CVE-2021-22963 : Security Advisory and Response
CVE-2021-22963 describes a redirect vulnerability in fastify-static module < 4.2.4, allowing remote attackers to redirect users. Learn about impact, technical details, and mitigation.
A redirect vulnerability in the fastify-static module version < 4.2.4 allows remote attackers to redirect users to arbitrary websites via a double slash // followed by a domain. This issue affects fastify-static applications that set redirect: true option.
Understanding CVE-2021-22963
This CVE describes a redirect vulnerability in the fastify-static module that could be exploited by remote attackers to redirect users to malicious websites.
What is CVE-2021-22963?
CVE-2021-22963 is a security vulnerability in fastify-static module versions prior to 4.2.4 that allows attackers to perform open redirects by manipulating the URL.
The Impact of CVE-2021-22963
The vulnerability can lead to users being redirected to unintended and potentially harmful websites, risking phishing attacks and the compromise of sensitive information.
Technical Details of CVE-2021-22963
The technical details of this CVE include:
Vulnerability Description
The vulnerability arises due to insufficient validation of user-controlled input, allowing for the manipulation of the redirect behavior.
Affected Systems and Versions
The fastify-static module versions before 4.2.4 are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by including a double slash // followed by a domain in the URL to redirect users to malicious websites.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-22963, the following steps are recommended:
Immediate Steps to Take
Users should update the fastify-static module to version 4.2.4 or higher to prevent exploitation of this vulnerability. Additionally, it is advisable to review and restrict any user input that affects the URL redirection process.
Long-Term Security Practices
It is crucial to follow secure coding practices, validate and sanitize user input, and regularly update software components to address known security issues.
Patching and Updates
Regularly check for security updates and patches released by the fastify-static module maintainers. Promptly apply these updates to ensure the security of your applications.