Weak Password Requirements in Tenda AC15 Samba Configuration

Executive Summary

This vulnerability exists in the Tenda AC15 router firmware version 15.03.05.19, specifically related to an unknown function within the Samba component's /etc_ro/smb.conf file.

The issue allows an attacker within the local network to manipulate the system in a way that results in weak password requirements.

Exploitation of this vulnerability is considered difficult due to the high complexity level, and it requires local network access.

The exploit code has been made publicly available, which could facilitate attacks.

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Impact Analysis

If exploited, this vulnerability can lead to weak password enforcement on the affected device.

Weak passwords increase the risk of unauthorized access to the device or network resources managed by the Samba service.

Since the attack requires local network access and is difficult to execute, the immediate risk is somewhat limited but still significant in environments where local network access is possible.

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Detection Guidance

This vulnerability involves a weakness in the Samba component of Tenda AC15 15.03.05.19, specifically related to the file /etc_ro/smb.conf that leads to weak password requirements. Detection would require inspecting the Samba configuration on the affected device within the local network.

Since the attack is only possible within the local network and involves Samba configuration, you can check the smb.conf file for weak password policies or unusual settings.

• Use a command like `cat /etc_ro/smb.conf` on the device to review the Samba configuration file.
• Scan your local network for devices running Samba services using `nmap -p 139,445 --open <local_network_range>`.
• Check Samba version and configuration for weak password policies or unusual settings that could indicate vulnerability.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the Samba service to trusted local network users only, as the attack requires local network access.

Review and strengthen password policies in the Samba configuration file (/etc_ro/smb.conf) to enforce strong password requirements.

If possible, update the Tenda AC15 firmware to a version that addresses this vulnerability or apply any available patches.

Monitor network traffic for suspicious activity related to Samba services and limit exposure by disabling unnecessary Samba features.

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Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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