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AUSCERT External Security Bulletin Redistribution
ESB-2018.1560
Advisory (ICSA-18-142-01) Martem TELEM-GW6/GWM
23 May 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Martem TELEM-GW6/GWM
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-10609 CVE-2018-10607 CVE-2018-10603
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-142-01
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Advisory (ICSA-18-142-01)
Martem TELEM-GW6/GWM
Original release date: May 22, 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 10.0
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Martem
Equipment: TELEM-GW6/GWM
Vulnerabilities: Missing Authentication for Critical Function, Resource
Exhaustion, Cross-Site Scripting
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow execution of
unauthorized industrial process control commands, denial of service, or
client-side code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following TELEM products with insecure configurations are affected:
GW6 Version 2018.04.18-linux_4-01-601cb47 and prior, and
GWM Version 2018.04.18-linux_4-01-601cb47 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
The RTU does not perform authentication of IEC-104 control commands, which may
allow a rogue node a remote control of the industrial process.
CVE-2018-10603 has been assigned to this vulnerability. A CVSS v3 base score
of 10.0 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L).
3.2.2 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400
Creating new connections to one or more IOAs, without closing them properly,
may cause a denial of service within the industrial process control channel.
CVE-2018-10607 has been assigned to this vulnerability. A CVSS v3 base score
of 8.2 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H).
3.2.3 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
Improper sanitization of data over a Websocket may allow cross-site scripting
and client-side code execution with target user privileges.
CVE-2018-10609 has been assigned to this vulnerability. A CVSS v3 base score
of 7.4 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N).
3.3 BACKGROUND
Critical Infrastructure Sectors: Energy
Countries/Areas Deployed: Estonia, Latvia, Lithuania, and Finland
Company Headquarters Location: Estonia
3.4 RESEARCHER
Bernhards Blumbergs and Arturs Danilevics of CERT.LV, Latvia, reported these
vulnerabilities to NCCIC.
4. MITIGATIONS
Martem has provided updated information within the Security Considerations
section of their Configuration Manual which can be accessed at following link:
http://phobos.martem.ee/shr/dsum/Telem-GWS_usermanual.pdf
Martem recommends the following mitigations for CVE-2018-10603 and
CVE-2018-10607:
In most cases, these vulnerabilities can be resolved by proper configuration:
Using "other side IP" field in RTU configuration for every TCP/IP channel.
This will minimize the risk of allowing unauthorized access and control over
the communication channels (i.e., only trusted partners are allowed);
Using secure VPN channels;
Proper packet filtering by enabling firewall in RTU configuration. Note
that the "interface" field of every communication channel must be properly set
in RTU configuration when firewall is enabled.
Martem recommends the following mitigations for CVE-2018-10609:
Upgrade to firmware 2.0.73 or higher. Fixed firmware will be available
after 23.05.2018. Contact Martem for more information;
WebServer should be turned on according to need of the configurator. If
the WebServer is not needed anymore, then it should be removed from the
configuration;
WebServer access should be protected by strong password to avoid
unauthorized access. Other side IP should be defined in configuration. Use
firewall to avoid untrusted connections and to restrict the number of parallel
connections to the WebServer.
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.
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 these vulnerabilities.
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