Buffer Overflow in DrayTek VigorSwitch via pingtrace Function

Executive Summary

This is a buffer overflow vulnerability in multiple DrayTek VigorSwitch models. It occurs in the pingtrace function due to missing length checks when combining host, count, and interval fields into a fixed-size buffer. A remote attacker with admin credentials can exploit this to cause a denial of service or run arbitrary commands.

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Detection Guidance

Detect this vulnerability by checking if any DrayTek VigorSwitch models are running firmware versions below the specified thresholds. Inspect the web management interface for unusual activity in the pingtrace function or buffer overflow indicators.

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Impact Analysis

An attacker could disrupt network operations by crashing the device or take control of it to execute malicious commands. This requires valid admin access to the web interface, limiting direct exposure but posing serious risks if credentials are compromised.

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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 access is required, but successful exploitation could compromise network integrity and data confidentiality.

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Mitigation Strategies

Immediately update affected DrayTek VigorSwitch models to the latest firmware versions that address the buffer overflow vulnerability. Ensure administrative credentials for the web management interface are strong and not shared.

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