CVE-2021-21330 : What You Need to Know

Aiohttp before version 3.7.4 is affected by an open redirect vulnerability. This security flaw could allow a crafted link to redirect the browser to a different website. The issue resides in the

aiohttp.web_middlewares.normalize_path_middleware

middleware.

Understanding CVE-2021-21330

This CVE involves an open redirect vulnerability in aiohttp, affecting versions below 3.7.4.

What is CVE-2021-21330?

CVE-2021-21330 is an open redirect vulnerability in aiohttp, allowing malicious links to redirect users to unintended websites.

The Impact of CVE-2021-21330

The vulnerability has a CVSS base score of 3.1 (Low severity) with high attack complexity. A successful exploit could lead to user redirection to malicious sites.

Technical Details of CVE-2021-21330

The technical details include vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability is caused by a flaw in the

normalize_path_middleware

of aiohttp, enabling URL redirection to untrusted sites.

Affected Systems and Versions

Aiohttp versions prior to 3.7.4 are affected by this open redirect vulnerability.

Exploitation Mechanism

By manipulating crafted links, attackers can exploit the vulnerability to redirect users to malicious websites.

Mitigation and Prevention

Learn how to address and prevent the CVE-2021-21330 vulnerability in aiohttp.

Immediate Steps to Take

Upgrade to aiohttp version 3.7.4 or higher to mitigate the open redirect issue. Alternatively, avoid using the affected middleware if upgrading is not feasible.

Long-Term Security Practices

Regularly update dependencies, implement secure coding practices, and conduct security assessments to mitigate similar vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches and updates to ensure a secure aiohttp implementation.