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AUSCERT External Security Bulletin Redistribution
ESB-2018.1829
Advisory (ICSA-18-172-01) Delta Electronics Delta Industrial
Automation COMMGR
22 June 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Delta Industrial Automation COMMGR
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-10594
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-172-01
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Advisory (ICSA-18-172-01) Delta Electronics Delta Industrial Automation COMMGR
Original release date: June 21, 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
CVSS v3 7.3
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Delta Electronics
Equipment: Delta Industrial Automation COMMGR
Vulnerability: Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow remote code execution,
cause the application to crash, or cause a denial-of-service condition in the
application server.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Delta Industrial Automation COMMGR, a communication
management software, and accompanying PLC simulators are affected:
COMMGR Version 1.08 and prior.
DVPSimulator EH2, EH3, ES2, SE, SS2
AHSIM_5x0, AHSIM_5x1
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
The application utilizes a fixed-length stack buffer where an unverified
length value can be read from the network packets via a specific network port,
causing the buffer to be overwritten. This may allow remote code execution,
cause the application to crash, or result in a denial-of-service condition in
the application server.
CVE-2018-10594 has been assigned to this vulnerability. A CVSS v3 base score
of 7.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
3.3 BACKGROUND
CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Communications,
Critical Manufacturing, Energy, Healthcare and Public Health
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
An anonymous researcher working with Trend Micros Zero Day Initiative reported
this vulnerability to NCCIC.
4. MITIGATIONS
Delta Electronics has released COMMGR v1.09 to address this vulnerability and
recommends users upgrade. The updated version can be downloaded at:
http://www.deltaww.com/Products/PluginWebUserControl/downloadCenterCounter.aspx?DID=2093&DocPath=1&hl=en-USl
Delta Electronics also recommends affected users apply application whitelists
to allow only trusted communications via Ports 502 and 10002.
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.
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.
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