This updated advisory is a follow-up to the updated advisory titled ICSA-15-344-01A Advantech EKI Vulnerabilities that was published December 15, 2015, on the NCCIC/ICS-CERT web site.
HD Moore of Rapid7 identified several vulnerabilities in Advantech’s EKI. Advantech has released updated firmware to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely. Exploits that target these vulnerabilities are known to be publicly available.
Advantech reports that the vulnerability affects the following products:
Exploitation of these vulnerabilities may allow an attacker to execute arbitrary code, to obtain private keys, or to impersonate the authenticated user and perform a man-in-the-middle attack.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Advantech is based in Taiwan and has distribution offices in 21 countries worldwide.
The EKI-1200 series Modbus gateways are bidirectional gateways for integrating Modbus/RTU and Modbus/ASCII serial devices to TCP/IP networked-based devices. These products are deployed in industrial automation globally.
GNU Bash Versions 1.14 through 4.3 contain a flaw that processes commands placed after function definitions in the added environment variable, allowing remote attackers to execute arbitrary code via a crafted environment, which enables network-based exploitation. This vulnerability is also known as “ShellShock.”b
CVE-2014-6271c has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).d
Advantech EKI uses the OpenSSL cryptographic library and transport layer security (TLS) implementation Version 1.0.1, which is known to be vulnerable to the Heartbleed vulnerability.f
CVE-2014-0160g has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).h
Stack-based buffer overflow in the get_packet method in socket.c in dhcpcd 3.2.3 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long packet.
CVE-2012-2152j has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).k
An attacker is able to bypass authentication to access the device.
CVE-2015-7938m has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).n
These vulnerabilities could be exploited remotely.
Exploits that target these vulnerabilities are publicly available.
An attacker with a low skill would be able to exploit these vulnerabilities.
Advantech has released a firmware update to mitigate these vulnerabilities in the EKI-132* product line on December 31, 2015. Users may download the latest firmware from the following location on Advantech’s web site:
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 web site (http://ics-cert.us-cert.gov/).
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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