CVE-2018-15709 in Nagios XI
Summary
by MITRE
Nagios XI 5.5.6 allows remote authenticated attackers to execute arbitrary commands via a crafted HTTP request.
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Analysis
by VulDB Data Team • 04/12/2020
The vulnerability identified as CVE-2018-15709 represents a critical remote code execution flaw within Nagios XI version 5.5.6, a widely deployed network monitoring and infrastructure management platform. This issue arises from insufficient input validation and sanitization mechanisms within the application's HTTP request processing pipeline, creating a pathway for authenticated attackers to inject and execute malicious commands on the underlying system. The vulnerability specifically affects the web-based administration interface where user-supplied parameters are improperly handled during request processing, allowing for command injection attacks that can escalate to full system compromise.
The technical exploitation of this vulnerability occurs through carefully crafted HTTP requests that manipulate input fields within the Nagios XI web interface. Attackers must first establish valid authentication credentials to access the system, as the vulnerability requires authenticated access but does not impose additional privilege requirements beyond standard user accounts. The flaw manifests when the application fails to properly sanitize user-provided data before incorporating it into system commands or shell executions, creating a classic command injection scenario. This weakness aligns with CWE-77 and CWE-88 categories, which specifically address improper neutralization of special elements used in command execution and command injection vulnerabilities. The vulnerability can be leveraged to execute arbitrary operating system commands with the privileges of the web server process, potentially allowing attackers to gain complete control over the monitoring server.
The operational impact of this vulnerability extends beyond simple unauthorized code execution, as it can lead to complete system compromise and data exfiltration within monitored environments. Attackers can leverage this vulnerability to establish persistent access, escalate privileges, or use the compromised system as a pivot point to attack other network components. The affected Nagios XI platform serves as a critical monitoring component in many enterprise environments, making this vulnerability particularly dangerous as it can provide attackers with visibility into network infrastructure and potentially enable further lateral movement within the organization. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) techniques, as it enables both command execution and privilege escalation capabilities.
Mitigation strategies for CVE-2018-15709 should prioritize immediate patch application from Nagios Inc. as the primary defense mechanism, since the vendor has released security updates addressing the root cause of the command injection vulnerability. Organizations should implement network segmentation and access controls to limit exposure of the Nagios XI interface to trusted networks only, while also enforcing strict authentication mechanisms including multi-factor authentication and role-based access controls. Additional defensive measures include implementing web application firewalls to detect and block malicious HTTP requests, monitoring for unusual command execution patterns, and conducting regular security assessments of the monitoring infrastructure. Network administrators should also establish comprehensive logging and monitoring of administrative activities within the Nagios XI environment to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of input validation and proper sanitization in web applications, as outlined in OWASP Top Ten and NIST cybersecurity guidelines, emphasizing that even authenticated access can lead to catastrophic system compromise when proper security controls are absent.