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AUSCERT External Security Bulletin Redistribution
ESB-2017.0182
Schneider Electric homeLYnk Controller
23 January 2017
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AusCERT Security Bulletin Summary
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Product: Schneider Electric homeLYnk Controller
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2017-5157
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-019-01
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Advisory (ICSA-17-019-01)
Schneider Electric homeLYnk Controller
Original release date: January 19, 2017
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/.
CVSS V3 6.3
ATTENTION: Remotely exploitable/low skill level to exploit
Vendor: Schneider Electric
Equipment: homeLYnk Controller, LSS100100
Vulnerability: Cross-site Scripting
AFFECTED PRODUCTS
Schneider Electric reports that the vulnerability affects the following
products:
homeLYnk Controller, LSS100100, all versions prior to V1.5.0
IMPACT
An attacker may be able to exploit this vulnerability to cause execution of
java script code.
MITIGATION
Schneider Electric has made a firmware that fixes this vulnerability available
for download at:
http://www.schneider-electric.com/en/download/document/FW1_5_1-hL/ (link is
external)
For more information on this vulnerability and more detailed mitigation
instructions, please see Schneider Electric security notification
SEVD-2017-011-01 at the following location:
http://www.schneider-electric.com/ww/en/download/document/SEVD-2017-011-01
(link is external)
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of this vulnerability. Specifically, users should:
Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
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.
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 ICSCERT 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.
VULNERABILITY OVERVIEW
CROSS-SITE SCRIPTING CWE-79
The homeLYnk controller is susceptible to a cross-site scripting attack. User
inputs can be manipulated to cause execution of java script code.
CVE-2017-5157 has been assigned to this vulnerability. A CVSS v3 base score of
6.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).
RESEARCHER
Mohammed Shameem reported this issue to Schneider Electric.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
this product.
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