Automated Solutions Modbus/TCP Master OPC server Modbus TCP header vulnerability

Overview

Automated Solutions OPC Server contains a heap corruption vulnerability in the Modbus/TCP Master OPC server.

Description

Automated Solutions Modbus/TCP Master OPC Server contains a heap corruption vulnerability. The server is vulnerable to an attacker writing an arbitrary number of double words or DWORDs onto the heap.

For additional information see ICSA-10-322-02A.

Exploit code for this vulnerability is publicly available.

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Impact

Successful exploitation would likely not allow arbitrary code execution; however, an exploit could possibly corrupt the OPC server memory and cause a denial of service.

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Solution

Upgrade

According to the Modbus/TCP OPC Server readme file, version 3.0.2 addresses this vulnerability.

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Restrict Access

Enable firewall rules to restrict access to only trusted sources.

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Vendor Information

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Automated Solutions Affected

Updated: January 26, 2011

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

• <http://automatedsolutions.com/demos/demoform.asp?code=17&gt;
• <http://automatedsolutions.com/pub/asmbtcpopc/readme.htm&gt;

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://automatedsolutions.com/pub/asmbtcpopc/readme.htm&gt;
• <http://www.us-cert.gov/control_systems/pdf/ICSA-10-322-02A.pdf&gt;

Acknowledgements

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

This document was written by Michael Orlando.

Other Information

CVE IDs:	CVE-2010-4709
Severity Metric:	1.02 Date Public: