Command Injection in DrayTek VigorSwitch

Executive Summary

This is an OS command injection vulnerability in multiple DrayTek VigorSwitch models. It exists in the fdftDevice function due to insufficient filtering of username and password fields. A remote attacker with valid admin credentials can exploit this to execute arbitrary commands with root privileges.

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Detection Guidance

To detect this vulnerability, check if any DrayTek VigorSwitch models are running vulnerable firmware versions. Inspect web management interface login fields for improper input validation. Use network scanning tools to identify affected devices by their model and version numbers.

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Impact Analysis

An attacker could take full control of the affected device, modify configurations, intercept network traffic, or use it as a pivot point to attack other systems on the network. This could lead to data breaches, service disruption, or unauthorized access to sensitive information.

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Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations using affected devices may face compliance violations, legal penalties, and reputational damage if exploited.

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Mitigation Strategies

Immediately update affected DrayTek VigorSwitch devices to the latest firmware provided by DrayTek. Disable remote administrative access if not required. Implement network segmentation to limit exposure of vulnerable devices. Monitor for unusual command execution patterns in system logs.

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