CVE-2018-18472 in WD My Book Live
Summary
by MITRE
Western Digital WD My Book Live (all versions) has a root Remote Command Execution bug via shell metacharacters in the /api/1.0/rest/language_configuration language parameter. It can be triggered by anyone who knows the IP address of the affected device.
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Analysis
by VulDB Data Team • 10/06/2023
The vulnerability CVE-2018-18472 represents a critical remote command execution flaw in Western Digital WD My Book Live network-attached storage devices across all versions. This vulnerability exists within the web interface's REST API endpoint at /api/1.0/rest/language_configuration where the language parameter fails to properly sanitize user input, creating an injection vector that allows arbitrary command execution with root privileges. The flaw stems from inadequate input validation and sanitization practices that permit shell metacharacters to be interpreted and executed by the underlying operating system.
The technical implementation of this vulnerability leverages the device's web server to process API requests without proper sanitization of the language parameter, which is typically used for localization purposes. When an attacker crafts a malicious payload containing shell metacharacters such as semicolons, pipes, or command substitution operators, these characters are passed directly to the system shell without proper escaping or filtering. This creates a classic command injection vulnerability that operates at the highest privilege level, as the web server process runs with root permissions. The vulnerability aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and represents a direct violation of secure coding practices for input validation.
The operational impact of this vulnerability is severe and far-reaching, as it enables any remote attacker with knowledge of the device's IP address to execute arbitrary commands with full system privileges. This compromise allows attackers to gain complete control over the storage device, potentially leading to data exfiltration, system modification, or use of the device as a pivot point for attacking other systems within the network. The vulnerability affects all versions of the WD My Book Live device, making it particularly concerning as many users may not have updated their systems, and the attack surface remains broad due to the device's typical deployment in home and small office environments where network exposure is common. The accessibility of this vulnerability through the standard network interface means that automated scanning tools can identify and exploit vulnerable devices without requiring authentication or specialized attack capabilities.
Mitigation strategies should focus on immediate network segmentation and access control measures, as the vulnerability is trivial to exploit from the network level. Network administrators should implement firewall rules to restrict access to the device's web interface and API endpoints, particularly blocking external access to ports commonly used by the device. The most effective long-term solution involves applying vendor patches if available, though this may not be feasible for older devices that are no longer supported. Organizations should also consider implementing network monitoring to detect unusual traffic patterns that might indicate exploitation attempts, and should regularly audit their network-attached storage configurations for similar vulnerabilities. This vulnerability demonstrates the importance of secure input handling and proper privilege separation in embedded systems, and aligns with ATT&CK technique T1059.001 for command and script injection, highlighting the need for comprehensive security testing of network services.