CVE-2021-31408 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19

What is CVE-2021-31408?

CVE-2021-31408 is a medium-severity authentication bypass vulnerability in Vaadin, published on 23 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through 6.0.4 (Vaadin 19.0.0 through 19.0.3) uses incorrect HTTP method, which, in combination with Spring Security CSRF protection, allows local attackers to access Fusion endpoints after the user attempted to log out.

Weakness: CWE-613

Which versions are affected by CVE-2021-31408?

2 open source packages ship an affected version, including com.vaadin:vaadin-bom. It affects 2 products.

Products include Vaadin Flow, Vaadin Vaadin.

How do I fix CVE-2021-31408?

Upgrade com.vaadin:vaadin-bom to 19.0.4 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-31408 being exploited?

There is no known exploitation of CVE-2021-31408 in the wild and no public exploit code.

Other vulnerabilities in Vaadin

• CVE-2021-31407 Server classes and resources exposure in OSGi applications using Vaadin 12-14 and 19 High 8.6
• CVE-2021-31405 Regular expression denial of service (ReDoS) in EmailField component in Vaadin 14 and 15-17 High 7.5
• CVE-2021-31411 Insecure temporary directory usage in frontend build functionality of Vaadin 14 and 15-19 Medium 6.3
• CVE-2019-25027 Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13 Medium 6.1
• CVE-2020-36321 Directory traversal in development mode handler in Vaadin 14 and 15-17 Medium 5.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mr8h-j9cv-4m8h.