CVE-2021-27565 : What You Need to Know

This CVE-2021-27565 article provides insights into a denial of service vulnerability (infinite loop and networking outage) in InterNiche NicheStack web server through version 4.0.1 and its impact.

Understanding CVE-2021-27565

This section delves deeper into the details of CVE-2021-27565 and its implications.

What is CVE-2021-27565?

The vulnerability in InterNiche NicheStack web server up to version 4.0.1 enables remote attackers to trigger a denial of service attack by exploiting unexpected valid HTTP requests.

The Impact of CVE-2021-27565

Attackers can cause an infinite loop and disrupt network connectivity by sending specific HTTP requests due to a misconfiguration in the HTTP request handler.

Technical Details of CVE-2021-27565

This section elaborates on the technical aspects of CVE-2021-27565, including how systems are affected and the exploitation method.

Vulnerability Description

The issue arises due to a misconfigured wbs_loop() debugger hook in the HTTP request handler, allowing attackers to exploit the server and cause a denial of service.

Affected Systems and Versions

InterNiche NicheStack web server versions up to 4.0.1 are impacted by this vulnerability, making them susceptible to network outages.

Exploitation Mechanism

Remote threat actors can exploit the flawed HTTP request handling to trigger an infinite loop, leading to a denial of service by sending unexpected HTTP requests.

Mitigation and Prevention

In this segment, we discuss the steps to mitigate the risk posed by CVE-2021-27565 and how to enhance long-term security practices.

Immediate Steps to Take

Organizations should update NicheStack to the latest version, apply security patches, and monitor network traffic for any suspicious activities.

Long-Term Security Practices

Implementing firewall rules, intrusion detection systems, and regular security audits can help in preventing similar vulnerabilities in the future.

Patching and Updates

Regularly checking for security updates, subscribing to vendor alerts, and promptly applying patches can safeguard systems from known vulnerabilities.