CVE-2002-1959 in Nagios
Summary
by MITRE
Nagios 1.0b1 through 1.0b3 allows remote attackers to execute arbitrary commands via shell metacharacters in plugin output.
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Analysis
by VulDB Data Team • 07/07/2024
The vulnerability described in CVE-2002-1959 represents a critical command injection flaw in Nagios monitoring software versions 1.0b1 through 1.0b3. This issue stems from insufficient input validation and sanitization within the plugin execution framework of the monitoring system, creating a pathway for remote attackers to escalate privileges and execute unauthorized commands on the affected system. The vulnerability specifically targets the handling of plugin output data, where shell metacharacters are not properly escaped or filtered before being processed by the system.
The technical exploitation of this vulnerability occurs when Nagios processes output from external plugins that contain malicious shell metacharacters such as semicolons, ampersands, or backticks. These characters, when improperly handled, can be interpreted by the underlying shell as command separators or operators, allowing attackers to inject and execute arbitrary commands with the privileges of the Nagios process. The flaw resides in the system's failure to implement proper input sanitization mechanisms, which is categorized under CWE-78 as improper neutralization of special elements used in OS commands. This weakness directly enables attackers to bypass normal access controls and gain unauthorized system access.
The operational impact of this vulnerability extends beyond simple command execution, as it can lead to complete system compromise and unauthorized access to sensitive monitoring data. Attackers can leverage this vulnerability to escalate privileges, install backdoors, or manipulate monitoring configurations to hide malicious activities. The vulnerability affects organizations relying on Nagios for critical infrastructure monitoring, potentially exposing their entire network to unauthorized access and data exfiltration. From an attacker's perspective, this represents a high-value target within the enterprise security landscape, as it provides a direct path to compromise monitoring infrastructure that often runs with elevated privileges and has access to sensitive system information.
Security professionals should implement immediate mitigations including upgrading to patched versions of Nagios, implementing proper input validation and sanitization for plugin outputs, and configuring network segmentation to limit access to monitoring systems. The vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter, specifically focusing on the execution of commands through shell metacharacters. Organizations should also consider implementing network monitoring to detect suspicious command execution patterns and establish robust patch management processes to prevent similar vulnerabilities from affecting other monitoring and security tools. The incident highlights the critical importance of input validation in security-critical applications and demonstrates how seemingly minor flaws in data handling can result in significant system compromise.