CVE-2008-5027 in Nagios
Summary
by MITRE
The Nagios process in (1) Nagios before 3.0.5 and (2) op5 Monitor before 4.0.1 allows remote authenticated users to bypass authorization checks, and trigger execution of arbitrary programs by this process, via an (a) custom form or a (b) browser addon.
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Analysis
by VulDB Data Team • 08/24/2019
The vulnerability described in CVE-2008-5027 represents a critical authorization bypass flaw affecting Nagios monitoring systems and its derivative op5 Monitor platform. This vulnerability resides within the core Nagios process that handles user authentication and authorization controls, creating a pathway for remote authenticated attackers to escalate their privileges and execute arbitrary code on affected systems. The flaw specifically impacts versions prior to Nagios 3.0.5 and op5 Monitor 4.0.1, indicating a long-standing issue that persisted across multiple releases of these widely deployed monitoring solutions.
The technical implementation of this vulnerability involves two primary attack vectors that exploit weaknesses in the form processing and browser extension handling mechanisms within the Nagios web interface. Attackers can leverage either custom forms or browser addons to manipulate the authentication flow and gain unauthorized access to system execution capabilities. This dual attack surface significantly increases the exploitability of the vulnerability, as it provides multiple entry points for malicious actors to bypass the intended security controls. The flaw essentially allows authenticated users to escalate their privileges without proper authorization checks, effectively breaking the principle of least privilege that should govern access controls in monitoring systems.
The operational impact of this vulnerability is severe and far-reaching, particularly given the critical role that monitoring systems play in enterprise infrastructure security. When exploited, this vulnerability enables attackers to execute arbitrary programs with the privileges of the Nagios process, which typically runs with elevated system permissions to monitor and manage network services. This escalation can lead to complete system compromise, allowing attackers to access sensitive monitoring data, manipulate system configurations, or use the compromised monitoring system as a launch point for further attacks within the network. The implications extend beyond immediate system compromise, as monitoring systems often serve as central points for security information and event management, making them attractive targets for attackers seeking persistent access to enterprise environments.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-284, which addresses improper access control issues in software systems. The flaw demonstrates how inadequate authorization mechanisms can create dangerous escalation paths that bypass fundamental security controls. Additionally, this vulnerability maps to several ATT&CK techniques including T1078 for valid accounts and T1059 for command and script execution, highlighting the multi-stage nature of the attack and the potential for further lateral movement within compromised networks. Organizations relying on these monitoring platforms face significant risk of data exfiltration, system integrity compromise, and potential use as a pivot point for broader network infiltration activities.
Mitigation strategies for this vulnerability require immediate patching of affected systems to versions that address the authorization bypass flaws in the Nagios process. Organizations should also implement network segmentation to limit access to monitoring systems and ensure that only authorized personnel can interact with the web interfaces. Additional security controls including web application firewalls, enhanced monitoring of administrative activities, and regular security assessments of monitoring platform configurations can help detect and prevent exploitation attempts. The vulnerability underscores the importance of maintaining current security patches and conducting regular security audits of critical infrastructure monitoring systems to prevent similar authorization bypass scenarios from compromising enterprise security postures.