CVE-2019-12919 in Cylan Clever Dog Smart Camera DOG-2W
Summary
by MITRE
On Shenzhen Cylan Clever Dog Smart Camera DOG-2W and DOG-2W-V4 devices, an attacker on the local network has unauthenticated access to the internal SD card via the HTTP service on port 8000. The HTTP web server on the camera allows anyone to view or download the video archive recorded and saved on the external memory card attached to the device.
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Analysis
by VulDB Data Team • 10/07/2023
The CVE-2019-12919 vulnerability affects Shenzhen Cylan Clever Dog Smart Camera models DOG-2W and DOG-2W-V4, presenting a critical security flaw in the device's web service implementation. This vulnerability stems from inadequate authentication mechanisms within the HTTP service running on port 8000, which operates as an internal web server for accessing recorded video content stored on the device's SD card. The flaw represents a fundamental failure in the principle of least privilege, where the device exposes sensitive data without requiring any form of user authentication or authorization. The vulnerability is particularly concerning because it allows attackers with local network access to directly browse and download video archives without any credentials, effectively creating an open door for unauthorized data access.
This security weakness manifests through the device's HTTP web server implementation, which fails to enforce proper access controls for the media storage system. The camera's design appears to assume that local network access equates to authorized access, which violates core security principles and creates a significant attack surface. The vulnerability enables a wide range of malicious activities including unauthorized surveillance data theft, privacy violations, and potential exploitation for further network infiltration. The flaw is classified as a CWE-284 Access Control vulnerability, specifically representing improper access control where the system allows unauthorized users to access protected resources. From an operational security perspective, this vulnerability undermines the fundamental trust model of IoT devices, where users expect their surveillance systems to protect rather than expose their data.
The impact of this vulnerability extends beyond simple data exposure, as it provides attackers with access to potentially sensitive video recordings that may contain personal information, security footage, or other confidential data. The local network access requirement means that attackers need only be on the same network segment as the device, which is easily achievable in residential or corporate environments where network segmentation is not properly implemented. This vulnerability aligns with ATT&CK technique T1071.004 Application Layer Protocol: DNS, as it demonstrates how application-level services can be exploited to gain unauthorized access to system resources. The exposure of video archives through an unauthenticated HTTP interface creates a persistent security risk that can be exploited repeatedly without detection, making it particularly dangerous for environments where privacy and security are paramount. Organizations using these devices face significant risks including potential legal liability for privacy violations, reputational damage, and increased vulnerability to further attacks that could leverage the exposed data for social engineering or other malicious purposes.
The mitigation strategies for CVE-2019-12919 should focus on implementing proper authentication mechanisms for the HTTP service, restricting access to the port 8000 service through network segmentation, and ensuring that all IoT devices implement robust access control policies. Device manufacturers should enforce secure default configurations that disable unnecessary services, implement strong authentication requirements for all administrative and data access points, and ensure proper network isolation for IoT devices. Network administrators should implement firewall rules to restrict access to port 8000 to authorized users only, deploy network monitoring solutions to detect unauthorized access attempts, and regularly audit device configurations to ensure compliance with security best practices. Additionally, users should be advised to change default passwords, disable unnecessary services, and implement proper network segmentation to limit the potential impact of such vulnerabilities. The vulnerability serves as a reminder of the critical importance of secure-by-design principles in IoT device development and the necessity of implementing proper access controls even for internal services.