CVE-2015-4400 in Video Doorbell
Summary
by MITRE
Ring (formerly DoorBot) video doorbells allow remote attackers to obtain sensitive information about the wireless network configuration by pressing the set up button and leveraging an API in the GainSpan Wi-Fi module.
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Analysis
by VulDB Data Team • 01/02/2020
The CVE-2015-4400 vulnerability affects Ring video doorbells that were previously known as DoorBot devices, representing a significant security flaw in consumer IoT infrastructure. This vulnerability stems from the improper handling of wireless network configuration data within the GainSpan Wi-Fi module that these devices utilize. The vulnerability specifically exploits the physical button press functionality that users employ during device setup, creating an unexpected attack vector that bypasses normal security controls. The flaw demonstrates how embedded systems in smart home devices can expose sensitive configuration information through seemingly innocuous user interaction mechanisms.
The technical implementation of this vulnerability resides in the API exposed by the GainSpan Wi-Fi module, which lacks proper access controls and authentication mechanisms. When users press the setup button, the device inadvertently exposes network configuration parameters including SSID information, security protocols, and potentially encryption keys through an unsecured API interface. This design flaw allows remote attackers to access wireless network configuration details without requiring any authentication credentials or network access. The vulnerability operates at the application layer and represents a classic case of insecure direct object reference, where the API provides access to internal system information that should be protected from external access. This weakness aligns with CWE-284, which addresses improper access control mechanisms, and demonstrates how embedded systems often lack robust security boundaries between different operational components.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with critical network configuration data that can be used for subsequent attacks. Once an attacker obtains the wireless network credentials, they can potentially gain unauthorized access to the entire home network, as the video doorbell typically operates on the same network as other connected devices. This vulnerability creates a persistent threat vector that remains active even after the initial compromise, as the exposed network information can be used for lateral movement within the network. The attack surface is particularly concerning for smart home environments where multiple IoT devices share the same network infrastructure, making this vulnerability a potential gateway for broader network infiltration.
Security mitigations for this vulnerability should focus on implementing proper access controls within the Wi-Fi module API and ensuring that network configuration data is only accessible through authenticated channels. Device manufacturers should implement secure boot processes that prevent unauthorized access to internal APIs, and network segmentation should be employed to isolate IoT devices from critical network infrastructure. The remediation process involves updating firmware to disable or secure the exposed API endpoints, implementing proper authentication mechanisms for network configuration access, and ensuring that setup processes do not inadvertently expose sensitive information. Organizations should consider implementing network monitoring to detect unusual access patterns to IoT device APIs, and the vulnerability highlights the importance of following secure coding practices as outlined in the OWASP Top Ten and NIST cybersecurity frameworks. This vulnerability serves as a critical reminder of the security challenges inherent in IoT device design and the need for comprehensive security testing throughout the development lifecycle.