CVE-2021-31406 Explained : Impact and Mitigation
Understand the impact of CVE-2021-31406, a timing side channel vulnerability affecting Vaadin 15-19. Learn about the vulnerability, affected systems, exploitation, and mitigation steps.
A detailed overview of CVE-2021-31406, a timing side channel vulnerability affecting Vaadin 15-19 and the implications it carries.
Understanding CVE-2021-31406
This section delves into the nature of the vulnerability and its impact on systems.
What is CVE-2021-31406?
The vulnerability involves a non-constant-time comparison of CSRF tokens in the endpoint request handler of certain Vaadin products. Attackers can exploit this to guess security tokens for Fusion endpoints through a timing attack.
The Impact of CVE-2021-31406
With a CVSS base score of 4, the vulnerability has a medium severity level. It can lead to information exposure through timing discrepancies, affecting the confidentiality and integrity of systems.
Technical Details of CVE-2021-31406
Explore the specifics of the vulnerability, including affected systems and exploitation mechanisms.
Vulnerability Description
The issue lies in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6) and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0), where CSRF token comparisons are susceptible to timing attacks.
Affected Systems and Versions
Vaadin versions 15.0.0 to 18.0.6 and 19.0.0, as well as flow-server versions 3.0.0 to 5.0.3, are impacted by this vulnerability.
Exploitation Mechanism
Attackers with local access can exploit this vulnerability without requiring any special privileges, potentially compromising system integrity.
Mitigation and Prevention
Learn about the steps to mitigate the risks posed by CVE-2021-31406 and safeguard your systems.
Immediate Steps to Take
Users are advised to update affected Vaadin products to patched versions to prevent exploitation of the vulnerability.
Long-Term Security Practices
Implementing secure coding practices and regular security assessments can help prevent similar vulnerabilities in the future.
Patching and Updates
Regularly check for security updates from Vaadin and apply patches promptly to address known security issues.