CVE-2019-9203 in Nagios XI
Summary
by MITRE
Authorization bypass in Nagios IM (component of Nagios XI) before 2.2.7 allows closing incidents in IM via the API.
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Analysis
by VulDB Data Team • 08/17/2023
The vulnerability identified as CVE-2019-9203 represents a critical authorization bypass flaw within Nagios IM, a component of the Nagios XI monitoring platform. This issue affects versions prior to 22.7 and specifically permits unauthorized users to manipulate incident management workflows through the application programming interface. The flaw resides in the insufficient validation of user permissions during incident closure operations, creating a pathway for malicious actors to bypass normal access controls and execute actions they should not be authorized to perform. The vulnerability stems from improper implementation of access control mechanisms within the API endpoints responsible for incident management functions, allowing any authenticated user to potentially close incidents regardless of their assigned privileges or roles within the system.
The technical exploitation of this vulnerability occurs through the manipulation of API requests that normally require specific authorization levels to execute incident closure operations. Attackers can craft malicious API calls that bypass the normal permission checking procedures, enabling them to close incidents without proper authorization. This authorization bypass represents a direct violation of the principle of least privilege and can lead to significant operational disruptions. The flaw is classified under CWE-285, which specifically addresses improper authorization within software systems, making it a well-documented category of security weakness. The vulnerability allows for potential data integrity compromise and can be leveraged to mask or eliminate critical security alerts that should remain visible to authorized personnel.
The operational impact of this vulnerability extends beyond simple unauthorized incident closure, as it can be used to manipulate security monitoring workflows and potentially hide malicious activities from detection. When attackers can close incidents through the API, they may be able to suppress legitimate security alerts, creating false negatives in the monitoring system. This capability undermines the fundamental purpose of incident management systems, which are designed to ensure that security events are properly tracked and addressed. The vulnerability also creates potential for audit trail manipulation and can be exploited as part of broader attack campaigns targeting the monitoring infrastructure. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1070.004, which involves the use of API calls to manipulate security systems and can be used to establish persistence or cover tracks within the monitored environment.
Organizations utilizing Nagios XI should immediately implement the vendor-provided patch for version 2.2.7 or later to address this vulnerability. The remediation process should include comprehensive testing of API access controls to ensure that proper authorization mechanisms are functioning correctly. Security teams should also conduct thorough audits of incident management workflows to identify any potential unauthorized activity that may have occurred prior to patching. Additional mitigations include implementing network segmentation to limit API access to trusted sources, enabling detailed logging of all API operations, and conducting regular security assessments of monitoring infrastructure. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and proper access control implementations in monitoring systems, as these components form the backbone of organizational security operations and must remain resilient against exploitation attempts.