ESB-2018.0478 - ALERT [Appliance] GE D60 Line Distance Relay: Execute arbitrary code/commands - Remote/unauthenticated 2018-02-16

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0478
           Advisory (ICSA-18-046-02) GE D60 Line Distance Relay
                             16 February 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           GE D60 Line Distance Relay
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5475 CVE-2018-5473 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-046-02

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Advisory (ICSA-18-046-02)

GE D60 Line Distance Relay

Original release date: February 15, 2018

Legal Notice

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For more information about TLP, see http://www.us-cert.gov/tlp/.

CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: GE

Equipment: D60 Line Distance Relay

Vulnerabilities: Stack-based Buffer Overflow, Improper Restriction of
Operations within the Bounds of a Memory Buffer

AFFECTED PRODUCTS

The following versions of the D60 Line Distance Relay are affected:

  o D60 devices running firmware Version 7.11 and prior.

IMPACT

Successful exploitation of these vulnerabilities could allow a remote attacker
to execute arbitrary code on the device.

MITIGATION

GE has released firmware that addresses the vulnerabilities. The latest
firmware can be obtained from:

https://www.gegridsolutions.com/app/ViewFiles.aspx?prod=d60&type=7

Authentication will be required to download the firmware.

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o When remote access is required, use secure methods, such as Virtual Private
    Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
    be updated to the most current version available. Also recognize that VPN
    is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC 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 NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber
Intrusion Detection and Mitigation Strategies, that is available for download
from the ICS-CERT website.

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW CWE-121

Multiple stack-based buffer overflow vulnerabilities have been identified,
which may allow remote code execution.

CVE-2018-5475 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).

IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119

The SSH functions of the device are vulnerable to buffer overflow conditions
that may allow a remote attacker to execute arbitrary code on the device.

CVE-2018-5473 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).

RESEARCHER

Kirill Nesterov of Kaspersky Labs discovered these vulnerabilities, and GE and
Kasperksy Labs reported and coordinated the vulnerabilities with NCCIC.

BACKGROUND

Critical Infrastructure Sectors: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: USA


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://
ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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