GHSA-9h6g-6mxg-vvp4 Timing side channel vulnerability in endpoint request handler in Vaadin 15-19
Attackers can bypass CSRF protection in Vaadin Fusion endpoints by exploiting a timing side channel to guess security tokens.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-9h6g-6mxg-vvp4?
GHSA-9h6g-6mxg-vvp4 is a vulnerability in com.vaadin:vaadin-bom, published on 19 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Non-constant-time comparison of CSRF tokens in endpoint request handler 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) allows attacker to guess a security token for Fusion endpoints via timing attack.
Which versions are affected by GHSA-9h6g-6mxg-vvp4?
4 open source packages ship an affected version, including com.vaadin:vaadin-bom.
| Package | Affected | Fixed in |
|---|---|---|
com.vaadin:vaadin-bom Maven | From 15.0.0 | 18.0.7 |
com.vaadin:vaadin-bom Maven | From 15.0.0 | 18.0.7 |
com.vaadin:vaadin-bom Maven | From 19.0.0 | 19.0.1 |
com.vaadin:vaadin-bom Maven | From 19.0.0 | 19.0.1 |
How do I fix GHSA-9h6g-6mxg-vvp4?
Upgrade com.vaadin:vaadin-bom to a fixed version for your release line: 18.0.7 or 19.0.1.
Is GHSA-9h6g-6mxg-vvp4 being exploited?
There is no known exploitation of GHSA-9h6g-6mxg-vvp4 in the wild and no public exploit code.