ESB-2018.1532 - [Appliance] GE PACSystems products: Denial of service - Remote/unauthenticated 2018-05-18

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1532
        GE PACSystems CPE305/310, CPE330, CPE400, RSTi-EP CPE 100,
                            CPU320/CRU320, RXi
                                18 May 2018

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

Product:           GE PACSystems
                   GE RX3i
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8867  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-137-01

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Advisory (ICSA-18-137-01)

GE PACSystems CPE305/310, CPE330, CPE400, RSTi-EP CPE 100, CPU320/CRU320, RXi

Original release date: May 17, 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/.

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1. EXECUTIVE SUMMARY

  * CVSS v3 7.5
  * ATTENTION: Exploitable remotely/low skill level to exploit
  * Vendor: GE
  * Equipment: PACSystems CPE305/310, CPE330, CPE400, RSTi-EP CPE 100, CPU320/
    CRU320, RXi
  * Vulnerability: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause the device to reboot
and change its state, causing the device to become unavailable.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of PACSystems, an industrial Internet controller, are
affected:

  * PACSystems RX3i CPE305/310 version 9.20 and prior,
  * RX3i CPE330 version 9.21 and prior,
  * RX3i CPE 400 version 9.30 and prior,
  * PACSystems RSTi-EP CPE 100 all versions, and
  * PACSystems CPU320/CRU320 and RXi all versions.

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER INPUT VALIDATION CWE-20

The device does not properly validate input, which could allow a remote
attacker to send specially crafted packets causing the device to become
unavailable.

CVE-2018-8867 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H).

3.3 BACKGROUND

  * Critical Infrastructure Sectors: Critical Manufacturing
  * Countries/Areas Deployed: Worldwide
  * Company Headquarters Location: USA

3.4 RESEARCHER

Younes Dragoni of Nozomi Networks reported the vulnerability to NCCIC.

4. MITIGATIONS

GE has released the following firmware to mitigate the vulnerability (login
required):

IC695CPE305 ? https://digitalsupport.ge.com/communities/en_US/Download/
IC695CPE305-PACSystems-RX3i-CPU-DN ? Upgrade Kit:
CPE305_FW9_40_41G1733-MS10-000-A17.zip

IC695CPE310 ? https://digitalsupport.ge.com/communities/en_US/Download/
IC695CPE310-PACSystems-RX3i-CPU-DN ? Upgrade Kit:
CPE310_FW9_40_41G1734-MS10-000-A17.zip

IC695CPE330 ? https://digitalsupport.ge.com/communities/en_US/Download/
IC695CPE330-PACSystems-RX3i-CPU-DN ? Upgrade Kit:
CPE330_FW9_40_41G2016-FW01-000-A11.zip

IC695CPE400 ? https://digitalsupport.ge.com/communities/en_US/Download/
IC695CPE400-PACSystems-RX3i-Rackless-CPU-with-Field-Agent ? Upgrade Kit:
CPE400_FW9_40_41G2376-FW01-000-A3.zip

For CPE100 the newest firmware can be obtained through the following link:

https://digitalsupport.ge.com/communities/en_US/Download/
EPSCPE100-RSTi-EP-CPU-Firmware

GE reports that CPU/CRU320 is end of life, and there is a direct upgrade path
available to users.

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

  * Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
  * Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  * 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.

NCCIC also recommends that users take the following measures to protect
themselves from social engineering attacks:

  * Do not click web links or open unsolicited attachments in email messages.
  * Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  * Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

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?

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