CVE-2023-7004 identifies a vulnerability in the Sciener TTLock App version 6.4.5, categorized under CWE-319 (Cleartext Transmission of Sensitive Information) and CWE-940 (Improper Verification of Device Authenticity). The core issue lies in the app's failure to properly verify that it is communicating with the legitimate lock device. Specifically, the app accepts connections from devices that spoof the MAC address of a genuine lock, allowing an attacker to impersonate the lock. This flaw leads to the transmission of sensitive information in cleartext, exposing it to interception or manipulation by an adversary within network range. The vulnerability does not require user interaction or privileges, but the attacker must be within the network proximity (e.g., Bluetooth or local Wi-Fi). Although no exploits are currently known in the wild, the vulnerability could allow attackers to undermine the integrity of the lock system by intercepting commands or injecting malicious data. This compromises the physical security guarantees provided by the TTLock system, potentially enabling unauthorized access to secured premises. The CVSS v3.1 score of 6.5 reflects a medium severity, with high confidentiality impact but no direct impact on integrity or availability. The vulnerability highlights the importance of robust device authentication and encrypted communication channels in IoT security, especially for smart lock applications.

For European organizations, the vulnerability poses a significant risk to physical security where TTLock smart locks are deployed, such as in office buildings, residential complexes, hotels, and co-working spaces. Attackers exploiting this flaw could impersonate legitimate locks, intercept sensitive communication, or potentially unlock doors without authorization, leading to unauthorized physical access. This could result in theft, data breaches, or disruption of business operations. The cleartext transmission of sensitive information also raises privacy concerns and could facilitate further attacks on connected systems. Given the increasing adoption of IoT devices across Europe, the vulnerability could undermine trust in smart lock technologies and complicate compliance with data protection regulations like GDPR if personal data or access logs are exposed. The medium severity score indicates that while the threat is serious, it is somewhat mitigated by the requirement for network proximity and the absence of known exploits. However, organizations relying on TTLock systems should consider this vulnerability a priority for risk assessment and remediation.

1. Monitor Sciener’s official channels for security patches addressing CVE-2023-7004 and apply updates to the TTLock App promptly once available. 2. Until patches are released, restrict network access to TTLock devices by implementing network segmentation and isolating IoT devices from general user networks. 3. Employ Bluetooth and Wi-Fi security best practices, such as disabling unnecessary wireless interfaces and using strong encryption and authentication mechanisms where possible. 4. Conduct regular audits of connected devices to detect unauthorized or spoofed MAC addresses attempting to communicate with TTLock systems. 5. Educate users and administrators about the risks of connecting to unknown devices and encourage vigilance regarding unexpected lock behavior. 6. Consider deploying additional physical security controls or multi-factor authentication mechanisms for critical access points to reduce reliance on the app alone. 7. Collaborate with vendors to encourage implementation of cryptographic device authentication and encrypted communication channels in future product versions.