Carel pCOWeb HVAC BACnet Gateway is a network device used in building management systems to bridge BACnet communication for HVAC control. Facility managers and HVAC engineers rely on it to remotely monitor and adjust heating, ventilation, and air conditioning parameters via a web-based interface. This gateway enhances interoperability between BACnet devices and supports energy-efficient operations in commercial and industrial environments. Its role is critical for maintaining optimal indoor climate conditions and reducing operational costs through centralized oversight.
CVE-2022-37122 is a path traversal vulnerability that arises from insufficient input validation in the gateway's web server. Attackers can manipulate file path parameters to access directories and files outside the intended webroot. This flaw typically occurs when user-supplied input is not sanitized or filtered for directory traversal sequences like '../'. The vulnerability allows unauthenticated exploitation, making it particularly dangerous for exposed systems.
The vulnerable endpoint is the web interface's file retrieval function, often triggered via HTTP GET requests to paths such as /cgi-bin/ or /images/. By injecting traversal sequences (e.g., ../../../etc/passwd), an attacker can read arbitrary files from the gateway's filesystem. The parameter responsible is likely a filename or path variable that is passed directly to file system calls without proper validation. This enables access to sensitive files like configuration databases, credentials, or system logs.
Successful exploitation can lead to disclosure of critical system information, including network configurations, BACnet device credentials, and encryption keys. This exposure may enable further attacks, such as lateral movement within the building management network or manipulation of HVAC settings. In worst-case scenarios, attackers could disrupt building climate control, causing safety hazards or significant energy waste. The CVSS score of 7.5 reflects the high impact on confidentiality and the ease of exploitation without authentication.
- Apply the latest firmware patch from Carel to address CVE-2022-37122.
- Implement strict input validation to reject directory traversal sequences (e.g., ../) in file path parameters.
- Restrict web interface access to trusted IP addresses using firewall rules or VPN.
- Disable unnecessary web services and file retrieval functions on the gateway.
- Use web application firewalls (WAF) to filter malicious requests targeting path traversal.
- Conduct regular security audits and vulnerability scans to identify similar flaws.
- Enforce least privilege access controls on the gateway's file system.
- Monitor logs for unusual file access patterns and set up alerts for potential exploitation attempts.
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