Buffer Overflow in DrayTek VigorSwitch via sysreboot

Executive Summary

This is a buffer overflow vulnerability in multiple DrayTek VigorSwitch models. It occurs in the sysreboot function due to unsafe concatenation of split valueN data into a fixed-size buffer. An attacker with admin credentials can exploit this by sending crafted input to cause a denial of service or execute arbitrary commands.

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Detection Guidance

Detecting this vulnerability requires checking for affected DrayTek VigorSwitch models running outdated firmware. Inspect device models and firmware versions against DrayTek's advisory. Network scanning tools like Nmap can identify vulnerable devices by querying their web management interface.

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Impact Analysis

If exploited, this vulnerability could allow an attacker to crash the device (denial of service) or run arbitrary commands with administrative privileges. This could disrupt network operations or provide unauthorized access to the device.

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Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by enabling unauthorized access to network devices. Exploitation may lead to data breaches, unauthorized command execution, or service disruption, which are critical violations under these regulations. Administrative access requirements for exploitation do not reduce the compliance risk if credentials are compromised.

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Mitigation Strategies

Immediately update affected DrayTek VigorSwitch devices to the latest firmware versions specified in DrayTek's security advisory. Restrict administrative access to the web management interface to trusted users only.

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