CVE-2017-14447 in Insteon
Summary
by MITRE
An exploitable buffer overflow vulnerability exists in the PubNub message handler for the 'ad' 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.
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Analysis
by VulDB Data Team • 05/01/2023
The vulnerability described in CVE-2017-14447 represents a critical stack-based buffer overflow within the PubNub message handler component of Insteon Hub firmware version 1012. This flaw specifically targets the 'ad' channel functionality, which serves as a communication interface between the smart home hub and external PubNub messaging services. The vulnerability stems from inadequate input validation and memory management within the message processing pipeline, creating a scenario where maliciously crafted data can exceed the allocated buffer space and overwrite adjacent memory locations. The attack vector requires an authenticated HTTP request to be sent to the device, indicating that the vulnerability operates at the application layer and leverages existing authentication mechanisms within the system.
The technical implementation of this buffer overflow occurs when the PubNub message handler processes incoming data through the 'ad' channel without proper bounds checking or sanitization. This allows an attacker to craft specially formatted commands that, when processed by the vulnerable firmware, cause the stack memory to be overwritten with malicious data. The overflow can potentially overwrite return addresses, function pointers, or other critical control data within the stack frame, leading to arbitrary code execution or system instability. According to CWE standards, this vulnerability maps directly to CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions. The attack follows the typical exploitation pattern where an attacker must first establish authentication credentials to access the vulnerable endpoint, then send malicious payloads that trigger the memory corruption.
The operational impact of this vulnerability extends beyond simple system crashes or instability, as it provides a potential pathway for remote code execution on the Insteon Hub device. Since the vulnerability requires only authenticated HTTP access, an attacker who has gained credentials to the device could potentially escalate privileges or gain complete control over the smart home hub. This compromises the entire security ecosystem of the connected home automation system, as the Insteon Hub serves as a central coordinator for multiple smart devices. The vulnerability affects the device's ability to maintain secure communication channels and could enable attackers to manipulate or disable security features. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation, as it enables attackers to execute arbitrary code and potentially escalate their access level within the network.
Mitigation strategies for this vulnerability must address both the immediate security risk and the broader architectural concerns of the device's communication protocols. Organizations should implement immediate firmware updates from Insteon to patch the buffer overflow vulnerability, while also strengthening authentication mechanisms and access controls around the PubNub message handler interface. Network segmentation and monitoring should be enhanced to detect anomalous traffic patterns that might indicate exploitation attempts. The vulnerability highlights the importance of input validation and secure coding practices in IoT devices, particularly those handling external messaging services. Security teams should also consider implementing intrusion detection systems that can monitor for the specific patterns associated with buffer overflow exploitation attempts. Additionally, regular security assessments of IoT device firmware and communication protocols should be conducted to identify similar vulnerabilities before they can be exploited by adversaries.