CVE-2025-36755 in BlueOne
Summary
by MITRE • 12/12/2025
The CleverDisplay BlueOne hardware player is designed with its USB interfaces physically enclosed and inaccessible under normal operating conditions. Researchers demonstrated that, after cicumventing the device’s protective enclosure, it was possible to connect a USB keyboard and press ESC during boot to access the BIOS setup interface. BIOS settings could be viewed but not modified. This behavior slightly increases the attack surface by exposing internal system information (CWE-1244) once the enclosure is removed, but does not allow integrity or availability compromise under standard or tested configurations.
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Analysis
by VulDB Data Team • 12/14/2025
The CleverDisplay BlueOne hardware player represents a specialized digital signage solution that incorporates physical security measures to protect its internal USB interfaces. The device is engineered with a protective enclosure that normally prevents access to these critical connection points during standard operation. However, security researchers identified a significant vulnerability in the device's physical security implementation that undermines its intended protection mechanisms. The flaw manifests during the device's boot process when an attacker with physical access can bypass the protective enclosure and connect a USB keyboard to access the BIOS setup interface. This vulnerability demonstrates a critical weakness in the device's security architecture where the physical access control measures prove insufficient against determined attackers who can overcome the mechanical barriers through direct intervention.
The technical exploitation of this vulnerability involves a specific sequence of physical actions that exploit the device's boot process timing and access controls. When an attacker removes the protective enclosure, they can connect a USB keyboard and press the ESC key during the boot sequence to gain access to the BIOS setup interface. While this access provides visibility into system configuration parameters and internal device information, it does not permit modification of BIOS settings or direct system manipulation. The vulnerability specifically relates to CWE-1244 which addresses information exposure through physical access, where the device's design inadvertently reveals internal system information when physical security measures are circumvented. This particular implementation fails to maintain proper information flow control even when physical access is gained, creating an information disclosure risk that could aid attackers in understanding the device's internal configuration and security posture.
The operational impact of this vulnerability extends beyond simple information disclosure to create potential risks for the overall security posture of the device and its deployed environment. Although the vulnerability does not permit modification of system parameters or compromise system integrity, the exposure of BIOS configuration details and internal system information can significantly aid attackers in planning more sophisticated attacks against the device. The ability to observe system information without modification creates a reconnaissance opportunity that could be combined with other vulnerabilities or attack vectors to compromise the device's security. This exposure particularly affects the device's operational security in environments where physical access control is assumed to provide comprehensive protection. The vulnerability essentially creates a window of opportunity during boot processes where an attacker can gain visibility into the system's internal configuration, potentially revealing firmware versions, hardware specifications, and system parameters that could be used to craft targeted attacks against the device.
The security implications of this vulnerability highlight the critical importance of comprehensive physical security design in embedded systems and hardware devices. Organizations deploying CleverDisplay BlueOne players must consider the potential risks associated with physical access to devices that contain sensitive operational information. The vulnerability demonstrates that even devices with protective enclosures can be compromised when attackers have the opportunity to bypass physical barriers during specific operational phases. This finding reinforces the need for robust physical security measures that prevent unauthorized access throughout the entire operational lifecycle of the device rather than just during specific access points. The vulnerability also underscores the importance of implementing proper access controls at all system levels, including the boot process, to prevent unauthorized visibility into system configuration and internal device information. Organizations should implement additional physical security measures and monitor for unauthorized physical access to prevent exploitation of this vulnerability.
Mitigation strategies for this vulnerability should focus on enhancing physical security measures and implementing additional access controls to prevent unauthorized physical access during critical operational phases. Organizations should consider implementing tamper-evident seals, improved enclosure designs, and access control mechanisms that prevent unauthorized physical access to the device during boot processes. The device manufacturer should consider implementing enhanced boot security measures that prevent access to the BIOS setup interface even when physical access is gained through the removal of protective enclosures. Additionally, implementing logging mechanisms to detect unauthorized physical access attempts and establishing proper security procedures for device maintenance and access can help prevent exploitation of this vulnerability. The implementation of these measures aligns with best practices for physical security in embedded systems and addresses the specific weaknesses identified in the device's current security architecture. Organizations should also consider conducting regular physical security assessments to identify potential vulnerabilities in their deployed devices and implement appropriate controls to prevent unauthorized access and information disclosure.