Buffer Overflow in Tenda A18 Router Firmware

Executive Summary

This is a Buffer Overflow vulnerability in the Tenda A18 router firmware version 15.13.07.09. It allows a remote attacker to execute arbitrary code by exploiting the fromSetCmdlineRun function.

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Detection Guidance

To detect this vulnerability, inspect network traffic for POST requests targeting the Tenda A18 router's web interface. Look for the wpapsk_crypto5g parameter in requests where configured2_4g is not 'true' and configured5g is 'true'. Check if the input length exceeds 16 bytes for the wpapsk_cryptovalue array.

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Impact Analysis

A remote attacker could exploit this to run malicious code on your device, potentially gaining control over the router, intercepting network traffic, or launching further attacks.

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Compliance Impact

The vulnerability allows arbitrary code execution or denial of service via a buffer overflow in the Tenda A18 router. This could lead to unauthorized access to sensitive data, potentially violating GDPR's data protection requirements and HIPAA's security rules for protected health information.

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Mitigation Strategies

Immediately update the Tenda A18 firmware to the latest version if a patch is available. If no patch exists, consider isolating the device from the network or disabling remote access to prevent exploitation.

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