Buffer Overflow in DrayTek VigorSwitch via SMTP Email Handling

Executive Summary

This is a buffer overflow vulnerability in multiple DrayTek VigorSwitch models. It occurs in the mail_mailalert function where the system combines multiple SMTP email addresses into a fixed-size buffer without checking available space. This can lead to a buffer overflow if the combined input exceeds the buffer size.

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Detection Guidance

To detect this vulnerability, check if your DrayTek VigorSwitch models are running vulnerable firmware versions. Review the device's web management interface for any unusual SMTP email configurations or crashes. Monitor network traffic for repeated administrative login attempts or unexpected command executions.

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Impact Analysis

An attacker with valid admin credentials for the device's web interface could exploit this to cause a denial of service or execute arbitrary commands on the affected device. This could disrupt network operations or allow unauthorized access to the switch.

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Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by enabling unauthorized access to network devices. A buffer overflow may allow attackers to execute arbitrary commands, potentially leading to data breaches or unauthorized system modifications. Administrative access is required, but successful exploitation could compromise device integrity and data confidentiality.

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Mitigation Strategies

Immediately update the firmware of all affected DrayTek VigorSwitch models to the latest patched version. Disable unnecessary administrative access to the web interface and restrict SMTP email configurations to trusted sources only.

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