Schneider Electric homeLYnk Controller

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/&gt;

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&gt;

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 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.

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.