BroadWin WebAccess Client

vendor:

WebAccess Client

by:

Luigi Auriemma

7.5

CVSS

HIGH

Format String and Arbitrary Memory Corruption

134, 787

CWE

Product Name: WebAccess Client

Affected Version From: bwocxrun.ocx <= 1.0.0.10 (aka version 7.0)

Affected Version To: bwocxrun.ocx <= 1.0.0.10 (aka version 7.0)

Patch Exists: NO

Related CWE: N/A

CPE: a:broadwin:webaccess_client

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows

2011

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

Mitigation:

No fix.

Source

Exploit-DB raw data:

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: aluigi@autistici.org
              web:    aluigi.org


#######################################################################


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


#######################################################################

===============
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).


#######################################################################

=======
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().


#######################################################################

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


http://aluigi.org/poc/bwocxrun_1.zip
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/17772.zip (bwocxrun_1.zip)


#######################################################################

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


No fix.