CVE-2024-24819 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the icingaweb2-module-incubator, a bleeding-edge module for the Icinga Web 2 monitoring framework. The vulnerability exists in versions from 0.1.0 up to but not including 0.22.0. The root cause lies in the class gipfl\Web\Form, which is responsible for providing CSRF protection by automatically inserting a CSRF token into forms. However, despite the token being included in the form, the module fails to validate the token upon form submission. This flaw allows an attacker to craft malicious links or web pages that, when visited by an authenticated user, can perform unauthorized actions on their behalf without their knowledge or consent. The vulnerability requires the attacker to have knowledge of a valid user session and the user to interact with a malicious resource (user interaction required). Exploitation requires a high level of privileges (PR:H) and the attack complexity is high (AC:H), indicating some conditions must be met for successful exploitation. The vulnerability impacts confidentiality to a low degree but has a high impact on integrity and a low impact on availability, as unauthorized changes can be made through forged requests. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity). There are no known workarounds, and the vendor has released version 0.22.0 to remediate the issue by properly validating the CSRF token. No known exploits are currently reported in the wild. This vulnerability is significant because Icinga Web 2 is widely used for IT infrastructure monitoring, and unauthorized changes could disrupt monitoring configurations or cause misleading monitoring data.

For European organizations using Icinga Web 2 with the incubator module, this vulnerability poses a risk of unauthorized configuration changes or manipulation of monitoring data. Such unauthorized changes could lead to incorrect alerting, masking of real incidents, or triggering false alarms, thereby undermining operational security and incident response. Organizations in critical infrastructure sectors (e.g., energy, telecommunications, finance) that rely on Icinga for monitoring may experience degraded situational awareness or delayed detection of cyberattacks or system failures. The integrity of monitoring data is crucial for compliance with regulations such as the NIS Directive and GDPR, where accurate system status and incident reporting are mandatory. Attackers exploiting this vulnerability could indirectly impact confidentiality by manipulating monitoring to hide breaches or data exfiltration attempts. Although exploitation requires user interaction and high privileges, insider threats or targeted phishing campaigns could leverage this flaw to escalate impact. The absence of known exploits reduces immediate risk, but the medium severity and lack of workarounds necessitate prompt patching to avoid potential exploitation.

European organizations should upgrade the icingaweb2-module-incubator to version 0.22.0 or later immediately to ensure proper CSRF token validation. Until the upgrade is applied, organizations should restrict access to the Icinga Web 2 interface to trusted networks and users, minimizing exposure to potential attackers. Implement network segmentation and strong authentication controls (e.g., multi-factor authentication) to reduce the risk of session hijacking or unauthorized access. Security teams should monitor web server and application logs for unusual POST requests or unexpected configuration changes indicative of CSRF exploitation attempts. User training to recognize phishing and suspicious links can reduce the risk of user interaction with malicious content. Additionally, consider deploying web application firewalls (WAFs) with custom rules to detect and block suspicious cross-site request patterns targeting the Icinga Web 2 interface. Regularly review and audit Icinga configurations and user activities to detect unauthorized changes promptly. Finally, maintain an up-to-date inventory of affected software versions to ensure timely patch management.