Inaba Denki Sangyo CHOCO TEI WATCHER Mini: A Compact Timepiece Review

Inaba Denki Sangyo CHOCO TEI WATCHER Mini: A Comprehensive Vulnerability Analysis

1. EXECUTIVE SUMMARY

The Inaba Denki Sangyo CHOCO TEI WATCHER Mini has been identified as having several critical vulnerabilities that pose significant security risks. With a CVSS v4 score of 9.3, these vulnerabilities can be exploited remotely with low attack complexity, making them particularly concerning for users. The vulnerabilities include issues related to client-side authentication, password storage, weak password requirements, and forced browsing, all of which could allow unauthorized access and manipulation of the device’s data and settings. This report aims to provide a detailed analysis of these vulnerabilities, their implications, and recommended mitigations.

2. RISK EVALUATION

The successful exploitation of the identified vulnerabilities could lead to severe consequences, including:

• Unauthorized Access: Attackers could gain access to the product’s login credentials.
• Data Tampering: Once inside, attackers could alter or delete critical data.
• Configuration Changes: Attackers could modify settings, potentially leading to further vulnerabilities or operational disruptions.

Given the potential for significant impact, organizations using the CHOCO TEI WATCHER Mini must take these vulnerabilities seriously and implement appropriate security measures.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The CHOCO TEI WATCHER Mini (model IB-MCT001) is affected across all versions, indicating a widespread risk for all users of this device.

3.2 VULNERABILITY OVERVIEW

3.2.1 USE OF CLIENT-SIDE AUTHENTICATION (CWE-603)

This vulnerability allows attackers to bypass authentication mechanisms, potentially leading to unauthorized access to the device. The associated CVE-2025-24517 has a CVSS v4 score of 8.7, indicating a high severity level.

3.2.2 STORING PASSWORDS IN A RECOVERABLE FORMAT (CWE-257)

Passwords stored on the microSD card can be easily accessed by attackers, leading to unauthorized access. The CVE-2025-24852 has a CVSS v4 score of 5.1, which, while lower than other vulnerabilities, still represents a significant risk.

3.2.3 WEAK PASSWORD REQUIREMENTS (CWE-521)

The device’s weak password policies make it susceptible to brute-force attacks. The CVE-2025-25211 has a CVSS v4 score of 9.3, highlighting the critical nature of this vulnerability.

3.2.4 DIRECT REQUEST (‘FORCED BROWSING’) (CWE-425)

This vulnerability allows attackers to manipulate HTTP requests to access or alter device data. The CVE-2025-26689 has a CVSS v4 score of 9.3, indicating a severe risk of data compromise.

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: The CHOCO TEI WATCHER Mini is utilized in critical manufacturing sectors, making its security paramount.
• COUNTRIES/AREAS DEPLOYED: The device is deployed worldwide, increasing the potential attack surface.
• COMPANY HEADQUARTERS LOCATION: Inaba Denki Sangyo Co., Ltd. is headquartered in Japan.

3.4 RESEARCHER

The vulnerabilities were reported by Andrea Palanca of Nozomi Networks, with coordination from JPCERT/CC and CISA, highlighting the collaborative effort in identifying and addressing these security issues.

4. MITIGATIONS

Inaba Denki Sangyo Co., Ltd. has recommended several mitigations to help users protect their devices:

• Network Restrictions: Use the product within a local area network (LAN) and block access from untrusted networks through firewalls.
• Access Control: Implement firewalls or VPNs to restrict unauthorized access, especially when internet connectivity is required.
• User Authorization: Limit product operation and handling of microSD cards to authorized personnel only.

For further guidance, users can refer to the security advisories provided by CISA and Inaba Denki Sangyo Co., Ltd.

5. UPDATE HISTORY

• March 25, 2025: Initial publication of vulnerability details and recommendations.

CONCLUSION

The vulnerabilities identified in the Inaba Denki Sangyo CHOCO TEI WATCHER Mini present significant risks that could lead to unauthorized access and data manipulation. Organizations utilizing this device must take immediate action to implement the recommended mitigations and stay informed about potential threats. By prioritizing cybersecurity measures, users can better protect their critical infrastructure and sensitive data from exploitation.