ASPECT is an award-winning scalable building energy management and control solution designed to allow users seamless access to their building data through standard building protocols including smart devices.
ABB Cylon Aspect BMS/BAS is vulnerable to a critical flaw in the AuthenticatedHttpServlet within its application server, enabling remote attackers to bypass authentication by setting the Host: 127.0.0.1 header. This deceives the server into processing requests as if they originate from localhost, granting unauthorized access to privileged operations. This bypass grants access to privileged functionality, including the HTTPDownloadServlet, which is vulnerable to directory traversal. By leveraging this, an attacker can write arbitrary PHP files outside the intended directory scope. When combined, these issues allow remote attackers to upload a malicious PHP shell and execute system commands with the privileges of the web server, leading to full system compromise.