CVE-2018-18836 in Netdata
Summary
by MITRE
An issue was discovered in Netdata 1.10.0. JSON injection exists via the api/v1/data tqx parameter because of web_client_api_request_v1_data in web/api/web_api_v1.c.
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Analysis
by VulDB Data Team • 02/03/2025
The vulnerability identified as CVE-2018-18836 represents a critical JSON injection flaw within the Netdata monitoring platform version 1.10.0. This issue resides in the web API component where the tqx parameter in the api/v1/data endpoint fails to properly sanitize user input, creating an avenue for malicious actors to inject arbitrary JSON data into the system. The vulnerability is particularly concerning as it affects the core data retrieval functionality of the monitoring solution, which is fundamental to how system administrators and security teams monitor network performance and resource utilization across their infrastructure. The affected code path originates from web_client_api_request_v1_data function within web/api/web_api_v1.c, indicating that this is a server-side processing issue rather than a client-side vulnerability.
The technical exploitation of this vulnerability stems from inadequate input validation and sanitization mechanisms within the API layer. When users submit requests to the api/v1/data endpoint with maliciously crafted tqx parameter values, the system processes these inputs without sufficient protection against JSON injection attacks. This creates a scenario where attackers can manipulate the JSON response format, potentially leading to data corruption, unauthorized access to monitoring data, or even arbitrary code execution depending on how the application processes the injected JSON content. The vulnerability aligns with CWE-74, which describes improper neutralization of special elements used in JSON input, and represents a classic example of insufficient input sanitization in web applications. The attack surface is particularly broad since the API endpoint is designed to provide real-time monitoring data, making it a critical component that must remain secure and reliable.
The operational impact of CVE-2018-18836 extends beyond simple data integrity concerns, as it can compromise the entire monitoring infrastructure that organizations rely upon for security operations and system management. Attackers who successfully exploit this vulnerability could potentially gain unauthorized access to sensitive monitoring data, observe system performance metrics that reveal system weaknesses, or manipulate the data to create false security alerts that could mask actual security incidents. This type of vulnerability directly impacts the CIA triad, specifically compromising the integrity and confidentiality of monitoring data. The vulnerability also aligns with ATT&CK technique T1071.004 for Application Layer Protocol: DNS and T1566.001 for Phishing: Spearphishing Attachment, as it could be leveraged in reconnaissance phases or as part of broader attack campaigns targeting system monitoring capabilities. Organizations using Netdata for security monitoring and incident response may find their ability to detect and respond to threats severely compromised if this vulnerability is exploited.
Mitigation strategies for CVE-2018-18836 should focus on implementing comprehensive input validation and sanitization measures at the API layer, specifically targeting the tqx parameter handling within the web/api/web_api_v1.c file. Organizations should immediately upgrade to Netdata versions that address this vulnerability, as the maintainers have likely released patched versions that properly validate and sanitize all JSON input parameters. Additionally, network administrators should implement API request rate limiting and monitoring to detect anomalous patterns that might indicate exploitation attempts. The implementation of proper JSON parsing libraries with built-in sanitization capabilities can help prevent similar issues in the future. Security teams should also consider implementing web application firewalls that can detect and block malicious JSON injection attempts targeting known vulnerable API endpoints. Regular security assessments of monitoring infrastructure should include verification of input validation mechanisms to prevent similar vulnerabilities from being introduced in future updates or custom modifications to the monitoring platform.