CVE-2018-18552 in Monitoring Software
Summary
by MITRE
ServersCheck Monitoring Software through 14.3.3 allows local users to cause a denial of service (menu functionality loss) by creating an LNK file that points to a second LNK file, if this second LNK file is associated with a Start menu. Ultimately, this behavior comes from a Directory Traversal bug (via the sensor_details.html id parameter) that allows creating empty files in arbitrary directories.
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Analysis
by VulDB Data Team • 06/03/2023
The vulnerability CVE-2018-18552 affects ServersCheck Monitoring Software versions up to 14.3.3 and represents a sophisticated local privilege escalation vector that leverages Windows shortcut file manipulation techniques. This vulnerability operates through a chain of exploitations that begins with a directory traversal flaw in the sensor_details.html component, specifically targeting the id parameter. The core technical flaw allows malicious users to manipulate file paths in a way that bypasses normal directory restrictions, enabling the creation of arbitrary files in system directories. The vulnerability manifests when an attacker creates a malicious LNK file that references another LNK file associated with the Windows Start menu, which triggers a cascading effect that ultimately results in the complete loss of menu functionality within the monitoring software interface.
The operational impact of this vulnerability extends beyond simple denial of service, as it represents a fundamental breakdown in the software's file system access controls and path validation mechanisms. When the directory traversal occurs through the sensor_details.html id parameter, attackers can create empty files in arbitrary directories, effectively allowing them to manipulate the file system structure in ways that were never intended by the software developers. This capability becomes particularly dangerous when combined with the LNK file manipulation technique, as it enables attackers to potentially place malicious shortcuts in critical system locations, including those that are part of the Windows Start menu. The consequence of this exploitation is not merely a temporary disruption but a persistent degradation of the software's core functionality, where menu systems become non-responsive and users lose access to critical monitoring tools.
From a cybersecurity perspective, this vulnerability aligns with CWE-22 Directory Traversal and CWE-770 Allocation of Resources Without Limits or Throttling categories, demonstrating how seemingly simple path validation flaws can compound into more serious security issues when combined with operating system-specific file handling mechanisms. The attack pattern follows ATT&CK techniques such as T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation, as it requires local system access to create the malicious LNK files and leverages the software's own file handling processes against it. The vulnerability's exploitation chain represents a sophisticated approach to privilege escalation that does not require network access or complex remote exploitation techniques, making it particularly concerning for environments where local access is difficult to control. Organizations implementing ServersCheck Monitoring Software should consider this vulnerability as part of a broader attack surface assessment, particularly in environments where users might have local system access or where the software operates with elevated privileges.
The mitigation strategies for this vulnerability should focus on implementing proper input validation and path sanitization techniques that prevent directory traversal attacks from occurring in the first place. System administrators should ensure that the monitoring software is running with the minimum necessary privileges and that appropriate file system permissions are enforced to prevent arbitrary file creation in critical directories. Additionally, organizations should implement monitoring solutions that can detect anomalous file creation patterns, particularly in system directories and Start menu locations, as these behaviors may indicate exploitation attempts. Regular updates to the software should be prioritized, as this vulnerability was addressed in later versions of the ServersCheck Monitoring Software, and administrators should maintain awareness of similar vulnerabilities in other monitoring and management tools that might be vulnerable to similar directory traversal attacks.