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securityvulnsSecurityvulnsSECURITYVULNS:DOC:26969
HistorySep 05, 2011 - 12:00 a.m.

Vulnerabilities in BroadWin WebAccess Client 1.0.0.10

2011-09-0500:00:00
vulners.com
8

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                         Luigi Auriemma

Application: BroadWin WebAccess Client
http://broadwin.com/Client.htm
Versions: bwocxrun.ocx <= 1.0.0.10 (aka version 7.0)
Platforms: Windows
Bugs: A] format string
B] arbitrary memory corruption
Exploitation: remote
Date: 02 Sep 2011
Author: Luigi Auriemma
e-mail: [email protected]
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 website:
"WebAccess is the first fully web browser-based software package for
human-machine interfaces (HMI), and supervisory control and data
acquisition (SCADA)."

The various operations are handled by the bwocxrun.ocx ActiveX
component which is available (but it's not updated) also in Advantech
WebAccess (http://webaccess.advantech.com).

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2) Bugs


A] format string

The OcxSpool function is affected by a format string vulnerability
caused by the usage of the Msg string provided by the attacker directly
with vsprintf() without the required format argument.


B] arbitrary memory corruption

WriteTextData and CloseFile allow to corrupt arbitrary zones of the
memory through a fully controllable stream identifier in fclose() and
fwrite().

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3) The Code

http://aluigi.org/poc/bwocxrun_1.zip

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4) Fix

No fix.

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Luigi Auriemma
http://aluigi.org