Portcullis Security Advisory


Vulnerable System:

Visionsoft Audit


Vulnerability Title:

The VSAOD server has input validation flaws which can result in an unauthenticated heap overflow.


Vulnerability discovery and development:

Portcullis Security Testing Services discovered this vulnerability during an application assessment. 
Further research was then carried out post assessment.


Credit for Discovery:

Tim Brown - Portcullis Computer Security Ltd.


Affected systems:

All known versions of Audit, the vulnerability was discovered for version 12.4.0.0.


Details:

It is possible to set the log file name on the remote VSAOD server using the following unauthenticated exchange:

client> LOG.<filename>
server> Logfile set to: <filename>

When the file name passed is of sufficient length, the remote VSAOD server will terminate.  As the server writes the file to its file prior to crashing, the server will terminate every time it is restarted until the ini file has been fixed.


Impact:

An attacker could cause a Denial of Service or execute arbitrary code.  Since the VSAOD server typically runs as SYSTEM, an attacker who successfully executes arbitrary code will fully compromise the system.


Exploit:

Exploit code is not required.

Vendor Status:

Contacted support@visionsoft.com


e-mailed - 16th January 2007
e-mailed - 26th February 2007
e-mailed - 15th March 2007


Copyright:

Copyright Portcullis Computer Security Limited 2006, All rights reserved worldwide.
Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited.


Disclaimer:

The information herein contained may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (Portcullis Computer Security Limited) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.