CVE-2021-33621 Explained : Impact and Mitigation

A detailed overview of CVE-2021-33621, covering its description, impact, technical details, mitigation, and prevention mechanisms.

Understanding CVE-2021-33621

This section provides insights into the CVE-2021-33621 vulnerability and its implications.

What is CVE-2021-33621?

The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. Relevant to applications using untrusted user input to generate an HTTP response or create a CGI::Cookie object.

The Impact of CVE-2021-33621

The vulnerability enables HTTP response splitting, impacting the integrity of applications that process untrusted user input.

Technical Details of CVE-2021-33621

Explore the specific technical aspects related to CVE-2021-33621.

Vulnerability Description

The vulnerability in the Ruby cgi gem versions creates a scenario for HTTP response splitting, affecting CGI::Cookie object generation.

Affected Systems and Versions

All versions of the cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby are vulnerable to HTTP response splitting.

Exploitation Mechanism

An attacker can exploit this vulnerability by manipulating untrusted user input to inject malicious data into HTTP responses or CGI::Cookie objects.

Mitigation and Prevention

Learn about the steps to mitigate and prevent the CVE-2021-33621 vulnerability.

Immediate Steps to Take

Developers should update the Ruby cgi gem to the patched versions (0.1.0.2, 0.2.2, 0.3.5) to prevent HTTP response splitting attacks.

Long-Term Security Practices

Implement robust input validation mechanisms and avoid accepting untrusted user input without proper sanitization in applications.

Patching and Updates

Regularly monitor for security advisories and apply updates promptly to stay protected against known vulnerabilities.