CVE-2018-3864 : Exploit Details and Defense Strategies

A critical buffer overflow vulnerability exists in the Samsung SmartThings Hub STH-ETH-250 firmware version 0.20.17, allowing attackers to exploit the Samsung WifiScan handler of the video-core's HTTP server.

Understanding CVE-2018-3864

This CVE involves a buffer overflow in the Samsung SmartThings Hub STH-ETH-250 firmware version 0.20.17, posing a significant security risk.

What is CVE-2018-3864?

The vulnerability is a buffer overflow in the Samsung WifiScan handler of the video-core's HTTP server, triggered when the strcpy function exceeds the 40-byte destination buffer capacity. Attackers can exploit this by sending a lengthy "password" value.

The Impact of CVE-2018-3864

CVSS Base Score: 9.9 (Critical)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Changed
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2018-3864

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability arises from a buffer overflow in the Samsung WifiScan handler of the video-core's HTTP server, allowing attackers to execute malicious activities.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a "password" value of any length, triggering the buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2018-3864 requires immediate action and long-term security measures.

Immediate Steps to Take

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

Long-Term Security Practices

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

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the risk of exploitation.