EUVD-2024-36212

Comprehensive Technical Analysis of EUVD-2024-36212

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-36212 affects the TOTOLINK LR350 router, specifically version V9.3.5u.6369_B20220309. The issue is a command injection vulnerability in the NTPSyncWithHost function via the host_time parameter. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability affects the same security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The command injection vulnerability can be exploited by sending specially crafted network packets to the NTPSyncWithHost function. An attacker could inject malicious commands through the host_time parameter, leading to arbitrary command execution on the affected device. Potential attack vectors include:

• Remote Command Execution: An attacker can execute arbitrary commands on the router, potentially leading to full control over the device.
• Data Exfiltration: Sensitive information can be exfiltrated by executing commands that read and transmit data.
• Denial of Service (DoS): The attacker can disrupt the normal operation of the router, causing a denial of service.

3. Affected Systems and Software Versions

The vulnerability specifically affects the TOTOLINK LR350 router running firmware version V9.3.5u.6369_B20220309. Other versions of the firmware and other TOTOLINK devices may also be affected, but this has not been confirmed.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to a version that addresses this vulnerability. If an update is not available, contact the vendor for a patch.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity and potential exploitation attempts.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected TOTOLINK LR350 routers. The potential for remote command execution and data exfiltration can lead to severe consequences, including:

• Data Breaches: Sensitive information can be compromised, leading to data breaches and potential regulatory violations.
• Service Disruptions: Critical services relying on the affected routers can be disrupted, impacting business operations.
• Reputation Damage: Organizations may suffer reputational damage if they are found to be using vulnerable devices.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The NTPSyncWithHost function is vulnerable to command injection via the host_time parameter.
• Exploitation: The vulnerability can be exploited by sending specially crafted network packets to the router. The attacker can inject malicious commands, leading to arbitrary command execution.
• Detection: Monitor network traffic for unusual patterns or commands being sent to the router. Implement logging and alerting mechanisms to detect potential exploitation attempts.
• Patching: Ensure that the router's firmware is updated to the latest version that addresses this vulnerability. If a patch is not available, consider implementing workarounds such as disabling the NTP synchronization feature until a fix is released.

Conclusion

The command injection vulnerability in the TOTOLINK LR350 router (EUVD-2024-36212) is a critical issue that requires immediate attention. Organizations and individuals using the affected devices should prioritize firmware updates and implement robust security measures to mitigate the risk. Continuous monitoring and regular security assessments are essential to maintain a strong cybersecurity posture.

References

• GitHub Vulnerability Report
• CVE ID: CVE-2024-36783
• Assigner: Mitre
• EPSS: 2
• ENISA ID Product: [{"id":"7ad47c1b-6118-3b8f-bf42-53485fc6e370","product":{"name":"n/a"},"product_version":"n/a"}]
• ENISA ID Vendor: [{"id":"f921d7de-b6f6-31b1-9bcc-016be562fa3e","vendor":{"name":"n/a"}}]