CVE-2024-6747 in Checkmk
Summary
by MITRE • 10/10/2024
Information leakage in mknotifyd in Checkmk before 2.3.0p18, 2.2.0p36, 2.1.0p49 and in 2.0.0p39 (EOL) allows attacker to get potentially sensitive data
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Analysis
by VulDB Data Team • 10/10/2024
The vulnerability identified as CVE-2024-6747 represents a critical information disclosure flaw within the mknotifyd component of Checkmk monitoring software. This issue affects multiple versions of the platform including the 2.3.0p18, 2.2.0p36, 2.1.0p49, and the end-of-life 2.0.0p39 releases. The vulnerability stems from inadequate access controls and data handling mechanisms within the notification daemon that processes and manages system alerts and notifications. Attackers can exploit this weakness to gain unauthorized access to potentially sensitive data that should remain protected within the monitoring infrastructure.
The technical implementation of this vulnerability involves improper input validation and insufficient sanitization of data within the mknotifyd service. When the notification daemon processes incoming requests or handles system events, it fails to properly validate the source or content of the data being processed. This allows malicious actors to craft specific requests that can trigger the exposure of internal system information, configuration details, or other sensitive operational data that would normally be restricted to authorized personnel only. The flaw operates at the application layer and can be exploited through network-based attacks without requiring elevated privileges or authentication.
The operational impact of this vulnerability extends beyond simple data exposure, as the leaked information could provide attackers with valuable insights into the monitored infrastructure. Sensitive data potentially accessible through this vulnerability may include system configurations, network topology details, service statuses, user credentials, or other operational information that could facilitate further attacks. This information leakage creates a significant risk for organizations relying on Checkmk for infrastructure monitoring, as it undermines the security posture and could enable more sophisticated attacks such as privilege escalation or targeted exploitation of other system components. The vulnerability particularly affects environments where Checkmk is deployed in production networks with sensitive data or critical infrastructure monitoring requirements.
Security mitigations for CVE-2024-6747 should prioritize immediate patching of affected Checkmk versions to the latest available releases that contain the necessary security fixes. Organizations should also implement network segmentation and access controls to limit exposure of the mknotifyd service to only trusted networks and authorized systems. Additionally, monitoring and logging should be enhanced to detect unusual patterns of access or data requests that might indicate exploitation attempts. The vulnerability aligns with CWE-200, which addresses information exposure, and represents a clear violation of the principle of least privilege as defined in security best practices. From an ATT&CK framework perspective, this vulnerability could be leveraged as part of the reconnaissance phase to gather intelligence for subsequent attack stages, specifically under the T1082 technique for system information discovery and T1566 for social engineering approaches that could benefit from the leaked information.