CVE-2018-3919 : Exploit Details and Defense Strategies

A vulnerability in the video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250 devices with firmware version 0.20.17 allows for a stack-based buffer overflow, potentially leading to unauthorized access to database fields.

Understanding CVE-2018-3919

This CVE involves a critical vulnerability in Samsung SmartThings Hub STH-ETH-250 devices that could be exploited through the device's HTTP server.

What is CVE-2018-3919?

The vulnerability in the video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250 devices with firmware version 0.20.17 allows the retrieval of database fields in an exploitable stack-based buffer overflow manner.

The Impact of CVE-2018-3919

CVSS Base Score: 7.5 (High)
Attack Vector: Local
Attack Complexity: High
Privileges Required: High
Confidentiality, Integrity, and Availability Impact: High
Scope: Changed
Exploiting this vulnerability could lead to unauthorized access to sensitive data and potential system compromise.

Technical Details of CVE-2018-3919

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

The vulnerability arises from the insecure processing of the "clips" table in the device's SQLite database by the video-core process, resulting in a stack buffer overflow.

Affected Systems and Versions

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

Exploitation Mechanism

Exploiting this vulnerability is possible by sending a sequence of HTTP requests to the device's video-core's HTTP server.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2018-3919.

Immediate Steps to Take

Update the firmware of the SmartThings Hub STH-ETH-250 device to a secure version.
Monitor network traffic for any suspicious activity.
Restrict access to the device from untrusted sources.

Long-Term Security Practices

Regularly update all devices and software to the latest secure versions.
Implement network segmentation to isolate critical devices.
Conduct regular security assessments and penetration testing.

Patching and Updates

Samsung may release patches or updates to address this vulnerability. Stay informed about security advisories from the vendor.