CVE-2018-3926 Explained : Impact and Mitigation

The Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17 has a vulnerability in its ZigBee firmware update routine that can be exploited through an integer underflow, potentially leading to a crash.

Understanding CVE-2018-3926

This CVE entry describes a specific vulnerability affecting the Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17.

What is CVE-2018-3926?

An integer underflow vulnerability exists in the ZigBee firmware update routine of the Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17. This vulnerability can be triggered by sending an HTTP request, causing the hubCore process to crash.

The Impact of CVE-2018-3926

The vulnerability has a CVSS base score of 5.3, indicating a medium severity issue. The mishandling of malformed files in the hubCore binary's data directory can lead to an infinite loop, resulting in a crash. The attack complexity is high, and the availability impact is also high.

Technical Details of CVE-2018-3926

This section provides more technical insights into the CVE-2018-3926 vulnerability.

Vulnerability Description

The hubCore process of the Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17 incorrectly handles malformed files in its data directory, leading to an exploitable integer underflow vulnerability.

Affected Systems and Versions

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

Exploitation Mechanism

Attack Vector: Local
Privileges Required: High
Scope: Changed
User Interaction: None
Attack Complexity: High
Confidentiality Impact: None
Integrity Impact: None
Availability Impact: High

Mitigation and Prevention

Protecting systems from CVE-2018-3926 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Monitor network traffic for any suspicious HTTP requests.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly update firmware and software to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.
Educate users and administrators about safe practices to prevent exploitation.

Patching and Updates

Ensure that the Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17 is updated with the latest firmware patches to mitigate the CVE-2018-3926 vulnerability.