|2017-04-27||Other||GE||GE reported the vulnerability to ICS-CERT. It was initially identified by New York University security researchers Anastasis Kel||N/A||CVE-2017-7905 ||N/A||N/A||N/A|
# GE Multilin SR Protective Relays
### VULNERABLE VENDOR
### VULNERABLE PRODUCT
Multilin SR Protective Relays
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.
### AFFECTED PRODUCTS
The following versions of Multilin SR protective relays are affected:
750 Feeder Protection Relay, firmware versions prior to Version 7.47,
760 Feeder Protection Relay, firmware versions prior to Version 7.47,
469 Motor Protection Relay, firmware versions prior to Version 5.23,
489 Generator Protection Relay, firmware versions prior to Version 4.06,
745 Transformer Protection Relay, firmware versions prior to Version 5.23, and
369 Motor Protection Relay, all firmware versions.
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.
### VULNERABILITY OVERVIEW
WEAK CRYPTOGRAPHY FOR PASSWORDS CWE-261
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.
CVE-2017-7905 has been assigned to this vulnerability.
A CVSS v3 base score of 8.1 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
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
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:
750 Feeder Protection Relay, Version 7.47,
760 Feeder Protection Relay, Version 7.47,
469 Motor Protection Relay, Version 5.23,
489 Generator Protection Relay, Version 4.06, and
745 Transformer Protection Relay, Version 5.23.
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:
Control access to affected products by keeping devices in a locked and secure environment,
Remove passwords when decommissioning devices,
Monitor and block malicious network activity, and
Implement appropriate network segmentation and place affected devices within the control system network, behind properly configured firewalls. Protection and Control system devices should not be directly connected to the Internet or business networks.
GE security advisory, SR-2017-00001 Multilin SR Family of Protective Relays, is available at the following location, with a valid account: