Headline
ABB Cylon FLXeon 9.3.4 (cert.js) Authenticated Root Remote Code Execution
The ABB Cylon FLXeon BACnet controller is vulnerable to authenticated remote root code execution via the /api/cert endpoint. An attacker with valid credentials can inject arbitrary system commands by manipulating the affected parameters. The issue arises due to improper input validation in cert.js, where user-supplied data is executed via ChildProcess.exec() without adequate sanitization.
Title: ABB Cylon FLXeon 9.3.4 (cert.js) Authenticated Root Remote Code Execution
Advisory ID: ZSL-2025-5911
Type: Local/Remote
Impact: System Access, DoS
Risk: (5/5)
Release Date: 03.02.2025
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.
Description
The ABB Cylon FLXeon BACnet controller is vulnerable to authenticated remote root code execution via the /api/cert endpoint. An attacker with valid credentials can inject arbitrary system commands by manipulating the affected parameters. The issue arises due to improper input validation in cert.js, where user-supplied data is executed via ChildProcess.exec() without adequate sanitization.
Vendor
ABB Ltd. - 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
Tested On
Linux Kernel 5.4.27
Linux Kernel 4.15.13
NodeJS/8.4.0
Express
Vendor Status
[21.04.2024] Vulnerability discovered.
[22.04.2024] Vendor contacted.
[22.04.2024] Vendor responds.
[02.05.2024] Working with the vendor.
[20.01.2025] Vendor releases version 9.3.5 to address this issue.
[03.02.2025] Coordinated public security advisory released.
PoC
abb_flxeon_rce5.txt
Credits
Vulnerability discovered by Gjoko Krstic - <[email protected]>
References
[1] https://search.abb.com/library/Download.aspx?DocumentID=9AKK108470A5684&LanguageCode=en&DocumentPartId=PDF&Action=Launch
[2] https://www.cve.org/CVERecord?id=CVE-2024-48841
Changelog
[03.02.2025] - Initial release
Contact
Zero Science Lab
Web: https://www.zeroscience.mk
e-mail: [email protected]
Related news
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.
The ABB Cylon FLXeon BACnet controller is vulnerable to authenticated remote root code execution via the /api/timeConfig endpoint. An attacker with valid credentials can inject arbitrary system commands by manipulating parameters such as tz, timeServerYN, and multiple timeDate fields. The vulnerability exists due to improper input validation in timeConfig.js, where user-supplied data is executed via ChildProcess.exec() without adequate sanitization.
The ABB Cylon FLXeon BAS controller is vulnerable to authenticated root command execution via the cmds API. An authenticated attacker can execute arbitrary system commands with root privileges.
The ABB Cylon FLXeon (BACnet) controller suffers from an unauthenticated remote code execution vulnerability with root privileges. Input passed through the login.js script for the password JSON parameter allows out-of-band command injection.