CVE-2017-16264 in Insteon
Summary
by MITRE • 01/12/2023
Multiple exploitable buffer overflow vulnerabilities exist in the PubNub message handler for the "cc" channel of Insteon Hub running firmware version 1012. Specially crafted commands sent through the PubNub service can cause a stack-based buffer overflow overwriting arbitrary data. An attacker should send an authenticated HTTP request to trigger this vulnerability. In cmd l_b, at 0x9d015cfc, the value for the `grp` key is copied using `strcpy` to the buffer at `$sp+0x1b4`.This buffer is 8 bytes large, sending anything longer will cause a buffer overflow.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 02/05/2023
The vulnerability identified as CVE-2017-16264 represents a critical stack-based buffer overflow flaw within the Insteon Hub's PubNub message handling system. This issue specifically targets the "cc" channel functionality of the device's firmware version 1012, creating a pathway for remote exploitation that could compromise the entire home automation infrastructure. The vulnerability stems from improper input validation and unsafe string handling practices within the device's communication protocols, making it particularly dangerous given the widespread use of smart home devices in residential and commercial environments.
The technical implementation of this vulnerability occurs within the cmd l_b function at memory address 0x9d015cfc where the system processes incoming data from the PubNub service. The flaw manifests when the value associated with the `grp` key is copied using the dangerous strcpy function directly into a buffer located at $sp+0x1b4. This buffer allocation is insufficiently sized at only 8 bytes, creating an immediate overflow condition when user-supplied data exceeds this boundary. The use of strcpy without proper bounds checking represents a classic CWE-121 buffer overflow vulnerability, where the lack of input sanitization allows attackers to overwrite adjacent memory locations including return addresses and control data. The attack vector requires an authenticated HTTP request, indicating that while the vulnerability is remotely exploitable, it necessitates prior access to the device's administrative credentials or network presence.
The operational impact of this vulnerability extends beyond simple code execution, potentially enabling complete system compromise of the Insteon Hub device. Attackers could leverage this buffer overflow to execute arbitrary code, gain persistent access to the home automation network, or even escalate privileges to gain control over connected smart home devices. The nature of the overflow allows for potential memory corruption that could lead to denial of service conditions, data exfiltration, or the installation of persistent backdoors within the home network infrastructure. Given that the Insteon Hub serves as a central communication hub for smart home devices, exploitation of this vulnerability could provide attackers with access to an entire ecosystem of connected devices, creating a significant security risk for users who rely on these systems for home automation and security monitoring.
Mitigation strategies for CVE-2017-16264 should prioritize immediate firmware updates from Insteon to address the underlying buffer overflow condition. Network segmentation and access control measures should be implemented to limit exposure of the Insteon Hub to untrusted networks, while authentication controls must be strengthened to prevent unauthorized access. The vulnerability demonstrates the importance of input validation and secure coding practices, particularly in embedded systems where memory constraints and resource limitations can lead to unsafe programming practices. Organizations and individuals should also implement network monitoring to detect unusual traffic patterns that might indicate exploitation attempts, while considering the deployment of intrusion detection systems specifically designed to identify buffer overflow exploitation patterns. The ATT&CK framework categorizes this vulnerability under privilege escalation and remote code execution techniques, highlighting the need for comprehensive security monitoring and incident response procedures to address potential exploitation attempts.