CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
58.8%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: GE
Equipment: Multilin SR, UR, and URplus Protective Relays
Vulnerabilities: Weak Cryptography for Passwords
This updated advisory is a follow-up to the updated advisory titled ICSA-17-117-01A GE Multilin SR Protective Relays that was published May 18, 2017, on the NCCIC/ICS-CERT web site.
The following versions of Multilin SR protective relays are affected:
--------- Begin Update B Part 1 of 2 --------
The following versions of the Multilin Universal Relay (UR) and URplus relay families are affected:
GE has identified additional legacy products that are affected:
--------- End Update B Part 1 of 2 ----------
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:
--------- Begin Update B Part 2 of 2 --------
GE’s download link for 760 Feeder Protection Relay, Version 7.47 is as follows:
http://www.gegridsolutions.com/app/downloadfile.aspx?prod=750&type=7&file=2
GE’s download link for 750 Feeder Protection Relay, Version 7.47 is as follows (login required):
http://www.gegridsolutions.com/app/downloadfile.aspx?prod=750&type=7&file=2
GE’s download link for 745 Transformer Protection Relay, Version 5.23 is as follows (login required):
http://www.gegridsolutions.com/app/downloadfile.aspx?prod=745&type=7&file=2
GE’s download link for 489 Generator Protection Relay, Version 4.06 is as follows (login required):
http://www.gegridsolutions.com/app/downloadfile.aspx?prod=489&type=7&file=2
GE’s download link for 469 Motor Protection Relay, Version 5.23 is as follows (login required):
http://www.gegridsolutions.com/app/downloadfile.aspx?prod=469&type=7&file=2
GE’s download link for 369 Motor Protection Relay, Version 3.63 is as follows (login required):
http://www.gegridsolutions.com/app/downloadfile.aspx?prod=369&type=7&file=2
GE security advisory, UR-2017-00001 Multilin UR/URPlus Family of Protective Relays, is available at the following location, with a valid account:
http://www.gegridsolutions.com/app/ViewFiles.aspx?prod=t60&type=21
GE had identified additional legacy products that have the same vulnerability as the SR protective relays and in response, has released the following updated firmware versions:
GE’s download link for the MM300 Motor Management Relay, firmware Version 1.71 is as follows (login required):
GE’s release notification is as follows:
<http://www.gegridsolutions.com/products/support/mm300/GER-4807.pdf>
GE’s download link for the MM200 Motor Management System, firmware Version 1.25 is as follows (login required):
GE’s release notification is as follows:
<http://www.gegridsolutions.com/products/support/mm200/GER-4801.pdf>
For more information about the availability of this firmware version, contact GE’s support:
<http://www.gegridsolutions.com/multilin/support.aspx>.
For more information about the availability of this firmware version, contact GE’s support:
<http://www.gegridsolutions.com/multilin/support.aspx>.
GE’s download link for the 350 Feeder Protection Relay, firmware Version 2.30 is as follows (login required):
GE’s release notification is as follows:
<http://www.gegridsolutions.com/products/support/3Series/GER-4791.pdf>
GE’s download link for the 345 Transformer Protection Relay, firmware Version 2.30, is as follows (login required):
GE’s release notification is as follows:
<http://www.gegridsolutions.com/products/support/3Series/GER-4791.pdf>
GE’s download link for the 339 Motor Protection Relay, firmware Version 2.30, is as follows (login required):
GE’s release notification is as follows:
<http://www.gegridsolutions.com/products/support/3Series/GER-4791.pdf>
GE’s download link for the T1000 Switch, firmware Version 03A02 is as follows (login required):
--------- End Update B Part 2 of 2 ----------
GE UR firmware versions 7.xx are not affected. GE has released updates that remove the ability to obtain the password cipher text in the following firmware versions:
The Universal Relay firmware is available at the following location:
https://www.gegridsolutions.com/app/ViewFiles.aspx?prod=urfamily&type=7
GE reports that the URplus platform will have firmware updates released in July 2017 for the following product versions:
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:
https://www.gegridsolutions.com/app/ViewFiles.aspx?prod=750&type=21
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.
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).
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
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-7905
www.gegridsolutions.com/app/downloadfile.aspx?prod=369&type=7&file=2
www.gegridsolutions.com/app/downloadfile.aspx?prod=469&type=7&file=2
www.gegridsolutions.com/app/downloadfile.aspx?prod=489&type=7&file=2
www.gegridsolutions.com/app/downloadfile.aspx?prod=745&type=7&file=2
www.gegridsolutions.com/app/downloadfile.aspx?prod=750&type=7&file=2
www.gegridsolutions.com/app/downloadfile.aspx?prod=750&type=7&file=2
www.gegridsolutions.com/app/ViewFiles.aspx?prod=t60&type=21
www.gegridsolutions.com/multilin/support.aspx
www.gegridsolutions.com/multilin/support.aspx
www.gegridsolutions.com/Passport/Login.aspx?ReturnUrl=%2fapp%2fDownloadFile.aspx%3fprod%3d339%26type%3d7%26file%3d2
www.gegridsolutions.com/Passport/Login.aspx?ReturnUrl=%2fapp%2fDownloadFile.aspx%3fprod%3d345%26type%3d7%26file%3d2
www.gegridsolutions.com/Passport/Login.aspx?ReturnUrl=%2fapp%2fDownloadFile.aspx%3fprod%3d350%26type%3d7%26file%3d3
www.gegridsolutions.com/Passport/Login.aspx?ReturnUrl=%2fapp%2fDownloadFile.aspx%3fprod%3dMm200%26type%3d7%26file%3d3
www.gegridsolutions.com/Passport/Login.aspx?ReturnUrl=%2fapp%2fDownloadFile.aspx%3fprod%3dMM300%26type%3d7%26file%3d2
www.gegridsolutions.com/Passport/Login.aspx?ReturnUrl=%2fapp%2fDownloadFile.aspx%3fprod%3dS20-T1000%26type%3d7%26file%3d3
www.gegridsolutions.com/products/support/3Series/GER-4791.pdf
www.gegridsolutions.com/products/support/3Series/GER-4791.pdf
www.gegridsolutions.com/products/support/3Series/GER-4791.pdf
www.gegridsolutions.com/products/support/mm200/GER-4801.pdf
www.gegridsolutions.com/products/support/mm300/GER-4807.pdf
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
58.8%