CVE-2021-33571 Explained : Impact and Mitigation

A security vulnerability has been identified in Django versions prior to certain releases. Find out the details and impact of CVE-2021-33571 below.

Understanding CVE-2021-33571

Django versions before specific releases are found to have a security issue that could potentially impact the access control based on IP addresses.

What is CVE-2021-33571?

In Django versions prior to 2.2.24, 3.1.12, and 3.2.4, there is a flaw in URLValidator, validate_ipv4_address, and validate_ipv46_address. These functions may not prohibit leading zero characters in octal literals, potentially allowing bypass of IP address-based access control.

The Impact of CVE-2021-33571

The vulnerability could be exploited by attackers to bypass IP address-based access control mechanisms, leading to unauthorized access to the system or sensitive data.

Technical Details of CVE-2021-33571

Learn more about the specifics of this vulnerability.

Vulnerability Description

The issue arises from the inadequate validation of input in certain functions related to IP address handling.

Affected Systems and Versions

All Django versions before 2.2.24, 3.1.12, and 3.2.4 are affected by this vulnerability.

Exploitation Mechanism

By leveraging the lack of proper input validation in Django functions, malicious actors can craft requests to potentially bypass IP address-based access controls.

Mitigation and Prevention

Discover the steps to mitigate the risks associated with CVE-2021-33571.

Immediate Steps to Take

Users are advised to update Django to versions 2.2.24, 3.1.12, or 3.2.4. Additionally, review and adjust access control policies to reduce the impact of this vulnerability.

Long-Term Security Practices

Implement rigorous input validation checks in your applications and stay informed about security updates provided by Django.

Patching and Updates

Regularly check for security advisories from Django and apply patches promptly to safeguard your systems against known vulnerabilities.