CVE-2021-31403 Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8

What is CVE-2021-31403?

CVE-2021-31403 is a medium-severity vulnerability in Vaadin, published on 23 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack

Weakness: CWE-203, CWE-208

Which versions are affected by CVE-2021-31403?

8 open source packages ship an affected version, including com.vaadin:vaadin-bom and com.vaadin:vaadin-server. It affects 1 product.

Products include Vaadin Vaadin.

How do I fix CVE-2021-31403?

Upgrade com.vaadin:vaadin-bom to a fixed version for your release line: 7.7.24 or 8.12.3.

Is CVE-2021-31403 being exploited?

There is no known exploitation of CVE-2021-31403 in the wild and no public exploit code.

Other vulnerabilities in Vaadin

• CVE-2021-31409 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19 High 7.5
• CVE-2020-36320 Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7 High 7.5
• CVE-2021-33611 Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14 Medium 6.1
• CVE-2023-25499 Possible information disclosure in non visible components Medium 5.7
• CVE-2022-29567 Possible information disclosure inside TreeGrid component with default data provider Medium 5.7

Sources

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

Also known as GHSA-75xc-qvxh-27f8.