CVE-2018-3920 : What You Need to Know

A vulnerability in the firmware update feature of Yi Home Camera 27US 1.8.7.0D allows for code execution through a specially crafted 7-Zip file, potentially leading to unauthorized code execution post-update.

Understanding CVE-2018-3920

This CVE involves a security flaw in the firmware update process of the Yi Home Camera 27US 1.8.7.0D, enabling attackers to execute malicious code.

What is CVE-2018-3920?

The vulnerability in the Yi Home Camera 27US 1.8.7.0D firmware update mechanism permits the execution of unauthorized code by exploiting a CRC collision using a specific 7-Zip file.

The Impact of CVE-2018-3920

The vulnerability has a CVSS base score of 7.6, indicating a high severity issue with significant impacts on confidentiality, integrity, and availability. The attack complexity is low, requiring physical access to the device.

Technical Details of CVE-2018-3920

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability allows for the execution of unauthorized code through a CRC collision triggered by a specially crafted 7-Zip file during a firmware update.

Affected Systems and Versions

Product: Yi Technology
Version: Yi Technology Home Camera 27US 1.8.7.0D

Exploitation Mechanism

The vulnerability can be exploited by inserting an SD card containing the malicious 7-Zip file, which triggers the CRC collision and subsequent code execution.

Mitigation and Prevention

Protecting systems from CVE-2018-3920 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable firmware updates until a patch is available
Monitor for any unauthorized SD card insertions

Long-Term Security Practices

Regularly update firmware to patched versions
Implement network segmentation to limit physical access to vulnerable devices

Patching and Updates

Apply security patches provided by Yi Technology to address the vulnerability