Vulnerability Note VU#506864

InduSoft NTWebServer web service stack-based buffer overflow

Overview

InduSoft NTWebServer web service contains a stack-based buffer overflow vulnerability.

I. Description

According to InduSoft's website: "InduSoft Web Studio™ is a powerful collection of automation tools that provide all the automation building blocks to develop HMIs, SCADA systems and embedded instrumentation solutions. Utilize InduSoft integrated Web technologies to take advantage of Internet/intranet connectivity." InduSoft NTWebServer runs a test web service on port 80/tcp. InduSoft NTWebServer test web service is vulnerable to a stack-based buffer overflow when more than 2048 bytes are written to the fixed-size stack buffer causing the test web service to write past the bounds of the buffer and corrupt the memory.

II. Impact

An attacker can cause the service to crash and may be able to execute arbitrary code.

III. Solution

Use IIS

InduSoft recommends using NTWebServer test web service only for development purposes and Microsoft IIS for production.

Restrict Access

Enable firewall rules to restrict access for port 80/tcp to only trusted sources.

Vendor Information

InduSoft's website lists other devices that may be using NTWebServer test web service that may also be vulnerable.

Vendor	Status	Date Notified	Date Updated
Advantech	Affected		2011-01-10
InduSoft	Affected		2011-01-12

References

http://www.us-cert.gov/control_systems/pdf/ICSA-10-337-01.pdf
http://www.indusoft.com/blog/?p=337
http://www.indusoft.com/mainpage.php?aricleid=17&type=Certified/Hardware

Credit

Thanks to Jeremy Brown for reporting this vulnerability to ICS-CERT.

This document was written by Michael Orlando.

Other Information

Date Public:	2011-01-04
Date First Published:	2011-01-12
Date Last Updated:	2011-01-12
CERT Advisory:
CVE-ID(s):
NVD-ID(s):
US-CERT Technical Alerts:
Severity Metric:	71.28
Document Revision:	27