CVE-2021-31404 : Exploit Details and Defense Strategies

A timing side channel vulnerability in the UIDL request handler affects Vaadin versions 10.0.0 through 10.0.16, 11.0.0 through 14.0.0, 14.0.0 through 14.4.6, 15.0.0 through 18.0.0, and 18.0.0 through 18.0.5.

Understanding CVE-2021-31404

This CVE involves a non-constant-time comparison of CSRF tokens in the UIDL request handler, allowing attackers to guess security tokens through a timing attack.

What is CVE-2021-31404?

It is a timing side channel vulnerability in the UIDL request handler of Vaadin versions 10 to 18, potentially revealing security tokens.

The Impact of CVE-2021-31404

With a CVSS base score of 4 (medium severity), this vulnerability could lead to information exposure through timing discrepancies, affecting confidentiality and integrity.

Technical Details of CVE-2021-31404

The vulnerability lies in the UIDL request handler of Vaadin versions listed, creating a security risk via non-constant-time CSRF token comparison.

Vulnerability Description

The issue occurs due to the insecure comparison of CSRF tokens, susceptible to timing attacks, making it possible for attackers to guess security tokens.

Affected Systems and Versions

Vaadin versions 10.0.0 to 10.0.16, 11.0.0 to 14.0.0, 14.0.0 to 14.4.6, 15.0.0 to 18.0.0, and 18.0.0 to 18.0.5 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging timing discrepancies in CSRF token comparison, compromising the security of affected systems.

Mitigation and Prevention

To address CVE-2021-31404, immediate actions should be taken to prevent potential attacks and enhance the overall security posture.

Immediate Steps to Take

Monitoring for any suspicious activities, implementing proper security controls, and applying patches promptly are essential steps to mitigate the risk.

Long-Term Security Practices

Regular security assessments, ongoing monitoring, and security awareness training can help prevent similar vulnerabilities in the future.

Patching and Updates

Ensure all affected Vaadin versions are updated with the latest security patches to remediate the vulnerability and enhance system security.