Vulnerability Note VU#308556

GE Fanuc CIMPLICITY HMI heap buffer overflow

Overview

GE Fanuc CIMPLICITY HMI contains a remotely accessible heap buffer overflow vulnerability which may allow a remote attacker to execute arbitrary code.

I. Description

GE Fanuc CIMPLICITY HMI is software used for monitoring and control in Supervisory Control And Data Acquisition (SCADA) systems. A heap buffer overflow vulnerability exists in a CIMPLICITY process (w32rtr.exe) that listens on the network (32000/tcp). The vulnerable process exists in both servers and clients. An attacker could exploit this vulnerability by sending a specially crafted packet to a vulnerable CIMPLICITY system.

Note that this vulnerability affects GE Fanuc CIMPLICITY HMI versions up to and including version 7.0.

II. Impact

A remote, unauthenticated attacker may be able to execute arbitrary code or cause a denial of service.

III. Solution

Apply Patch

This vulnerability is addressed in CIMPLICITY 6.1 SP6 Hot fix - 010708_162517_6106 and CIMPLICITY 7.0 SIM 9. CIMPLICITY customers should refer to GE Fanuc knowledge base article KB2458 for more information.

Upgrade

Users of affected software with versions older than 6.1 are encouraged to upgrade to 6.1 or greater and then apply the patches described above. CIMPLICITY customers should refer to GE Fanuc knowledge base article KB12458 for more information.
Restrict Access

Restrict network access to hosts that require connections to CIMPLICITY. Do not allow access to CIMPLICITY from untrusted networks such as the internet.

Systems Affected

Vendor	Status	Date Updated
GE Fanuc	Vulnerable	24-Jan-2008

References

http://www.securityfocus.com/archive/1/487076/30/0/threaded
http://support.gefanuc.com/support/index?page=kbchannel&id=KB12458
http://www.gefanuc.com/as_en/gefanuc/resource_center/hmi_scada/hmiscada_security.html

Credit

This vulnerability was reported by Eyal Udassin of C4 Security.

This document was written by Chris Taschner.

Other Information

Date Public	01/24/2008
Date First Published	01/25/2008 03:30:28 PM
Date Last Updated	01/25/2008
CERT Advisory
CVE Name	CVE-2008-0176
US-CERT Technical Alerts
Metric	3.01
Document Revision	32

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Produced 2008 by US-CERT, a government organization
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