CVE-2018-3897 : Vulnerability Insights and Analysis

Samsung SmartThings Hub STH-ETH-250 with Firmware version 0.20.17 is vulnerable to a critical buffer overflow in the /cameras/XXXX/clips handler of its video-core HTTP server.

Understanding CVE-2018-3897

This CVE involves a security flaw in the Samsung SmartThings Hub that allows for a buffer overflow vulnerability.

What is CVE-2018-3897?

The vulnerability exists in the /cameras/XXXX/clips handler of the video-core's HTTP server.
It stems from the incorrect extraction of fields from a user-controlled JSON payload, leading to a stack-based buffer overflow.
Attackers can exploit this by sending a lengthy "callbackUrl" value.

The Impact of CVE-2018-3897

CVSS Score: 9.9 (Critical)
Severity: High impact on confidentiality, integrity, and availability
Attack Vector: Network
Privileges Required: Low
Scope: Changed
User Interaction: None

Technical Details of CVE-2018-3897

The technical aspects of the vulnerability.

Vulnerability Description

The flaw allows for a buffer overflow on the stack due to the strncpy call exceeding the destination buffer's size limit.

Affected Systems and Versions

Affected Product: SmartThings Hub STH-ETH-250
Vendor: Samsung
Affected Version: Firmware version 0.20.17

Exploitation Mechanism

Attackers exploit the vulnerability by sending a "callbackUrl" value with arbitrary length.

Mitigation and Prevention

Ways to address and prevent the CVE.

Immediate Steps to Take

Update the firmware to a patched version.
Implement network segmentation to limit exposure.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update all software and firmware.
Conduct security assessments and penetration testing.
Educate users on safe practices and awareness.

Patching and Updates

Samsung may release patches to address the buffer overflow vulnerability.