The FUXA software is an open-source web interface for SCADA/HMI monitoring and control, designed primarily for industrial environments to oversee processes and equipment. It is widely used by process engineers and operators to interact with a diverse range of hardware and systems, providing a graphical user interface for system diagnostics and data acquisition. The application offers real-time monitoring capabilities and a customizable interface to suit various operational needs. FUXA supports multiple protocols and platforms, making it a versatile solution for complex system integrations. Because it is open-source, anyone in the industrial software community can contribute to or modify the software to meet specific enterprise requirements.
Path Traversal vulnerabilities occur when an application improperly sanitizes user input, allowing an attacker to navigate the file system outside the application's root directory. This particular vulnerability in FUXA occurs within an unauthenticated '/api/upload' endpoint, where malicious actors can exploit the improperly resolved 'destination' field. Attackers can use this flaw to traverse directories and specify paths that the application does not restrict, leading to unintended file operations. The vulnerability can be especially harmful as it allows writing files beyond the intended directories, potentially leading to additional security compromises like remote code execution.
The vulnerability exists in the '/api/upload' POST endpoint of FUXA, where the application resolves the 'destination' field from JSON requests without proper containment checks. An attacker can manipulate directory paths using "../" segments to escape the application's root directory, enabling the writing of arbitrary files on the server's file system. This unsanctioned writing capability can be leveraged to overwrite critical configurations, place malicious files into execution paths, or facilitate unauthorized access to the system. The lack of authentication for this endpoint compounds the severity of the issue, as it does not require credentials to exploit.
If exploited, this vulnerability could lead to severe security ramifications, including unauthorized access and remote code execution. Since attackers can write files anywhere within the file system accessible by FUXA's service account, they can potentially inject scripts into the web root, alter cron jobs, or even modify SSH keys for persistent access. Such unintended file modifications could allow attackers to execute arbitrary commands on the server, effectively compromising the entire application and the data it handles. In critical infrastructure environments, this could lead to operational disruptions and unauthorized manipulation of industrial processes.
REFERENCES
- https://github.com/frangoteam/FUXA/security/advisories/GHSA-88qh-cphv-996c
- https://github.com/frangoteam/FUXA/commit/22c2192f5d9beef8a787c45eff3a14c24dbb5f96
- https://github.com/frangoteam/FUXA/releases/tag/v1.2.10
- https://github.com/Hann1bl3L3ct3r/FUXAPWN
- https://nvd.nist.gov/vuln/detail/CVE-2026-25895
- Upgrade FUXA to version 1.2.10 or later to patch the path traversal vulnerability.
- Implement input validation to ensure the 'destination' parameter does not contain directory traversal patterns.
- Introduce authentication checks for sensitive endpoints to prevent unauthorized access.
- Conduct regular security audits to identify and mitigate similar vulnerabilities.
- Employ file system monitoring tools to detect unauthorized file changes in real-time.
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