spaceLYnk, Wiser For KNX, fellerLYnk
Act Now9.3SEVD-2022-039-04Feb 8, 2022
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
Multiple vulnerabilities exist in spaceLYnk (≤V2.6.2), Wiser for KNX (≤V2.6.2), and fellerLYnk (≤V2.6.2) controllers. These include missing authentication controls, Cross-Site Request Forgery (CSRF), rate limiting issues, and Stored Cross-Site Scripting (XSS) in the web management interface. An attacker could bypass login, trick authenticated users into performing unauthorized actions, inject malicious scripts, or exfiltrate system data and credentials. spaceLYnk and Wiser for KNX are fixed in version 2.7.0. fellerLYnk status is unclear from the advisory.
What this means
What could happen
An attacker could bypass authentication, perform unauthorized actions on your building automation system (such as altering HVAC setpoints or disabling security controls), or steal configuration data and credentials through web-based attacks on the management interface.
Who's at risk
Building automation and energy management operators running Schneider Electric spaceLYnk, Wiser for KNX, or Feller fellerLYnk controllers. These systems manage HVAC, lighting, occupancy controls, and energy distribution in commercial buildings. Energy utilities and facility managers responsible for these systems should prioritize patching.
How it could be exploited
An attacker with network access to the web interface could craft a malicious request or webpage that tricks an authenticated user into performing unauthorized actions (CSRF), inject malicious scripts that execute in other users' browsers (XSS), or bypass login controls entirely (missing authentication) to gain direct access to the system.
Prerequisites
- Network access to the web management interface (typically port 80/443)
- For CSRF attacks: authenticated user must visit attacker-controlled page while logged into the system
- For XSS attacks: attacker must inject malicious payload through a vulnerable input field
- For authentication bypass: no special prerequisites—attacker can attempt direct access
remotely exploitablelow complexityaffects building automation and safety-related controlsCSRF and XSS can lead to unauthorized process changesauthentication weaknesses allow direct access
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (3)
2 with fix1 pending
ProductAffected VersionsFix Status
spaceLYnk V2.6.2 and prior≤ V2.6.22.7.0
Wiser for KNX (formerly homeLYnk) V2.6.2 and prior≤ V2.6.22.7.0
fellerLYnk V2.6.2 and prior≤ V2.6.2No fix yet
Remediation & Mitigation
0/5
Do now
0/2HARDENINGFor fellerLYnk: Contact Feller support regarding patch status, as version 2.7.0 remediation details are unclear; implement network segmentation immediately as compensating control
WORKAROUNDRestrict network access to the web management interface to authorized administrative subnets only
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HOTFIXUpdate spaceLYnk to version 2.7.0 or later and perform system reboot
HOTFIXUpdate Wiser for KNX to version 2.7.0 or later and perform system reboot
Long-term hardening
0/1HARDENINGImplement Web Application Firewall (WAF) rules to detect and block CSRF and XSS payloads if available
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API:
/api/v1/advisories/58964008-f92a-4925-b187-b1b64d3bd196