CVE-2011-10037 in Nagios
Summary
by MITRE • 10/31/2025
Nagios XI versions prior to 2011R1.9 are vulnerable to cross-site scripting (XSS) via the handling of xiwindow variables used to build permalinks in the web interface. Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.
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Analysis
by VulDB Data Team • 12/22/2025
The vulnerability identified as CVE-2011-10037 affects Nagios XI versions prior to 2011R1.9 and represents a critical cross-site scripting flaw that undermines the security of the web-based monitoring interface. This vulnerability specifically targets the handling of xiwindow variables that are utilized to construct permalinks within the application's user interface. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly escape user-supplied data before incorporating it into web responses. Attackers can exploit this weakness by crafting malicious xiwindow parameters that contain executable script code, which then gets rendered in the browser context of authenticated users who visit the affected pages.
The technical implementation of this vulnerability aligns with CWE-79, which categorizes cross-site scripting as a weakness where applications fail to properly validate or escape user input before including it in dynamically generated web content. This particular implementation allows attackers to inject malicious scripts that execute within the victim's browser session, potentially leading to session hijacking, credential theft, or unauthorized administrative actions. The attack vector is particularly concerning because it leverages the legitimate permalink functionality of the application, making it more difficult for users to distinguish between benign and malicious content. The vulnerability exists in the web interface layer where user input is processed without adequate sanitization, creating a persistent threat vector that can be exploited by both authenticated and unauthenticated attackers depending on the specific implementation details.
The operational impact of this vulnerability extends beyond simple script execution to encompass potential complete system compromise when combined with other attack vectors. An attacker who successfully injects malicious code can manipulate the monitoring interface to hide or alter critical alerts, redirect users to malicious sites, or even establish persistent backdoors through the compromised browser session. The vulnerability's exploitation can lead to unauthorized access to sensitive monitoring data, system compromise through session hijacking, and potential privilege escalation within the Nagios XI environment. Given that Nagios XI serves as a critical infrastructure monitoring solution, the compromise of its web interface can result in significant operational disruptions and security breaches that may go undetected for extended periods.
Mitigation strategies for this vulnerability should focus on immediate patching of affected Nagios XI installations to version 2011R1.9 or later, which contains the necessary input validation and sanitization fixes. Organizations should implement comprehensive input validation at multiple layers of the application architecture, ensuring that all user-supplied data is properly escaped before being incorporated into web responses. Network segmentation and web application firewalls can provide additional defense-in-depth measures to detect and prevent exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other monitoring tools and web applications. The remediation process must also include user education regarding the dangers of clicking suspicious links and the importance of maintaining up-to-date security patches. Organizations should consider implementing automated patch management systems to ensure timely deployment of security updates and establish monitoring procedures to detect potential exploitation attempts through anomalous web traffic patterns or unauthorized access attempts. This vulnerability demonstrates the critical importance of input validation in web applications and aligns with ATT&CK technique T1059.007 for script injection, emphasizing the need for robust security controls in monitoring and management interfaces.