CVE-2016-6567 in Resident Download Manager
Summary
by MITRE
SHDesigns' Resident Download Manager provides firmware update capabilities for Rabbit 2000/3000 CPU boards, which according to the reporter may be used in some industrial control and embedded applications. The Resident Download Manager does not verify that the firmware is authentic before executing code and deploying the firmware to devices. A remote attacker with the ability to send UDP traffic to the device may be able to execute arbitrary code on the device. According to SHDesigns' website, the Resident Download Manager and other Rabbit Tools have been discontinued since June 2011.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 12/27/2024
The vulnerability identified as CVE-2016-6567 affects SHDesigns' Resident Download Manager, a firmware update utility designed for Rabbit 2000/3000 CPU boards that are reportedly utilized in industrial control and embedded systems. This software represents a critical security gap in the update infrastructure of embedded devices, where the absence of authentication mechanisms creates a significant attack surface for malicious actors. The vulnerability stems from the lack of firmware authenticity verification during the update process, which fundamentally undermines the security model of the device's firmware deployment mechanism. The Resident Download Manager's design flaw allows for arbitrary code execution without proper validation of the firmware source, creating a pathway for attackers to compromise the targeted systems.
The technical implementation of this vulnerability resides in the protocol handling within the Resident Download Manager software, specifically its UDP-based communication interface. When a device receives firmware update packets through UDP traffic, the system fails to perform cryptographic verification or digital signature validation before executing and installing the firmware code. This absence of integrity checks represents a classic security weakness that aligns with CWE-327, which addresses the use of weak cryptographic algorithms or the absence of cryptographic verification mechanisms. The vulnerability's remote exploitability means that an attacker can send malicious UDP packets to the device without requiring physical access or network proximity, making it particularly dangerous in industrial environments where such devices may be exposed to untrusted network segments.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise within industrial control environments. When an attacker successfully exploits this vulnerability, they gain the ability to install malicious firmware that can persist across device reboots and potentially establish backdoors for future access. This represents a severe threat to operational technology infrastructure, where the integrity of embedded systems is paramount for maintaining safety and operational continuity. The vulnerability affects devices that may be part of critical manufacturing processes, monitoring systems, or control networks where unauthorized code execution could lead to production disruptions, safety hazards, or data compromise. The fact that this software has been discontinued since 2011 means that affected devices lack official security updates or patches, leaving them permanently vulnerable to exploitation.
The remediation of this vulnerability requires immediate action from affected organizations, including network segmentation to isolate vulnerable devices from untrusted networks and implementing network monitoring to detect suspicious UDP traffic patterns. Organizations should conduct comprehensive inventory assessments to identify all devices running the discontinued Resident Download Manager software and develop migration plans to replace these systems with modern, secure alternatives. The vulnerability also highlights the importance of maintaining up-to-date security practices in industrial environments, where legacy systems often present persistent security challenges. According to ATT&CK framework considerations, this vulnerability maps to techniques involving privilege escalation and persistence through firmware manipulation, making it particularly concerning for industrial control systems that require long-term operational reliability. Given the discontinued nature of the software, the most effective mitigation strategy involves complete system replacement or hardware upgrades that support secure firmware update mechanisms with proper authentication and integrity verification capabilities.