CVE-2018-11631 in M1 Wristband Smart Band 1
Summary
by MITRE
Rondaful M1 Wristband Smart Band 1 devices allow remote attackers to send an arbitrary number of call or SMS notifications via crafted Bluetooth Low Energy (BLE) traffic.
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Analysis
by VulDB Data Team • 02/10/2020
The vulnerability identified as CVE-2018-11631 affects Rondaful M1 Wristband Smart Band 1 devices, representing a significant security flaw in IoT wearable technology that enables unauthorized remote exploitation through Bluetooth Low Energy communication channels. This issue resides within the device's Bluetooth stack implementation where insufficient input validation and access control mechanisms fail to properly authenticate and sanitize incoming BLE traffic. The flaw specifically manifests when the smart band processes crafted BLE packets that contain malicious notification payloads, allowing attackers to flood the device with arbitrary call or SMS notifications without requiring physical access or legitimate user credentials.
The technical implementation of this vulnerability stems from inadequate bounds checking and parameter validation within the BLE communication protocol handler of the smart band's firmware. When the device receives BLE packets containing notification data, it fails to verify the authenticity of the source or validate the content of the notification parameters. This absence of proper cryptographic authentication and input sanitization creates a pathway for remote attackers to manipulate the device's notification system through specially crafted BLE advertisements or connection requests. The vulnerability operates at the application layer of the BLE stack, where notification delivery mechanisms lack proper access controls and payload validation, making it susceptible to abuse through crafted malicious traffic patterns that can be transmitted from any location within BLE range.
From an operational perspective, this vulnerability presents a substantial risk to user privacy and device functionality within the context of IoT security. The ability to send unlimited notification spam creates potential for both privacy violations and denial-of-service conditions that could render the device unusable for legitimate purposes. Attackers can exploit this flaw to overwhelm the device with repetitive notifications, potentially causing the display to become flooded with messages that prevent normal operation. The impact extends beyond simple annoyance as these notifications could contain malicious content or be used as part of larger attack campaigns targeting the device owner's smartphone or other connected systems. The vulnerability also raises concerns about the device's potential use in coordinated attacks where multiple compromised devices could be used to amplify notification spam across a network of connected IoT devices.
Security professionals should consider this vulnerability in relation to CWE-20, which addresses "Improper Input Validation," and CWE-310, which covers "Cryptographic Issues," as the flaw involves both insufficient validation of incoming BLE traffic and lack of proper authentication mechanisms. The attack vector aligns with ATT&CK technique T1059.006, "Command and Scripting Interpreter: PowerShell", though adapted for BLE communication, and T1499.004, "Network Denial of Service", as it enables the flooding of notification systems. Mitigation strategies should focus on implementing proper BLE traffic filtering at the network level, firmware updates that include input validation and authentication mechanisms, and network segmentation to limit the scope of potential exploitation. Organizations should also consider deploying BLE monitoring solutions that can detect anomalous notification traffic patterns and implement device-specific access controls that require proper authentication before allowing notification configuration changes. The vulnerability highlights the critical importance of secure IoT device design and the necessity of implementing robust security controls even in seemingly simple wearable devices that connect to mobile networks and other IoT ecosystems.