Executive Summary

Yarbo firmware version 2.3.9 contains hardcoded administrative credentials embedded directly in the firmware image.

These credentials are the same across all devices running this firmware and cannot be changed or removed by end users.

As a result, anyone who knows these credentials can easily gain unauthorized access to the device management interfaces.

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Impact Analysis

This vulnerability allows trivial unauthorized access to device management interfaces without any user interaction or privileges.

An attacker who knows the hardcoded credentials can fully control the affected devices remotely.

The CVSS base score of 9.8 indicates a critical impact, including high confidentiality, integrity, and availability risks.

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Mitigation Strategies

Yarbo firmware v2.3.9 contains hardcoded administrative credentials that cannot be changed or removed by end users, enabling trivial unauthorized access.

Because the credentials are embedded and identical across all devices, immediate mitigation steps are limited.

Users should consider isolating affected devices from untrusted networks to reduce exposure.

Monitoring device management interfaces for unauthorized access attempts is recommended.

Contacting the vendor for firmware updates or patches that address this issue is advised.

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Compliance Impact

The vulnerability involves hardcoded administrative credentials that are identical across all devices and cannot be changed or removed by end users. This enables trivial unauthorized access to device management interfaces by anyone who knows these credentials.

Such unauthorized access risks compromising the confidentiality, integrity, and availability of the device and any data it handles. This can lead to violations of common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access.

Specifically, the inability to change or remove default credentials undermines security controls mandated by these regulations, potentially resulting in non-compliance due to insufficient access controls and increased risk of data breaches.

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Detection Guidance

The vulnerability involves hardcoded administrative credentials embedded in the Yarbo firmware v2.3.9, which are identical across all devices and cannot be changed or removed. Detection would focus on identifying devices running this specific firmware version and attempting to verify if these default credentials grant access.

Since the credentials are embedded in the firmware image and provide access to device management interfaces, one approach is to scan your network for devices running Yarbo firmware v2.3.9 and then attempt to log in using the known hardcoded credentials.

Specific commands are not provided in the available resources, but general detection steps could include:

• Use network scanning tools like nmap to identify devices with open management ports (e.g., HTTP, HTTPS, Telnet, SSH) that might be running Yarbo firmware.
• Attempt to access the device management interface using the known hardcoded credentials.
• Check firmware version information via device banners or management interfaces to confirm if the device runs Yarbo firmware v2.3.9.

Without explicit commands or scripts provided in the resources, these general steps are recommended for detection.

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