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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-18-107-02) - Schneider Electric Triconex Tricon
18 April 2018
AusCERT Security Bulletin Summary
Product: Schneider Electric Triconex Tricon
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-8872 CVE-2018-7522
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Schneider Electric Triconex Tricon
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1. EXECUTIVE SUMMARY
CVSS v3 10.0
ATTENTION: Exploitable remotely/low skill level to exploit/HatMan malware
specifically targets these vulnerabilities.
Vendor: Schneider Electric
Equipment: Triconex Tricon, model 3008
Vulnerabilities: Improper Restriction of Operations within the Bounds of a
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could misinform or control the
Safety Instrumented System which could result in arbitrary code execution,
system shutdown, or the compromise of safety systems.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Triconex Tricon, a Safety Instrumented System, are
MP model 3008 firmware versions 10.0-10.4
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
The system call reads directly from memory addresses within the control program
area without any verification. Manipulating this data could allow attacker
data to be copied anywhere within memory.
CVE-2018-8872 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been assigned; the CVSS vector string is
3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
When a system call is made, registers are stored to a fixed memory location.
Modifying the data in this location could allow attackers to gain
supervisor-level access and control system states.
CVE-2018-7522 has been assigned to this vulnerability. A CVSS v3 base score of
7.9 has been assigned; the CVSS vector string is
- Critical Infrastructure Sectors: Multiple Sectors
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: France
This vulnerability was discovered by NCCIC and Schneider Electric during the
investigation of the HatMan malware.
Schneider Electric recommends that customers upgrade their firmware to the
latest 11.x version. Contact Schneider Electric support for instructions.
The HatMan malware requires unrestricted access to the safety network via
remote network or physical access. Additionally, the malware requires the
Tricon key switch to be in the "PROGRAM" mode to successfully deploy its
Schneider Electric continues to recommend users always implement the
instructions in the "Security Considerations" section in the standard Triconex
documentation (i.e., Planning and Installation Guides and TriStation 1131
Developers Guide), which include the following:
- Ensure the cybersecurity features in Triconex solutions are always
- Safety systems must always be deployed on isolated networks.
- Physical controls should be in place so that no unauthorized person would
have access to the safety controllers, peripheral safety equipment, or
the safety network.
- All controllers should reside in locked cabinets and never be left in the
- All TriStation engineering workstations should be secured and never be
connected to any network other than the safety network.
- All methods of mobile data exchange with the isolated safety network such
as CDs, USB drives, DVD's, etc. should be scanned before use in the
TriStation engineering workstations or any node connected to this
- Laptops and PCs should always be properly verified to be virus and
malware free before connecting to the safety network or any Triconex
- Operator stations should be configured to display an alarm whenever the
Tricon key switch is in the "PROGRAM" mode.
NCCIC recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
- Minimize network exposure for all Safety Instrumented Systems, and ensure
that they are not accessible from the Internet.
- Locate Safety Instrumented Systems behind firewalls, and isolate them
from all other networks.
- 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 ICS-CERT 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.
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.
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:
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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