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Siemens Climatix (Update A)

Monitor6.1ICS-CERT ICSA-20-105-04Apr 14, 2020
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary

Siemens Climatix POL908 (BACnet/IP module) and POL909 (AWM module) are vulnerable to reflected cross-site scripting (XSS) attacks through the web interface. The vulnerabilities (CWE-79 reflected XSS and CWE-80 improper neutralization) allow an attacker to inject malicious scripts that execute in a user's browser, potentially compromising session tokens, credentials, or triggering unauthorized configuration changes. The web interface is enabled by default in some configurations and lacks authentication controls by default.

What this means
What could happen
An attacker who tricks a user into clicking a malicious link or visiting a compromised website could inject malicious scripts into the Climatix web interface, potentially stealing session data, modifying device configuration, or redirecting users to phishing sites.
Who's at risk
Building automation system operators and facility managers who use Siemens Climatix climate control modules (POL908 and POL909) for HVAC management and building integration. Risk is highest for installations with the web interface enabled for remote or on-site monitoring.
How it could be exploited
An attacker crafts a malicious URL or embeds it in a phishing email targeting staff who access the Climatix POL908 or POL909 web interface. When a user clicks the link, reflected XSS (cross-site scripting) code executes in their browser, allowing the attacker to capture credentials, hijack the session, or alter device settings through the web UI.
Prerequisites
  • User must access the Climatix web interface via a web browser
  • Web interface must be enabled on POL908 or POL909
  • User must click a malicious link or visit a crafted URL
  • No authentication is enforced on the web interface (default configuration)
remotely exploitablelow complexityuser interaction required (phishing/social engineering)no authentication required by defaultreflected XSS vulnerability
Exploitability
Low exploit probability (EPSS 0.4%)
Affected products (2)
1 with fix1 EOL
ProductAffected VersionsFix Status
Climatix POL908 (BACnet/IP module): All versionsAll versionsNo fix (EOL)
Climatix POL909 (AWM module): All<V11.3211.32
Remediation & Mitigation
0/9
Do now
0/4
WORKAROUNDIf the web interface must remain enabled, enforce authentication and change the default ADMIN password
WORKAROUNDDisable JavaScript in web browsers used to access the Climatix web interface
WORKAROUNDUse a modern web browser with integrated XSS filtering
WORKAROUNDDisable access to default webpages on POL909 and use only custom web applications
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

Climatix POL909 (AWM module): All
HOTFIXUpdate Climatix POL909 (AWM module) to version 11.32 or later
All products
HOTFIXUpdate Climatix POL908 to version 11.22 or later to disable the web interface by default
Mitigations - no patch available
0/3
Climatix POL908 (BACnet/IP module): All versions has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGIsolate Climatix devices behind a firewall and restrict network access to the web interface
HARDENINGEnsure Climatix devices are not accessible from the Internet or business networks
HARDENINGConsider removing POL908 and using the integrated BACnet/IP capability in newer Climatix 600 controllers instead
View full CISA ICS-CERT advisory
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