CVE-2018-6533 in Icinga
Summary
by MITRE
An issue was discovered in Icinga 2.x through 2.8.1. By editing the init.conf file, Icinga 2 can be run as root. Following this the program can be used to run arbitrary code as root.
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Analysis
by VulDB Data Team • 02/16/2023
The vulnerability identified as CVE-2018-6533 represents a critical privilege escalation flaw in Icinga 2 monitoring software versions 2.8.1 and earlier. This issue stems from improper access control mechanisms within the software's initialization configuration file handling process. The vulnerability allows malicious actors to manipulate the init.conf file and subsequently execute Icinga 2 with root privileges, creating a significant security risk for systems running this monitoring solution.
The technical exploitation of this vulnerability involves a specific flaw in how Icinga 2 processes its initialization configuration file. When an attacker can modify the init.conf file, they can alter the program's execution environment to run with elevated privileges. This misconfiguration creates a path for privilege escalation where the monitoring daemon can be forced to execute with root permissions, bypassing normal user access controls and system security boundaries. The vulnerability specifically affects the software's ability to validate configuration file integrity and enforce proper privilege separation during startup operations.
The operational impact of CVE-2018-6533 extends beyond simple privilege escalation to encompass full system compromise capabilities. Once an attacker gains root access through this vulnerability, they can execute arbitrary code with the highest system privileges, potentially leading to complete system takeover. This vulnerability directly violates fundamental security principles of least privilege and privilege separation, as outlined in the CWE-276 category for improper file permissions and access controls. The attack vector allows for persistent access to the compromised system, enabling long-term surveillance and data exfiltration activities.
Organizations running Icinga 2 versions prior to 2.8.2 face significant risk exposure due to this vulnerability, particularly in environments where monitoring systems have elevated privileges or where attackers might gain access to system configuration files. The vulnerability aligns with ATT&CK techniques related to privilege escalation and persistence, specifically targeting the execution and privilege escalation phases of the attack lifecycle. System administrators should immediately implement mitigations including upgrading to patched versions, implementing proper file access controls, and monitoring for unauthorized configuration file modifications.
The remediation strategy for CVE-2018-6533 requires immediate patching of Icinga 2 to version 2.8.2 or later, which includes proper validation of configuration file permissions and enforcement of privilege separation. Additional defensive measures should include implementing file integrity monitoring solutions to detect unauthorized changes to init.conf and other critical configuration files. Security teams should also review and enforce proper access controls for Icinga 2 configuration directories, ensuring that only authorized system administrators can modify these critical files. The vulnerability demonstrates the importance of proper privilege management and configuration file security in monitoring and security infrastructure software, aligning with industry best practices for secure system administration and operational security.