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AUSCERT External Security Bulletin Redistribution
ESB-2019.3249
Advisory (icsa-19-239-01) Delta Controls enteliBUS Controllers
28 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: enteliBUS Controllers
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-9569
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-19-239-01
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ICS Advisory (ICSA-19-239-01)
Delta Controls enteliBUS Controllers
Original release date: August 27, 2019
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 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Delta Controls
o Equipment: enteliBUS Controllers
o Vulnerability: Buffer Overflow
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker on the
same network to gain complete control of the device's operating system and
allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Delta Controls enteliBUS Controllers, industrial
control systems, are affected:
o enteliBUS Manager firmware Versions 3.40 R5 build 571848 and prior
o enteliBUS Manager Touch (eBMGR-TCH) firmware Versions 3.40 R5 build 571848
and prior
o enteliBUS Controller (eBCON) firmware Versions 3.40 R5 build 571848 and
prior
3.2 VULNERABILITY OVERVIEW
3.2.1 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
The affected products are vulnerable to a buffer overflow condition due to the
lack of input validation, which may allow an attacker to remotely execute
arbitrary code.
CVE-2019-9569 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Government
Facilities
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Canada
3.4 RESEARCHER
Douglas McKee @fulmetalpackets and contributing researcher Mark Bereza
@ROPsicle of McAfee Advanced Threat Research reported this vulnerability to
Delta Controls.
4. MITIGATIONS
Delta Controls recommends users upgrade from enteliBUS 3.40 firmware to Version
3.40 R6 build 612850. Delta Controls also states it is important buildings are
updated to the 3.40 R6 release to mitigate risk. The firmware is only
accessible by Delta Controls registered partners and is not available for
public download. To acquire the firmware update, contact a Delta Controls
distributor or Delta Controls directly.
In addition to upgrading enteliBUS, Delta Controls recommends the following
actions to secure building sites:
o Do not leave building controllers exposed to the Internet.
If remote connections to the network are required, use a virtual
private network (VPN).
Secure networks using Tempered Networks products (available through
Delta Controls).
o Regularly review and validate the list of users authorized to access sites
and controllers.
o Ensure personnel with access to the system are knowledgeable about and are
trained to use Delta Controls products and networks.
o Follow security industry recommended practices for securing sites .
For more information on the vulnerability and more detailed mitigation
instructions, please see Delta Controls Security Bulletin "SecB0001: enteliBUS
3.40 Controllers Remote Code Execution Vulnerability." (Login required; only
accessible by Delta Controls registered partners and not available for public
download.)
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage onus-cert.gov . 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 webpage on us-cert.gov 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 CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
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