available in
SVUIGrd.ocx (2BBD45A5-28AE-11D1-ACAC-0800170967D9) is used directly as
function pointer:

  02695b9d 8b00            mov     eax,dword ptr [eax]  ; controlled
  02695b9f ff5004          call    dword ptr [eax+4]    ; execution


-----------------------------------------
B] write4 in SVUIGrd.ocx GetExtendedColor
-----------------------------------------

Through the GetExtendedColor method of SVUIGrd.ocx it's possible to
write a dword in an arbitrary memory location:

  02198e36 8902            mov     dword ptr [edx],eax  ; controlled


---------------------------------------------------------------------
C] possible files corruption/injection in SVUIGrd.ocx Save/LoadObject
---------------------------------------------------------------------

The SaveObject allow to specify the name of the file to save while
LoadObject the one to load.
I have not performed additional research so for the moment the only
thing I have seen is the possibility of corrupting the files in the
system via directory traversal attacks.
I suspect that it's probable the possibility of writing custom content
but it has not been proved or verified.


-------------------------------------------
D] array overflow in aipgctl.ocx DeletePage
-------------------------------------------

Array overflow in the DeletePage method of the ActiveX component
aipgctl.ocx (083B40D3-CCBA-11D2-AFE0-00C04F7993D6):

  10013852 8b0cb8          mov     ecx,dword ptr [eax+edi*4]
  10013855 85c9            test    ecx,ecx
  10013857 7407            je      aipgctl+0x13860 (10013860)
  10013859 8b11            mov     edx,dword ptr [ecx]
  1001385b 6a01            push    1
  1001385d ff5204          call    dword ptr [edx+4]    ; execution


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


http://aluigi.org/poc/pcvue_1.zip


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


No fix.


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