CVE-2018-6909 in RainMachine Mini-8
Summary
by MITRE
A missing X-Frame-Options header in the Green Electronics RainMachine Mini-8 (2nd Generation) and Touch HD 12 web application could be used by a remote attacker for clickjacking, as demonstrated by triggering an API page request.
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Analysis
by VulDB Data Team • 04/09/2020
The Green Electronics RainMachine Mini-8 (2nd Generation) and Touch HD 12 devices present a critical web application security vulnerability through the absence of the X-Frame-Options HTTP response header. This configuration flaw creates a significant attack surface that allows remote adversaries to execute clickjacking attacks against authenticated users of the web interface. The vulnerability specifically affects the web applications running on these smart irrigation controllers, which are designed for remote management and configuration through browser-based interfaces. The missing security header represents a fundamental failure in implementing proper defensive measures against UI redressing attacks that can manipulate user interactions and potentially compromise device functionality.
The technical implementation flaw stems from the web server configuration failing to include the X-Frame-Options header in HTTP responses generated by the RainMachine web applications. This header serves as a crucial security mechanism that instructs web browsers to prevent rendering the content within an iframe context, thereby protecting against clickjacking attacks where malicious actors overlay transparent layers to deceive users into performing unintended actions. The vulnerability becomes particularly dangerous when combined with the device's API functionality, as demonstrated in the exploit scenario where an attacker can trigger API page requests through crafted malicious web pages that embed the legitimate device interface within invisible frames. This allows attackers to manipulate user interactions without the victim's knowledge, potentially enabling unauthorized configuration changes or data manipulation.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential system compromise and unauthorized administrative access. Attackers can leverage the clickjacking vector to perform authenticated actions on behalf of legitimate users, potentially leading to unauthorized device configuration changes, data exfiltration, or even complete device takeover. The vulnerability affects users who access the RainMachine web interfaces remotely, making it particularly concerning for home and commercial irrigation systems that may be exposed to the internet. The attack scenario demonstrates how an attacker can craft malicious web pages that embed the device's API interface within invisible frames, tricking users into performing actions they believe are occurring on a legitimate website while actually executing commands on the vulnerable device.
Security professionals should recognize this vulnerability as a direct violation of established web application security best practices and defensive coding principles. The absence of the X-Frame-Options header represents a configuration error that aligns with CWE-16, which covers "Configuration' and specifically addresses the lack of proper security headers in web applications. This vulnerability also maps to ATT&CK technique T1211, which covers 'Exploitation for Defense Evasion" through the use of web-based attack vectors that bypass traditional security controls. Organizations should implement immediate mitigations including the addition of the X-Frame-Options header with appropriate values such as 'DENY' or 'SAMEORIGIN' to prevent frame embedding, along with comprehensive network segmentation to limit direct internet exposure of these devices. Additionally, users should be educated about the risks of visiting untrusted websites while logged into sensitive web applications, as this vulnerability specifically targets user interaction manipulation rather than direct code execution or privilege escalation attacks.