CVE-2021-31411 Insecure temporary directory usage in frontend build functionality of Vaadin 14 and 15-19

What is CVE-2021-31411?

CVE-2021-31411 is a medium-severity code injection vulnerability in Vaadin, published on 5 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Insecure temporary directory usage in frontend build functionality of com.vaadin:flow-server versions 2.0.9 through 2.5.2 (Vaadin 14.0.3 through Vaadin 14.5.2), 3.0 prior to 6.0 (Vaadin 15 prior to 19), and 6.0.0 through 6.0.5 (Vaadin 19.0.0 through 19.0.4) allows local users to inject malicious code into frontend resources during application rebuilds.

Weakness: CWE-379

Which versions are affected by CVE-2021-31411?

4 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-2021-31411?

Upgrade com.vaadin:vaadin-bom to a fixed version for your release line: 14.5.3 or 19.0.5.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-31411 being exploited?

There is no known exploitation of CVE-2021-31411 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-2021-31408 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19 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-p826-8vhq-h439.