CVE-2022-31258 in Checkmk
Summary
by MITRE • 05/21/2022
In Checkmk before 1.6.0p29, 2.x before 2.0.0p25, and 2.1.x before 2.1.0b10, a site user can escalate to root by editing an OMD hook symlink.
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Analysis
by VulDB Data Team • 07/24/2024
The vulnerability identified as CVE-2022-31258 represents a critical privilege escalation flaw within the Checkmk monitoring platform that affects multiple version streams including 1.6.0p29, 2.0.0p25, and 2.1.0b10. This security weakness stems from inadequate permission controls during the handling of OMD hook symlinks, which are symbolic links used to customize and extend the functionality of Checkmk sites. The flaw allows authenticated site users to elevate their privileges from standard user level to root access, fundamentally compromising the system's security model. The vulnerability operates through a path traversal mechanism where malicious users can manipulate symbolic links to gain unauthorized access to system resources that should remain restricted.
Technical exploitation of this vulnerability involves the manipulation of OMD hook symlinks which are typically used to inject custom scripts or modify system behavior within Checkmk environments. When users with site-level permissions edit these symlinks without proper validation, they can create or modify symbolic links that point to privileged system files or directories. This process directly violates the principle of least privilege and allows attackers to bypass normal access controls. The underlying flaw demonstrates poor input sanitization and insufficient access control mechanisms that should prevent regular users from modifying system-critical symbolic link configurations. This type of vulnerability maps to CWE-276, which specifically addresses incorrect permissions for critical resources, and represents a classic case of insufficient access control in multi-tenant monitoring environments.
The operational impact of CVE-2022-31258 extends beyond simple privilege escalation to encompass complete system compromise and potential data exfiltration. Once an attacker achieves root access through this vulnerability, they can modify system configurations, install persistent backdoors, access all monitored services and their associated credentials, and potentially use the compromised system as a pivot point for attacking other networked systems. The attack vector aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation', and T1548.001, focusing on 'Abuse Elevation Control Mechanism'. Organizations running affected Checkmk versions face significant risk of unauthorized system access, especially in environments where monitoring platforms are exposed to untrusted users or where administrative privileges are not properly isolated from regular user accounts. The vulnerability is particularly concerning in enterprise environments where Checkmk is used for critical infrastructure monitoring and where a single compromised user account could lead to widespread system compromise.
Mitigation strategies for CVE-2022-31258 require immediate implementation of the vendor-provided patches for all affected versions including the specific releases mentioned in the CVE description. Organizations should also implement strict access control policies that limit the ability of regular users to modify system-level configurations and symbolic links. Network segmentation and the principle of least privilege should be enforced to prevent unauthorized access to monitoring systems. Additionally, implementing monitoring solutions that can detect suspicious symlink modifications and unauthorized privilege escalation attempts provides an additional layer of defense. Security teams should conduct comprehensive audits of all Checkmk installations to identify and remediate any custom configurations that may have introduced additional attack vectors. The vulnerability highlights the importance of regular security updates and proper configuration management in monitoring platforms, particularly those handling sensitive infrastructure data. Organizations should also consider implementing automated patch management processes to ensure timely deployment of security fixes and maintain detailed audit logs of all system configuration changes.