EUVD-2025-199000

Comprehensive Technical Analysis of EUVD-2025-199000

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-199000 pertains to the NVMS-9000 firmware used in various DVR/NVR/IPC products by Shenzhen TVT Digital Technology Co., Ltd. The primary issues are hardcoded API credentials and an OS command injection flaw in the configuration services. The severity of this vulnerability is rated with a CVSS Base Score of 9.3, indicating a critical risk. The CVSS vector (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) highlights the following:

• Attack Vector (AV:N): Network, meaning the vulnerability is exploitable remotely.
• Attack Complexity (AC:L): Low, indicating that the attack is relatively straightforward to execute.
• Privileges Required (PR:N): None, meaning no authentication is required to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is needed for the attack to succeed.
• Confidentiality (VC:H), Integrity (VI:H), and Availability (VA:H): All high, indicating significant impact on all three security aspects.

2. Potential Attack Vectors and Exploitation Methods

The vulnerability can be exploited through several attack vectors:

• Web/API Interface: An attacker can send HTTP/XML requests authenticated with the hardcoded vendor credential string to endpoints like /editBlackAndWhiteList. By injecting shell metacharacters into XML parameters, the attacker can execute arbitrary commands as root.
• Proprietary TCP Service: Some models expose a proprietary TCP service on port 4567, which accepts a magic GUID preface and base64-encoded XML. This service can also be exploited for command injection.

Exploitation methods include:

• Command Injection: By crafting malicious XML payloads, an attacker can inject commands that are executed with root privileges.
• Unauthenticated Access: The hardcoded credentials allow unauthenticated access, making it easier for attackers to exploit the vulnerability.

3. Affected Systems and Software Versions

The vulnerability affects NVMS-9000 firmware versions prior to mid-February 2018. This firmware is used in various white-labeled DVR/NVR/IPC products, making the impact widespread across different brands and models.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Firmware Update: Ensure that all affected devices are updated to firmware versions released after mid-February 2018, which address the vulnerability.
• Network Segmentation: Isolate affected devices on separate network segments to limit exposure to potential attackers.
• Access Control: Implement strict access controls and firewall rules to restrict access to the vulnerable endpoints and services.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect any suspicious activity or unauthorized access attempts.
• Credential Management: Regularly update and manage credentials to avoid the use of hardcoded or default credentials.

5. Impact on European Cybersecurity Landscape

The widespread use of the affected firmware in various white-labeled products poses a significant risk to European cybersecurity. Organizations and individuals using these devices are at risk of unauthorized access, data breaches, and potential takeover of their surveillance systems. This vulnerability underscores the importance of supply chain security and the need for robust vulnerability management practices.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Hardcoded Credentials: The firmware contains hardcoded API credentials, which can be used by attackers to authenticate and access sensitive endpoints.
• Command Injection: The configuration services do not properly sanitize user-controlled fields, allowing for command injection. Attackers can inject shell metacharacters into XML parameters to execute arbitrary commands.
• Proprietary TCP Service: Some models expose a proprietary TCP service on port 4567, which can be exploited in a similar manner to the web/API interface.
• Exploitation Evidence: The Shadowserver Foundation observed exploitation evidence on 2025-01-28 UTC, indicating active exploitation in the wild.

References:

• NVD CVE-2018-25126
• Juniper Threat Research
• GitHub PoC
• Seebug Vulnerability Database
• VulnCheck Advisory

By addressing these vulnerabilities and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their surveillance systems from unauthorized access and command injection attacks.