CVE-2019-5271 in Myna
Summary
by MITRE
There is an information leak vulnerability in Huawei smart speaker Myna. When the smart speaker is paired with the cloud through Wi-Fi, the speaker incorrectly processes some data. Attackers can exploit this vulnerability to read and modify specific configurations of speakers through a series of operations.
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Analysis
by VulDB Data Team • 03/05/2024
The vulnerability identified as CVE-2019-5271 represents a critical information disclosure flaw within Huawei's smart speaker Myna device, which operates as part of the broader IoT ecosystem. This vulnerability manifests during the Wi-Fi cloud pairing process, where the device fails to properly validate or sanitize incoming data streams, creating an exploitable condition that allows unauthorized access to sensitive device configurations. The flaw specifically affects the device's data processing mechanisms when establishing cloud connectivity, indicating a fundamental weakness in the device's input validation and data handling protocols.
The technical implementation of this vulnerability stems from inadequate data sanitization within the device's communication stack, particularly during the initial pairing phase with Huawei's cloud services. When the smart speaker attempts to establish secure communication with the cloud infrastructure, malformed or specially crafted data packets can bypass normal validation checks, allowing attackers to manipulate the device's internal configuration parameters. This represents a classic example of insufficient input validation, which maps directly to CWE-20 - Improper Input Validation, and falls under the broader category of configuration management vulnerabilities that affect IoT devices. The vulnerability's exploitation requires a series of coordinated operations that leverage the device's trust relationship with the cloud infrastructure, making it particularly dangerous as it can be executed without physical access to the device.
The operational impact of CVE-2019-5271 extends beyond simple information disclosure, as it enables attackers to modify specific configurations of the smart speaker, potentially compromising the entire device ecosystem. This configuration modification capability could allow adversaries to alter the device's network settings, disable security features, or redirect the device to malicious endpoints, effectively giving them persistent control over the device's operations. The vulnerability's presence in a smart speaker device creates additional security implications since these devices often serve as entry points for broader network infiltration attempts, aligning with ATT&CK technique T1071.004 for application layer protocol usage. The compromised device could then be used as a pivot point for attacking other networked devices or serving as a persistent backdoor for ongoing surveillance activities.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from Huawei, which would address the underlying data processing flaws and implement proper input validation mechanisms. Network segmentation and monitoring of device communication patterns can help detect anomalous behavior that might indicate exploitation attempts. Organizations should also implement device integrity checking mechanisms and consider deploying network access control lists to restrict communication between IoT devices and cloud services. The vulnerability highlights the critical importance of secure device provisioning processes and proper input validation in IoT devices, as outlined in industry standards such as NIST SP 800-125 for IoT security considerations. Regular security assessments of IoT device configurations and network monitoring should be implemented to detect similar vulnerabilities in other connected devices within the enterprise environment.