CVE-2021-28149 : Exploit Details and Defense Strategies

This CVE-2021-28149 article provides insights into the Directory Traversal vulnerability found in Hongdian H8922 3.0.5 devices. The article explains the impact, technical details, and mitigation strategies related to this security issue.

Understanding CVE-2021-28149

In this section, we will delve into the details of the CVE-2021-28149 vulnerability affecting the Hongdian H8922 3.0.5 devices.

What is CVE-2021-28149?

Hongdian H8922 3.0.5 devices are susceptible to a Directory Traversal vulnerability. Attackers with minimal privileges can exploit this flaw to download files from the device by manipulating user input.

The Impact of CVE-2021-28149

The vulnerability allows remote attackers to perform unauthorized file downloads by injecting specific input via the log export handler. By bypassing security measures, threat actors can access sensitive files on the system.

Technical Details of CVE-2021-28149

This section covers the technical aspects of CVE-2021-28149, including the vulnerability description, affected systems, and exploitation methods.

Vulnerability Description

The flaw resides in the /log_download.cgi log export handler, which lacks proper input validation. Attackers can navigate through directories and download arbitrary files by manipulating the file name in the URL.

Affected Systems and Versions

Hongdian H8922 3.0.5 devices are confirmed to be impacted by this vulnerability. The specific version mentioned reflects the presence of the security issue.

Exploitation Mechanism

By sending crafted requests to the log_download.cgi handler, threat actors can append directory traversal sequences like ../ to access files outside the intended directory structure.

Mitigation and Prevention

This section outlines the necessary steps to mitigate the risks associated with CVE-2021-28149 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to restrict access to the affected handler and implement proper input validation mechanisms to prevent directory traversal attacks.

Long-Term Security Practices

Regular security assessments, user training on safe browsing practices, and keeping systems updated can enhance the overall security posture.

Patching and Updates

Ensure that the device firmware is up-to-date with the latest patches released by the vendor to address and mitigate the vulnerability effectively.