CVE-2018-3908 : Security Advisory and Response

The Samsung SmartThings Hub STH-ETH-250-Firmware version 0.20.17 has a critical vulnerability in its REST parser for the video-core's HTTP server, allowing consecutive HTTP requests to overwrite previously parsed data.

Understanding CVE-2018-3908

This CVE involves a vulnerability in the Samsung SmartThings Hub STH-ETH-250-Firmware version 0.20.17, impacting its REST parser for the video-core's HTTP server.

What is CVE-2018-3908?

The vulnerability arises from incorrect handling of pipelined HTTP requests by the video-core process, enabling attackers to overwrite previously parsed HTTP method, URL, and body data.

The Impact of CVE-2018-3908

CVSS Base Score: 9.1 (Critical)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality Impact: None
Integrity Impact: High
Availability Impact: High
This vulnerability can be exploited by sending HTTP requests while using the on_body callback.

Technical Details of CVE-2018-3908

The technical aspects of the CVE provide insight into the vulnerability's description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability in the REST parser of the video-core's HTTP server allows attackers to manipulate consecutive HTTP requests, leading to data overwriting.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can trigger the vulnerability by sending HTTP requests utilizing the on_body callback, defined by sub_41734.

Mitigation and Prevention

To address CVE-2018-3908, immediate steps and long-term security practices are essential.

Immediate Steps to Take

Update the firmware to the latest version provided by Samsung.
Monitor network traffic for any suspicious activity.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly update and patch all devices and systems in the network.
Conduct security training for users to recognize and report suspicious activities.

Patching and Updates

Stay informed about security updates and patches released by Samsung for the SmartThings Hub.