ATTENTION: Remotely exploitable/low skill level to exploit.
Equipment: Multilin SR Protective Relays
Vulnerabilities: Weak Cryptography for Passwords
The following versions of Multilin SR protective relays are affected:
Successful exploitation of this vulnerability may allow a remote attacker to obtain weakly encrypted user passwords, which could be used to gain unauthorized access to affected products.
GE has released the following firmware versions, which remove access to the cipher text from the front LCD panel and through Modbus in the affected products:
GE is planning to release a firmware update for the 369 Motor Protection Relay in June 2017.
GE recommends that users apply updated firmware versions to affected products, as well as implement the following physical security and network security defensive measures:
GE security advisory, SR-2017-00001 Multilin SR Family of Protective Relays, is available at the following location, with a valid account:
NCCIC/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. 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.
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.
No known public exploits specifically target this vulnerability.
Cipher text versions of user passwords were created with a non-random initialization vector leaving them susceptible to dictionary attacks. Cipher text of user passwords can be obtained from the front LCD panel of affected products and through issued Modbus commands.
GE reported the vulnerability to ICS-CERT. It was initially identified by New York University security researchers Anastasis Keliris, Charalambos Konstantinou, Marios Sazos, and Dr. Michail (Mihalis) Maniatakos.
Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Dams, Energy, Food and Agriculture, Government Facilities, Transportation Systems, Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Boston, Massachusetts