CVE-2017-16314 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 s_sonos, at 0x9d01c1cc, the value for the `s_speaker` key is copied using `strcpy` to the buffer at `$sp+0x2b0`.This buffer is 32 bytes large, sending anything longer will cause a buffer overflow.
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Analysis
by VulDB Data Team • 02/04/2023
The vulnerability described in CVE-2017-16314 represents a critical stack-based buffer overflow within the Insteon Hub's PubNub message handler implementation. This flaw exists specifically within the "cc" channel processing functionality of the device's firmware version 1012, creating a significant security risk for users of this smart home automation system. The vulnerability manifests when the device processes specially crafted commands transmitted through the PubNub messaging service, which serves as a communication backbone for many IoT devices. The attack vector requires an authenticated HTTP request to be executed successfully, indicating that while the vulnerability is exploitable, it does require some level of prior access or authentication to the system. This characteristic places the vulnerability in the context of privilege escalation or lateral movement scenarios within an already compromised network environment.
The technical implementation of this buffer overflow occurs at the memory address 0x9d01c1cc within the cmd s_sonos function, where the system performs an unsafe string copy operation using the strcpy function. The vulnerable code attempts to copy data from the `s_speaker` key value into a buffer located at stack pointer plus 0x2b0 offset, which is only 32 bytes in size. This fundamental design flaw directly violates secure coding practices and creates a predictable exploitation scenario where an attacker can precisely control the overflow behavior. The buffer overflow occurs because the system fails to perform proper bounds checking before copying the input data, allowing an attacker to overwrite adjacent memory locations including potentially critical program state information, return addresses, or other control data. This specific implementation pattern aligns with CWE-121, which describes stack-based buffer overflow conditions, and demonstrates the classic unsafe string handling vulnerability that has been a persistent threat in embedded systems development.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as stack-based buffer overflows can potentially enable arbitrary code execution when properly exploited. An attacker who successfully triggers this vulnerability could gain unauthorized control over the Insteon Hub device, potentially accessing the entire home automation network managed by the device. The consequences include unauthorized access to smart home controls, potential data exfiltration from the network, and the ability to manipulate connected devices such as lighting systems, security cameras, and other IoT appliances. The vulnerability's presence in a device that serves as a central hub for home automation makes it particularly dangerous, as it could provide attackers with persistent access to a user's smart home environment. This threat scenario aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1071, which addresses application layer protocols, as the attack leverages legitimate communication protocols to achieve malicious objectives. The vulnerability also represents a significant concern for IoT security, where devices often lack proper input validation and memory protection mechanisms.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from the vendor, as the most effective solution requires addressing the root cause through proper bounds checking and secure string handling practices. System administrators should implement network segmentation to limit access to the Insteon Hub device and reduce the potential attack surface, while also monitoring for unusual PubNub traffic patterns that might indicate exploitation attempts. The vulnerability highlights the importance of secure coding practices in embedded systems development, particularly around memory management and input validation. Organizations should consider implementing network-based intrusion detection systems to monitor for suspicious HTTP requests that target known vulnerable functions, and establish robust patch management procedures to ensure timely deployment of security updates. Additionally, the vulnerability demonstrates the critical need for input sanitization and bounds checking in all network-facing applications, as the use of dangerous functions like strcpy without proper validation creates predictable attack vectors that can be exploited by determined adversaries.