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AUSCERT External Security Bulletin Redistribution
ESB-2019.4706
Advisory (icsa-19-351-01) GE S2020/S2020G Fast Switch 61850
18 December 2019
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AusCERT Security Bulletin Summary
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Product: GE S2020/S2020G Fast Switch 61850
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18267
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-19-351-01
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ICS Advisory (ICSA-19-351-01)
GE S2020/S2020G Fast Switch 61850
Original release date: December 17, 2019
Legal Notice
All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 4.6
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: GE
o Equipment: GE S2020/S2020G Fast Switch 61850
o Vulnerability: Cross-site Scripting
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow an attacker to inject
arbitrary code and allow disclosure of sensitive data.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of GE S2020/S2020G Fast Switch 61850, a managed Ethernet
switch, are affected:
o S2020/S2020G Fast Switch 61850 Versions 07A03 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
An attacker can inject arbitrary Javascript in a specially crafted HTTP request
that may be reflected back in the HTTP response. The device is also vulnerable
to a stored cross-site scripting vulnerability that may allow session
hijacking, disclosure of sensitive data, cross-site request forgery (CSRF)
attacks, and remote code execution.
CVE-2019-18267 has been assigned to this vulnerability. A CVSS v3 base score of
4.6 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:U/
C:L/I:L/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy,
Transportation Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Murat Aydemir of Biznet Bilisim A.S., reported this vulnerability to CISA.
4. MITIGATIONS
GE produced and released Version 07A04, which fixed the vulnerability prior to
the researchers reporting it to CISA.
Users can obtain the newest version at the following link: GE S2020/S2020G Fast
Switch 61850 .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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.
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 users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target this vulnerability.
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