CVE-2025-8640 in DMX958XR
Summary
by MITRE • 08/06/2025
Kenwood DMX958XR Firmware Update Command Injection Vulnerability. This vulnerability allows physically present attackers to execute arbitrary code on affected installations of Kenwood DMX958XR devices. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the firmware update process. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-26263.
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Analysis
by VulDB Data Team • 08/06/2025
The CVE-2025-8640 vulnerability represents a critical command injection flaw in the Kenwood DMX958XR device firmware update mechanism, classified under CWE-77 as improper neutralization of special elements used in a command. This vulnerability fundamentally compromises the device's security posture by allowing execution of arbitrary commands without authentication requirements, making it particularly dangerous for physically present attackers who can exploit the flaw directly on the device. The vulnerability resides in the firmware update process where user-supplied input is not properly validated before being utilized in system calls, creating a direct path for privilege escalation to root level execution. The attack vector requires only physical access to the device, eliminating the need for network connectivity or authentication credentials, which significantly broadens the potential threat surface and makes this vulnerability particularly concerning for environments where physical security controls may be insufficient.
The technical exploitation of this vulnerability occurs during the firmware update procedure when the system fails to sanitize user input before incorporating it into system commands. This lack of input validation creates a command injection attack surface where malicious input can be interpreted and executed as shell commands with the highest privileges available on the system. The vulnerability's impact extends beyond simple code execution to full system compromise, as the attacker can leverage root privileges to modify system files, install backdoors, or manipulate device behavior in ways that could compromise security monitoring and operational integrity. The absence of authentication requirements for exploitation means that any individual with physical access to the device can potentially exploit this vulnerability, making it a significant concern for devices deployed in environments where unauthorized physical access cannot be completely prevented. This weakness aligns with ATT&CK technique T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation, demonstrating how this vulnerability can be leveraged to achieve complete system compromise.
The operational impact of CVE-2025-8640 extends far beyond the immediate compromise of individual devices, potentially affecting entire networks or security infrastructures that rely on these devices for communication or monitoring functions. Organizations deploying Kenwood DMX958XR devices may face severe consequences including unauthorized access to sensitive communications, data exfiltration, or disruption of critical communication services. The vulnerability's requirement for physical presence does not eliminate the risk to organizations that may have insufficient physical security controls, particularly in environments where devices are accessible to unauthorized personnel or where device locations cannot be adequately secured. This makes the vulnerability particularly dangerous in enterprise environments where communication devices may be located in areas with limited physical security measures, such as conference rooms, common areas, or facilities with visitor access policies that do not adequately restrict physical access to network equipment. The root-level execution capability means that attackers can potentially modify device firmware, disable security features, or establish persistent access that could remain undetected for extended periods.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from the vendor, as recommended in the ZDI-CAN-26263 advisory, combined with enhanced physical security measures to prevent unauthorized access to affected devices. Network segmentation and monitoring should be implemented to detect unusual communication patterns that might indicate exploitation attempts, while regular security assessments should verify that physical access controls are adequate for the environment. Organizations should also consider implementing device integrity monitoring solutions that can detect unauthorized firmware modifications or command execution attempts. The vulnerability highlights the critical importance of input validation in embedded systems and firmware components, as demonstrated by the CWE-77 classification, which emphasizes the need for proper sanitization of all user-supplied input before system command execution. Additionally, organizations should review their physical security policies and procedures to ensure that communication devices are adequately protected from unauthorized physical access, particularly in high-risk environments where the potential for exploitation is greatest. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other networked devices and systems that may be vulnerable to similar command injection attacks.