CVE-2018-14847 in MikroTik
Summary
by MITRE
MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary files and remote authenticated attackers to write arbitrary files due to a directory traversal vulnerability in the WinBox interface.
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Analysis
by VulDB Data Team • 11/07/2025
The vulnerability identified as CVE-2018-14847 represents a critical directory traversal flaw within MikroTik RouterOS versions up to 6.42, specifically affecting the WinBox interface implementation. This vulnerability exposes routers to both unauthenticated remote attackers and authenticated users with limited privileges, creating a significant security risk for network infrastructure. The WinBox interface serves as a graphical management tool that allows administrators to configure MikroTik devices remotely, making it a prime target for exploitation. The flaw stems from insufficient input validation and path sanitization within the file handling mechanisms of the WinBox protocol, enabling attackers to manipulate file system access through crafted requests.
The technical exploitation of this vulnerability leverages directory traversal techniques that allow attackers to navigate beyond the intended file system boundaries. Unauthenticated attackers can leverage this flaw to read sensitive configuration files, system logs, and potentially administrative credentials stored on the router. Authenticated attackers with lower privileges can escalate their capabilities by writing arbitrary files to the system, potentially leading to privilege escalation or persistent backdoor installation. The vulnerability exists at the application layer within the WinBox protocol implementation, where user-supplied input is not properly sanitized before being processed in file system operations. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as directory traversal or path traversal attacks.
The operational impact of CVE-2018-14847 extends beyond simple data exfiltration, as it fundamentally compromises the integrity and confidentiality of MikroTik network devices. Network administrators may unknowingly expose their entire network infrastructure to attackers who can extract sensitive information such as router configurations, user credentials, and network topology details. The vulnerability's accessibility to unauthenticated attackers means that organizations with exposed router interfaces face immediate risk without requiring any prior access credentials. This threat is particularly concerning in environments where MikroTik routers serve as critical network gateways or firewalls, as attackers could potentially manipulate routing tables, disable security features, or establish persistent access points within the network. The vulnerability also aligns with ATT&CK technique T1078 which covers valid accounts usage, as attackers can leverage legitimate administrative interfaces to maintain access and escalate privileges.
Organizations should implement immediate mitigation strategies including disabling the WinBox interface when not actively required, restricting access to the WinBox port through firewall rules, and applying the latest firmware updates from MikroTik that address this specific vulnerability. Network segmentation and monitoring of WinBox traffic can help detect anomalous file access patterns that may indicate exploitation attempts. Security teams should also conduct comprehensive network scans to identify all affected devices and ensure proper access controls are implemented. The vulnerability demonstrates the importance of proper input validation and secure coding practices, particularly when handling file system operations in network management interfaces. Organizations should consider implementing network access control lists that restrict WinBox access to trusted administrative workstations and establish regular security audits to identify and remediate similar vulnerabilities across their network infrastructure.