CVE-2025-34227 in Nagios
Summary
by MITRE • 09/25/2025
Nagios XI < 2026R1 is vulnerable to an authenticated command injection vulnerability within the MongoDB Database, MySQL Query, MySQL Server, Postgres Server, and Postgres Query wizards. It is possible to inject shell characters into arguments provided to the service and execute arbitrary system commands on the underlying host as the `nagios` user.
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Analysis
by VulDB Data Team • 10/15/2025
This vulnerability exists within Nagios XI versions prior to 2026R1 and represents a critical authenticated command injection flaw that affects multiple database wizards within the system. The vulnerability specifically targets the MongoDB Database, MySQL Query, MySQL Server, Postgres Server, and Postgres Query wizards, creating a significant attack surface for malicious actors who have gained valid credentials. The flaw allows authenticated users to inject shell characters into arguments passed to underlying services, effectively enabling arbitrary command execution on the host system with the privileges of the nagios user account. This represents a severe privilege escalation risk that could allow attackers to compromise the entire monitoring infrastructure and potentially escalate further within the network environment.
The technical nature of this vulnerability aligns with CWE-77 and CWE-94, which classify it as a command injection vulnerability that permits arbitrary code execution. The attack vector requires an authenticated session, meaning that an attacker must first obtain valid credentials to exploit this weakness. However, once authenticated, the impact is substantial as the nagios user typically has elevated privileges within the monitoring environment. The vulnerability stems from insufficient input validation and sanitization within the wizard components that process user-provided arguments for database operations. These wizards likely construct system commands or execute database queries using user-supplied parameters without proper sanitization, creating an environment where shell metacharacters can be interpreted and executed as legitimate commands.
The operational impact of this vulnerability extends beyond simple command execution, as it allows attackers to manipulate the monitoring environment in potentially devastating ways. An attacker with access to the nagios user account could modify monitoring configurations, disable critical alerts, access sensitive monitoring data, or even establish persistence mechanisms within the system. The vulnerability affects database connectivity wizards that are commonly used within monitoring workflows, making it particularly attractive to attackers who wish to compromise the integrity of the monitoring infrastructure. Since Nagios XI systems often serve as critical monitoring points within enterprise environments, this vulnerability could enable attackers to gain visibility into system operations, potentially masking their activities while compromising the organization's ability to detect security incidents.
Organizations should immediately implement mitigations including upgrading to Nagios XI 2026R1 or later versions where this vulnerability has been addressed. Additionally, network segmentation should be implemented to limit access to Nagios XI systems, and privileged access should be strictly controlled through multi-factor authentication and principle of least privilege. Security monitoring should be enhanced to detect unusual command execution patterns or unauthorized configuration changes within the monitoring environment. The implementation of web application firewalls and input validation controls can help prevent exploitation attempts, while regular security audits should verify that no unauthorized access has occurred. Organizations should also conduct comprehensive vulnerability assessments to identify any other systems that may be similarly affected by command injection vulnerabilities in their monitoring infrastructure. This vulnerability demonstrates the critical importance of keeping monitoring systems updated and properly secured, as these tools often serve as the first line of defense in enterprise security operations.