CVE-2019-18869 in Remote Kiln Control
Summary
by MITRE
Leftover Debug Code in Blaauw Remote Kiln Control through v3.00r4 allows a user to execute arbitrary php code via /default.php?idx=17.
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Analysis
by VulDB Data Team • 05/08/2020
The vulnerability identified as CVE-2019-18869 represents a critical security flaw in the Blaauw Remote Kiln Control software version 3.00r4 and earlier. This issue stems from the presence of leftover debug code within the application's codebase, which creates an unintended attack surface that can be exploited by malicious actors. The vulnerability specifically manifests through the default.php script where the idx parameter is processed without proper input validation or sanitization, allowing for arbitrary code execution. The presence of debug code in a production environment constitutes a fundamental security misconfiguration that violates basic security principles and best practices.
The technical exploitation of this vulnerability occurs through the manipulation of the idx parameter in the default.php URL, where idx=17 serves as the trigger point for the debug functionality. When a user accesses this specific parameter value, the application fails to properly validate or sanitize the input, enabling an attacker to inject and execute arbitrary PHP code within the context of the web server. This type of vulnerability falls under CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and specifically relates to situations where debug code is inadvertently left in production code. The attack vector operates through parameter manipulation and demonstrates a classic example of insufficient input validation that allows for code injection attacks.
The operational impact of this vulnerability is severe as it provides attackers with complete control over the affected system. Once exploited, an attacker can execute arbitrary commands on the web server, potentially leading to full system compromise, data exfiltration, or the establishment of persistent backdoors. The vulnerability affects industrial control systems that manage kiln operations, which are critical infrastructure components in manufacturing environments. These systems often handle sensitive operational data and process control functions, making them attractive targets for attackers seeking to disrupt operations or gain unauthorized access to critical manufacturing processes. The implications extend beyond simple web application compromise, as the affected kiln control systems may be part of larger industrial networks that require robust security controls.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements. The primary recommendation involves removing all leftover debug code from the production environment and implementing proper input validation mechanisms for all user-supplied parameters. Organizations should conduct comprehensive code reviews to identify and eliminate similar debug code artifacts that may exist in other parts of the application. The implementation of proper parameter sanitization and validation techniques, such as those recommended by the OWASP Top Ten, should be enforced throughout the application. Additionally, regular security assessments and penetration testing should be conducted to identify potential security flaws before they can be exploited. The vulnerability also highlights the importance of following secure coding practices and conducting thorough security testing during the development lifecycle to prevent such issues from reaching production environments. Organizations should implement proper access controls and network segmentation to limit the potential impact of successful exploitation attempts.