CVE-2018-13332 in TerraMaster TOS
Summary
by MITRE
Directory Traversal in the explorer application in TerraMaster TOS version 3.1.03 allows attackers to upload files to arbitrary locations via the "path" URL parameter.
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Analysis
by VulDB Data Team • 04/15/2020
The vulnerability identified as CVE-2018-13332 represents a critical directory traversal flaw within the explorer application component of TerraMaster TOS version 3.1.03 operating system. This weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied path parameters, creating an exploitable condition where malicious actors can manipulate file upload operations to target arbitrary directories on the affected system. The vulnerability specifically manifests through the "path" URL parameter which controls the destination directory for file uploads, allowing attackers to bypass intended access controls and execute unauthorized file placement operations. Such a flaw fundamentally undermines the security boundaries established by the operating system's file management interfaces.
The technical exploitation of this vulnerability leverages the absence of proper path validation and normalization routines within the TerraMaster TOS explorer application. When an attacker submits a crafted URL containing a malicious path parameter, the application processes this input without adequate sanitization, enabling the inclusion of directory traversal sequences such as "../" or similar constructs. This allows the system to interpret the intended upload destination as a location outside the originally designated directory structure, effectively granting attackers the ability to write files to any location where the application process has write permissions. The flaw operates at the application layer and directly impacts the integrity of the file system's access controls, as the vulnerability exists in the core file management functionality rather than in network protocols or lower-level system components.
The operational impact of CVE-2018-13332 extends beyond simple unauthorized file placement, as it creates a potential vector for more sophisticated attacks including remote code execution through malicious file uploads. Attackers can leverage this vulnerability to upload web shells, malicious scripts, or other payload files that can be executed by the web server or application processes running on the TerraMaster TOS system. This capability transforms the vulnerability from a mere directory traversal issue into a potential full system compromise scenario, as the attacker can establish persistent access and potentially escalate privileges within the affected environment. The vulnerability affects the confidentiality, integrity, and availability of the system's stored data and services, creating risks for data loss, unauthorized access, and system disruption. The impact is particularly severe in network-attached storage environments where such systems often contain sensitive organizational data and may serve as entry points for broader network infiltration attempts.
Organizations utilizing TerraMaster TOS version 3.1.03 should implement immediate mitigations including applying the vendor-provided security patches or updates that address the directory traversal vulnerability. Network segmentation and access control measures should be strengthened to limit the exposure of the vulnerable explorer application to untrusted networks or users. Input validation mechanisms should be enhanced to properly sanitize all path parameters and reject any input containing directory traversal sequences. Additionally, the principle of least privilege should be enforced by ensuring that the application process runs with minimal necessary permissions and that file upload capabilities are restricted to authorized users only. This vulnerability aligns with CWE-22 Directory Traversal and represents a significant concern under the ATT&CK framework category of Persistence and Privilege Escalation, as it provides attackers with the foundational capability to establish persistent access to affected systems. Regular security audits and vulnerability assessments should be conducted to identify and remediate similar issues in other components of the system.