CVE-2025-8639 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 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-26262.
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Analysis
by VulDB Data Team • 08/06/2025
The CVE-2025-8639 vulnerability represents a critical command injection flaw in the Kenwood DMX958XR device firmware update mechanism, demonstrating a fundamental failure in input validation controls. This vulnerability resides within the firmware update process where user-supplied strings are directly incorporated into system calls without adequate sanitization or validation. The flaw enables attackers with physical access to the device to execute arbitrary code with root privileges, effectively compromising the entire system. The vulnerability is particularly concerning because it does not require authentication for exploitation, making it accessible to anyone who can physically interact with the device. This characteristic aligns with common attack patterns identified in the MITRE ATT&CK framework under the T1059.001 technique for command and scripting interpreter, specifically focusing on the execution of system commands through unvalidated input.
The technical implementation of this vulnerability stems from improper input validation within the firmware update functionality, creating a classic command injection scenario where attacker-controlled data flows directly into system command execution contexts. The lack of proper sanitization allows malicious input to be interpreted as shell commands rather than data, enabling full system compromise. This flaw represents a CWE-77 command injection vulnerability, where user-supplied input is improperly handled and executed within a shell context. The vulnerability's exploitation requires only physical presence, making it particularly dangerous in environments where devices might be accessible to unauthorized individuals. The root privilege execution context indicates that the firmware update process operates with elevated permissions, allowing successful exploitation to gain complete administrative control over the device. This scenario exemplifies how insufficient input validation in system-level processes can lead to privilege escalation vulnerabilities.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the device's functionality and potentially exposes network infrastructure to further attacks. An attacker with physical access could use this vulnerability to install backdoors, modify device configurations, or exfiltrate sensitive information from the device. The implications are particularly severe for security appliances like the DMX958XR, which typically serve as critical components in communication and security infrastructure. The vulnerability's presence in a device used for radio communications and security systems could enable attackers to disrupt communications, monitor transmissions, or gain access to sensitive data. This type of vulnerability also creates potential for lateral movement within networks if the device is connected to larger infrastructure, as the compromised device could serve as a pivot point for further attacks. The physical access requirement does not eliminate the threat, as many security environments may have unsecured device access points or may be located in areas where unauthorized physical access is possible.
Mitigation strategies for CVE-2025-8639 should focus on both immediate remediation and long-term security improvements. Organizations should prioritize applying firmware updates from Kenwood as soon as they become available, though the vulnerability's nature suggests that physical security measures are equally critical. The device should be placed in secure locations where physical access is restricted and monitored, implementing proper access controls and surveillance. Network segmentation should be employed to limit the potential impact of a compromised device, and additional monitoring should be implemented to detect unusual behavior patterns. Security professionals should also consider implementing device integrity checking mechanisms and regular security audits to identify similar vulnerabilities in other networked devices. The vulnerability highlights the importance of secure coding practices, particularly in firmware development, where input validation should be implemented at multiple levels to prevent command injection attacks. Organizations should also review their physical security policies and procedures to ensure that devices with such critical vulnerabilities are properly protected from unauthorized physical access. The remediation process should include comprehensive testing of firmware updates to ensure they properly address the vulnerability without introducing new issues, and security teams should maintain awareness of similar vulnerabilities in related devices from the same manufacturer.