Executive Summary

This vulnerability is a buffer overflow in the speed_dir parameter within the SetSpeedWan function of the Tenda AC6 V2.0 15.03.06.50 firmware. A buffer overflow occurs when more data is written to a buffer than it can hold, which can cause unexpected behavior or crashes. In this case, an attacker can send specially crafted input to trigger the overflow.

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Impact Analysis

This vulnerability can allow an attacker to cause a Denial of Service (DoS) on the affected device by exploiting the buffer overflow with crafted input, potentially making the device unavailable or unstable.

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Detection Guidance

Detection of this vulnerability involves monitoring for unusual crashes or Denial of Service symptoms related to the Tenda AC6 router, specifically triggered by malformed inputs to the speed_dir parameter in the SetSpeedWan function. Since this is a buffer overflow triggered by crafted input, network traffic analysis tools could be used to detect suspicious packets targeting the speed_dir parameter. However, no specific detection commands are provided in the available resources. [1]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the router's management interface to trusted users only, applying any available firmware updates from Tenda addressing this issue, and monitoring for unusual device behavior indicating exploitation attempts. If no patch is available, consider disabling remote management or isolating the device from untrusted networks to prevent exploitation via crafted inputs to the speed_dir parameter. [1]

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