This updated advisory is a follow-up to the original advisory titled ICSA-19-057-01 Moxa IKS, EDS that was published February 26, 2019, on the ICS webpage on us-cert.gov.
Successful exploitation of these vulnerabilities could allow the reading of sensitive information, remote code execution, arbitrary configuration changes, authentication bypass, sensitive data capture, reboot of the device, device crash, or full compromise of the device.
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The following Moxa industrial switches are affected:
Please note that some of these models are not affected by all the vulnerabilities listed below. See Moxa’s security advisory for further details.
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Several buffer overflow vulnerabilities have been identified, which may allow remote code execution.
A cross-site request forgery has been identified, which may allow for the execution of unauthorized actions on the device.
The device fails to properly validate user input, giving unauthenticated and authenticated attackers the ability to perform XSS attacks, which may be used to send a malicious script.
The device does not properly check authority on server side, which results in a read-only user being able to perform arbitrary configuration changes.
The devices do not implement sufficient measures to prevent multiple failed authentication attempts, which may allow an attacker to discover passwords via brute force attack.
The devices use plaintext transmission of sensitive data, which may allow an attacker to capture sensitive data such as an administrative password.
Failure to properly check array bounds may allow an attacker to read device memory on arbitrary addresses, which may allow an attacker to retrieve sensitive data or cause device reboot.
The devices store plaintext passwords, which may allow sensitive information to be read by someone with access to the device.
The software generates a predictable cookie calculated with an MD5 hash, allowing an attacker to capture the administrator's password, which could lead to a full compromise of the device.
The devices allow remote authenticated users to cause a denial of service via a specially crafted packet, which may cause the switch to crash.
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Ivan B, Sergey Fedonin, Vyacheslav Moskvin, Ilya Karpov, Evgeny Druzhinin, and Georgy Zaytsev of Positive Technologies Security reported these vulnerabilities to CISA.
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Moxa recommends users implement the following measures to mitigate these vulnerabilities.
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Please see Moxa’s security advisory for more information.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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 on us-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.
CISA also recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
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://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
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