CVE-2019-15786 in Dynamixel SDK
Summary
by MITRE
ROBOTIS Dynamixel SDK through 3.7.11 has a buffer overflow via a large rxpacket.
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Analysis
by VulDB Data Team • 12/07/2023
The vulnerability identified as CVE-2019-15786 affects the ROBOTIS Dynamixel SDK version 3.7.11 and earlier, representing a critical buffer overflow flaw that can be exploited through the processing of large rxpacket data structures. This issue resides within the software development kit designed for controlling Dynamixel servo motors, which are widely used in robotics applications across industrial, educational, and hobbyist environments. The buffer overflow vulnerability manifests when the SDK receives oversized packet data during communication with Dynamixel devices, creating a potential attack surface that could compromise system integrity and operational safety.
The technical flaw stems from inadequate input validation within the SDK's packet reception handling mechanism. When a maliciously crafted rxpacket exceeds the allocated buffer size, the software fails to properly bounds-check the incoming data before copying it into memory structures. This classic buffer overflow condition allows an attacker to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system crashes. The vulnerability is particularly concerning because it operates at the communication layer where the SDK processes data from Dynamixel motors, making it accessible through normal communication protocols. The flaw aligns with CWE-121, which categorizes buffer overflow conditions as critical memory safety issues, and demonstrates how improper memory management can create persistent security weaknesses in embedded systems software.
The operational impact of this vulnerability extends beyond simple system instability to potentially compromising robotic systems in production environments. In industrial settings where Dynamixel servos control critical machinery or robotic arms, an attacker could exploit this vulnerability to cause unpredictable behavior, system failures, or even physical damage to equipment. The vulnerability affects not only standalone applications using the SDK but also complex robotic systems that rely on multiple Dynamixel devices for coordinated motion control. The potential for remote exploitation increases the risk significantly, as attackers could potentially compromise systems through network-based communication channels without physical access to the hardware. This threat model aligns with ATT&CK technique T1203, which covers exploitation of remote services and network-based attacks against embedded systems.
Mitigation strategies for CVE-2019-15786 require immediate attention from system administrators and developers working with Dynamixel-based robotic platforms. The primary solution involves upgrading to ROBOTIS Dynamixel SDK version 3.7.12 or later, which includes proper bounds checking and memory validation mechanisms. Organizations should conduct thorough vulnerability assessments of their robotic infrastructure to identify systems running affected SDK versions and implement patch management procedures. Additional defensive measures include network segmentation to limit access to Dynamixel communication ports, implementing intrusion detection systems to monitor for unusual packet patterns, and conducting regular security audits of robotic control software. The vulnerability also highlights the importance of secure coding practices in embedded systems development, emphasizing the need for comprehensive input validation and memory safety measures in all communication protocols. System architects should consider implementing redundant safety mechanisms and fail-safe protocols to minimize the operational impact should exploitation occur despite preventive measures.