CVE-2017-2917 in Circle with Disney
Summary
by MITRE
An exploitable vulnerability exists in the notifications functionality of Circle with Disney running firmware 2.0.1. Specially crafted network packets can cause an OS command injection. An attacker can send an HTTP request to trigger this vulnerability.
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Analysis
by VulDB Data Team • 01/06/2023
The vulnerability identified as CVE-2017-2917 represents a critical command injection flaw within the Circle with Disney security camera system's notification handling mechanism. This issue affects devices running firmware version 2.0.1 and demonstrates a fundamental failure in input validation and sanitization within the device's web interface. The vulnerability resides in how the system processes notification-related HTTP requests, specifically when handling user-supplied data in the notification configuration parameters. Attackers can exploit this weakness by crafting malicious network packets that contain specially formatted commands, which then get executed within the operating system context of the device.
The technical exploitation of this vulnerability follows a classic command injection pattern where user-controllable input is improperly integrated into system commands without adequate sanitization or escaping mechanisms. When the Circle with Disney device processes an HTTP request containing malicious input within notification parameters, the system fails to properly validate or escape the input before incorporating it into OS-level commands. This allows attackers to inject arbitrary commands that execute with the privileges of the web server process, typically running with elevated permissions on the device. The vulnerability specifically affects the notification functionality, which suggests that the device's web interface includes mechanisms for configuring external notification services, potentially including email, SMS, or webhook integrations that could be exploited to execute arbitrary code.
From an operational perspective, this vulnerability presents a severe security risk for users of the Circle with Disney security cameras, as it allows remote attackers to gain arbitrary code execution capabilities on the affected devices. The impact extends beyond simple command injection to potentially enable full system compromise, including the ability to access stored video footage, modify device configuration, install malicious software, or use the device as a pivot point for attacking other systems on the local network. The remote attack vector means that exploitation can occur without physical access to the device, making it particularly dangerous for home and commercial security deployments where these devices are often placed in unsecured environments. The vulnerability also demonstrates poor security practices in API design and input handling that could affect similar IoT devices with comparable notification systems.
The security implications of this vulnerability align with CWE-77 and CWE-78 classifications, which specifically address command injection flaws in software systems. These weaknesses fall under the ATT&CK technique T1059.001 for Command and Scripting Interpreter, where adversaries execute commands on compromised systems. Mitigation strategies should include immediate firmware updates from Circle to address the specific validation issues in the notification handling code. Organizations should also implement network segmentation to limit access to these devices, disable unnecessary notification services when not required, and monitor network traffic for suspicious HTTP requests containing unusual command patterns. Additionally, network administrators should consider implementing web application firewalls to detect and block malicious payloads attempting to exploit similar command injection vulnerabilities. The vulnerability underscores the critical importance of validating and sanitizing all user inputs in web applications and highlights the need for robust security testing of IoT device firmware before deployment in production environments.