ESB-2018.2976 - [Win] GE Communicator: Execute arbitrary code/commands - Remote with user interaction 2018-10-11

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2976
                 Advisory (ICSA-18-275-02) GE Communicator
                              11 October 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           GE Communicator
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-7908  

Reference:         ESB-2017.1753

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-275-02

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Advisory (ICSA-18-275-02)

GE Communicator

Original release date: October 02, 2018

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided "as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/.

1. EXECUTIVE SUMMARY

  o CVSS v3 7.6
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: GE
  o Equipment: Communicator
  o Vulnerability: Heap-based Buffer Overflow

2. RISK EVALUATION

Exploitation could allow attackers to execute arbitrary code or create a
denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Communicator, an application for programming and
monitoring supported metering devices, are affected:

  o Third party product Gigasoft, v5 and prior included in Communicator 3.15
    and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1    HEAP-BASED BUFFER OVERFLOW CWE-122

A malicious HTML file that loads the ActiveX controls trigger the vulnerability
via unchecked function calls.

CVE-2017-7908 has been assigned to this vulnerability. A CVSS v3 base score of
7.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L
/I:L/A:H).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy
  o COUNTRIES/AREAS DEPLOYED:  Worldwide
  o COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Kimiya, working with iDefense Labs (now part of Accenture Security), reported
this vulnerability to NCCIC.

4. MITIGATIONS

GE recommends users update to Version 4.0 or the latest available release, to
mitigate this vulnerability. This update can be obtained from the following
location:

https://www.gegridsolutions.com/app/ViewFiles.aspx?prod=epm6000&type=7

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o When remote access is required, use secure methods, such as Virtual Private
    Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
    be updated to the most current version available. Also recognize that VPN
    is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly available
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.

No known public exploits specifically target this vulnerability.

Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://
ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

The NCCIC continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this product.

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