ESB-2018.0580 - [Appliance] Emerson ControlWave Micro Process Automation Controller: Denial of service - Remote/unauthenticated 2018-02-28

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0580
       Advisory (ICSA-18-058-03): Emerson ControlWave Micro Process
                           Automation Controller
                             28 February 2018

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

Product:           Emerson ControlWave Micro Process Automation Controller
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5452  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-058-03

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Advisory (ICSA-18-058-03)
Emerson ControlWave Micro Process Automation Controller
Original release date: February 27, 2018

Legal Notice

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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/.

CVSS v3 7.5

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Emerson Process Management LLLP

Equipment: ControlWave Micro Process Automation Controller

Vulnerability: Stack-based Buffer Overflow

AFFECTED PRODUCTS

The following versions of ControlWave Micro firmware, a family of SCADA
RTUs, PLCs, PACs, and flow computers, are affected:

ControlWave Micro [ProConOS v.4.01.280] - firmware: CWM v.05.78.00
and prior.

IMPACT

Exploitation may possibly cause a halt of Ethernet functionality, requiring
a cold start to restore the system as well as communications related to
ControlWave Designer access. This can possibly result in a loss of system
availability and disruption in communications with other connected devices.

MITIGATION

Emerson offers the following mitigation advice:

Assess which ControlWave products in your organization have Ethernet
connectivity.
Upgrade the affected devices to firmware version 05.79.00 to correct this
possible action. System firmware upgrade instructions are available in
product documentation (ControlWave Micro Process Automation Controller
Instruction Manual, part D301392X012).
The resolution described is available only to the user when appropriately
incorporated into the application running in ControlWave Micro firmware.
Prior to upgrading the system firmware, always perform a full alarm and
historical collection (archive files as well as audit logs).

The release notes and firmware upgrade are available to registered users
at the following link:

http://www3.emersonprocess.com/remote/support/v2/login.html (link is
external).

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

Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet (link is external).
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 in the NCCIC Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT website.

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.

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW CWE-121

A stack-based buffer overflow vulnerability caused by sending crafted
packets on Port 20547 could force the PLC to change its state into halt mode.

CVE-2018-5452 has been assigned to this vulnerability. A CVSS v3
base score of 7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

RESEARCHER

Younes Dragoni of Nozomi Networks reported this vulnerability to NCCIC.

BACKGROUND

Critical Infrastructure Sectors: Energy, Water and Wastewater Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Minnesota, USA

Contact Information

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

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov (link sends e-mail)
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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