CVE-2018-3903 : Security Advisory and Response

Samsung SmartThings Hub STH-ETH-250 devices with firmware version 0.20.17 are vulnerable to a stack buffer overflow due to a flaw in the video-core process.

Understanding CVE-2018-3903

This CVE involves a critical vulnerability in Samsung SmartThings Hub STH-ETH-250 devices that can be exploited by an attacker through an HTTP request.

What is CVE-2018-3903?

The flaw in the firmware version 0.20.17 of Samsung SmartThings Hub STH-ETH-250 devices allows attackers to trigger a stack buffer overflow by manipulating a user-controlled JSON payload.

The Impact of CVE-2018-3903

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

Technical Details of CVE-2018-3903

The technical details of the vulnerability provide insights into its description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The flaw arises from the memcpy function exceeding the destination buffer's size limit of 512 bytes, allowing an attacker to overwrite the saved-PC with a specific hexadecimal value.

Affected Systems and Versions

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

Exploitation Mechanism

By sending an HTTP request with a manipulated "url" value, an attacker can exploit the vulnerability to trigger a stack buffer overflow.

Mitigation and Prevention

To address CVE-2018-3903, immediate steps and long-term security practices are crucial.

Immediate Steps to Take

Update the firmware to a patched version.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch all devices and systems.
Conduct security assessments and penetration testing to identify vulnerabilities.

Patching and Updates

Apply security patches provided by the vendor promptly to mitigate the vulnerability and enhance system security.