CVE-2021-25122 : Vulnerability Insights and Analysis
Learn about CVE-2021-25122, a vulnerability in Apache Tomcat that exposes user data due to h2c request mix-up. Find out the impact, affected versions, and steps to mitigate the issue.
A detailed overview of CVE-2021-25122, a vulnerability in Apache Tomcat related to h2c request mix-up.
Understanding CVE-2021-25122
CVE-2021-25122 is a security vulnerability in Apache Tomcat that allows for the duplication of request headers and a limited amount of request body when responding to new h2c connection requests.
What is CVE-2021-25122?
The vulnerability in Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, and 8.5.0 to 8.5.61 could lead to user information exposure as user A and user B could see the results of user A's request due to the request mix-up.
The Impact of CVE-2021-25122
The impact of this vulnerability is the potential exposure of sensitive information to unauthorized users, resulting in a breach of confidentiality and privacy.
Technical Details of CVE-2021-25122
This section covers the specifics of the vulnerability, affected systems, and how it can be exploited.
Vulnerability Description
Apache Tomcat's mishandling of new h2c connection requests results in the duplication of request data, leading to information exposure between different users.
Affected Systems and Versions
The affected versions include Apache Tomcat 10, 9, and 8.5, up to specific versions where the vulnerability exists.
Exploitation Mechanism
Attackers could exploit this vulnerability by making h2c connection requests to the affected Apache Tomcat servers, potentially accessing and viewing other users' request data.
Mitigation and Prevention
Measures to address and prevent exploitation of CVE-2021-25122
Immediate Steps to Take
It is recommended to update Apache Tomcat to a non-vulnerable version and monitor for any suspicious activity or unauthorized access.
Long-Term Security Practices
Implement secure coding practices, regularly update software, and conduct security audits to enhance the overall security posture.
Patching and Updates
Utilize security patches provided by Apache Tomcat to address the vulnerability effectively and prevent potential exploits.