Buffer Overflow in DrayTek VigorSwitch Web Interface

Executive Summary

This vulnerability is a buffer overflow in multiple DrayTek VigorSwitch models. It occurs in the webBackupAction function where repeated string concatenation of pathN, valueN, key, and option fields into fixed-size stack buffers lacks total length checks. A remote attacker with valid admin credentials can exploit this 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 with administrative access enabled. Inspect web management interfaces for unusual input handling or crashes. No specific commands are provided in the context.

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Impact Analysis

The impact includes potential denial of service attacks on affected DrayTek VigorSwitch devices and the possibility of arbitrary command execution. This could disrupt network operations and allow unauthorized access to the device's 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. A successful attack may allow arbitrary command execution, potentially leading to data breaches or unauthorized modifications to network configurations. Administrative credentials are required, but the flaw could facilitate lateral movement within a network, increasing exposure to regulatory violations.

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Mitigation Strategies

Immediately update affected DrayTek VigorSwitch devices to the latest firmware. Disable remote administrative access if not required. Restrict network access to the web management interface to trusted IPs only.

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