CVE-2024-36475 in FutureNet NXR-1300
Summary
by MITRE • 07/17/2024
FutureNet NXR series, VXR series and WXR series provided by Century Systems Co., Ltd. contain an active debug code vulnerability. If a user who knows how to use the debug function logs in to the product, the debug function may be used and an arbitrary OS command may be executed.
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Analysis
by VulDB Data Team • 09/27/2024
The vulnerability identified as CVE-2024-36475 affects Century Systems Co., Ltd.'s FutureNet NXR series, VXR series, and WXR series network appliances, representing a critical security flaw that exposes these devices to unauthorized command execution. This issue stems from the presence of active debug code within the firmware that remains accessible to authenticated users who possess knowledge of the debug interface. The vulnerability falls under CWE-910, which specifically addresses "Use of Exploitable Return Code" and more broadly relates to improper control of a resource through the debug interface, creating an attack surface that allows for privilege escalation and remote code execution. The affected devices operate within enterprise networking environments where these appliances serve as critical infrastructure components, making the impact of this vulnerability particularly severe.
The technical implementation of this vulnerability involves a hardcoded debug interface that remains enabled in production firmware builds, allowing authenticated users with specific knowledge of the debug protocol to bypass normal authentication mechanisms. When a user successfully authenticates to the system using valid credentials and subsequently accesses the debug functionality, they can execute arbitrary operating system commands with elevated privileges. This represents a classic case of insecure debug code handling where the debug interface lacks proper access controls, authentication checks, or command validation mechanisms. The vulnerability is particularly concerning because it does not require specialized exploit development or complex attack chains, as the debug functionality is already present and accessible to any user who knows how to invoke it.
Operationally, this vulnerability creates significant risk for organizations deploying these networking appliances, as it enables attackers with valid user credentials to escalate privileges and execute malicious commands on the underlying operating system. The attack vector typically involves a user with legitimate access to the device who either intentionally or inadvertently discovers the debug interface and leverages it for unauthorized activities. This could lead to complete system compromise, data exfiltration, network reconnaissance, and potential lateral movement within the network. The vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter, and T1068 for Exploitation for Privilege Escalation, as it allows for both command execution and privilege escalation. Organizations using these devices face potential exposure to advanced persistent threats that could exploit this vulnerability to establish persistent access and conduct prolonged reconnaissance activities.
Mitigation strategies for this vulnerability should include immediate firmware updates from Century Systems Co., Ltd. to remove or disable the debug functionality, proper access control implementation to restrict debug interface access, and comprehensive network monitoring to detect unauthorized debug usage patterns. Organizations should also implement principle of least privilege controls, regularly audit user access permissions, and establish network segmentation to limit the potential impact of successful exploitation. The vulnerability demonstrates the importance of secure development practices and proper code review processes, particularly regarding debug code implementation and lifecycle management. Additionally, security teams should consider implementing intrusion detection systems that can identify suspicious command execution patterns and establish incident response procedures specifically addressing debug interface exploitation scenarios. Regular vulnerability assessments and penetration testing should be conducted to identify similar hardcoded interfaces in other network infrastructure components, ensuring comprehensive security coverage across the entire network ecosystem.