CVE-2021-44124 in HiBy OS
Summary
by MITRE • 03/28/2022
Hiby Music Hiby OS R3 Pro 1.5 and 1.6 is vulnerable to Directory Traversal. The HTTP Server does not have enough input data sanitization when shown data from SD Card, an attacker can navigate through the device's File System over HTTP.
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Analysis
by VulDB Data Team • 03/31/2022
The vulnerability identified as CVE-2021-44124 affects Hiby Music Hiby OS R3 Pro devices running firmware versions 1.5 and 1.6, representing a critical directory traversal flaw within the device's HTTP server implementation. This security weakness stems from insufficient input validation and sanitization mechanisms when processing file data retrieved from the SD card storage, creating a pathway for malicious actors to exploit the system's file access controls through HTTP requests.
The technical exploitation of this vulnerability occurs through crafted HTTP requests that manipulate directory navigation sequences, allowing attackers to traverse beyond the intended SD card boundaries and access arbitrary files on the device's file system. The flaw specifically manifests in how the HTTP server handles file path parameters, failing to properly validate or sanitize user-supplied input before processing file system operations. This inadequate sanitization creates a direct attack vector where malicious actors can construct path traversal sequences such as ../ or ..\ to move up directory levels and access protected system files, configuration data, or user information stored on the device.
From an operational impact perspective, this vulnerability compromises the device's security posture by potentially exposing sensitive data and system components that should remain isolated from remote access. Attackers could gain access to configuration files, user credentials, media library contents, and other system files that may contain proprietary information or personal data. The vulnerability affects devices running specific firmware versions, making it particularly concerning for users who have not updated their systems to patched versions, as the flaw remains exploitable in the affected releases. The remote nature of the attack means that adversaries do not require physical access to the device to exploit this weakness, significantly expanding the potential attack surface.
Security professionals should note that this vulnerability aligns with CWE-22, which specifically addresses directory traversal or path traversal attacks in software systems. The flaw demonstrates poor input validation practices that violate fundamental security principles for web application development and embedded system security. Organizations should consider implementing network segmentation and access controls to limit exposure, while users must ensure firmware updates are applied promptly. The ATT&CK framework categorizes this as a privilege escalation technique through path traversal, where adversaries leverage system weaknesses to gain unauthorized access to restricted resources. Mitigation strategies should include disabling unnecessary HTTP services, implementing proper input validation, and regularly updating firmware to address known vulnerabilities. Device manufacturers should prioritize secure coding practices and thorough security testing of network services to prevent similar issues in future releases, particularly focusing on proper sanitization of all user-supplied data before processing system-level operations.