Buffer Overflow in DrayTek VigorAP Web Interface

Executive Summary

Multiple DrayTek VigorAP models have a buffer overflow vulnerability in the setLan function due to missing length checks when copying data for lanVlanId0, lanIp, and lanNetmask fields. A remote attacker with valid admin credentials can exploit this to cause a denial of service or run arbitrary commands.

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Detection Guidance

Detecting this vulnerability requires checking DrayTek VigorAP devices for the affected models and firmware versions. Use network scanning tools like Nmap to identify VigorAP devices on your network. Log in to the device's web management interface and verify the firmware version. If the device is running a vulnerable version, it may be susceptible to buffer overflow via crafted input in the setLan function.

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Impact Analysis

This vulnerability allows an attacker to crash the device or execute arbitrary commands, potentially leading to loss of network access or unauthorized control of the device. Exploitation requires administrative access to the web management interface.

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Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by enabling unauthorized access to network devices if exploited. Buffer overflows may allow attackers to execute arbitrary commands, potentially leading to data breaches or unauthorized system modifications. Administrative credentials are required, but successful exploitation could compromise network integrity and data confidentiality.

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Mitigation Strategies

Immediately update the firmware of all DrayTek VigorAP devices to the latest patched version. Ensure administrative credentials for the web management interface are strong and not shared. Disable remote administration if not required. Monitor network traffic for unusual activity targeting the setLan function or related parameters.

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