CVE-2024-13722 in NagVis
Summary
by MITRE • 02/05/2025
The "NagVis" component within Checkmk is vulnerable to reflected cross-site scripting. An attacker can craft a malicious link that will execute arbitrary JavaScript in the context of the browser once clicked. The attack can be performed on both authenticated and unauthenticated users.
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Analysis
by VulDB Data Team • 03/06/2025
The NagVis component within Checkmk presents a critical reflected cross-site scripting vulnerability identified as CVE-2024-13722 that fundamentally compromises web application security. This vulnerability exists within the web interface of Checkmk's monitoring solution, specifically affecting the NagVis visualization component that displays network monitoring data. The flaw allows attackers to inject malicious JavaScript code through crafted URLs that are then executed in the victim's browser context, creating a persistent security risk for organizations relying on this monitoring infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the NagVis component's web request handling mechanisms. When users navigate to specially crafted URLs containing malicious script payloads, the application fails to properly sanitize user-supplied parameters before incorporating them into web responses. This reflected XSS vulnerability operates through the standard web application attack vector where malicious input is immediately reflected back to the user without proper sanitization, allowing JavaScript execution in the victim's browser session. The vulnerability manifests when the application processes URL parameters or other user-controllable inputs without implementing appropriate security controls such as Content Security Policy headers or proper HTML encoding.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with significant capabilities to compromise user sessions and access sensitive monitoring data. Both authenticated and unauthenticated users remain vulnerable, meaning that attackers can exploit this weakness even without valid credentials, potentially allowing them to access network monitoring dashboards, view system configurations, or manipulate displayed data. The attack surface is particularly concerning for organizations using Checkmk for critical infrastructure monitoring, as successful exploitation could enable attackers to gain insights into network topology, system vulnerabilities, or operational status information. This vulnerability directly aligns with CWE-79, which defines cross-site scripting flaws, and represents a significant risk to web application security and user session integrity.
Organizations should implement immediate mitigations including input validation for all user-supplied parameters, deployment of Content Security Policy headers, and proper HTML encoding of output data to prevent script injection. The vulnerability's classification under the ATT&CK framework as part of the Web Application Attack Surface allows threat actors to leverage this weakness for initial access or privilege escalation within monitored environments. Security teams should conduct thorough vulnerability assessments of their Checkmk installations, update to patched versions, and implement network monitoring to detect potential exploitation attempts. Additionally, user education regarding suspicious links and implementing web application firewalls can provide additional defense layers against exploitation attempts targeting this specific vulnerability.