CVE-2020-36320 Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7
Attackers can cause denial of service in Vaadin applications by submitting malicious email addresses that trigger excessive resource consumption in the EmailValidator.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-36320?
CVE-2020-36320 is a high-severity denial of service vulnerability in Vaadin, published on 23 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unsafe validation RegEx in EmailValidator class in com.vaadin:vaadin-server versions 7.0.0 through 7.7.21 (Vaadin 7.0.0 through 7.7.21) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.
Weakness: CWE-400
Which versions are affected by CVE-2020-36320?
4 open source packages ship an affected version, including com.vaadin:vaadin-bom and com.vaadin:vaadin-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.vaadin:vaadin-bom Maven | From 7.0.0.beta1 | 7.7.22 |
com.vaadin:vaadin-bom Maven | From 7.0.0.beta1 | 7.7.22 |
com.vaadin:vaadin-server Maven | From 7.0.0.beta1 | 7.7.22 |
com.vaadin:vaadin-server Maven | From 7.0.0.beta1 | 7.7.22 |
Products include Vaadin Vaadin.
How do I fix CVE-2020-36320?
Upgrade com.vaadin:vaadin-bom to 7.7.22 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-36320 being exploited?
There is no known exploitation of CVE-2020-36320 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
- CVE-2021-33611 Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14
- CVE-2023-25499 Possible information disclosure in non visible components
- CVE-2022-29567 Possible information disclosure inside TreeGrid component with default data provider
- CVE-2019-25028 Stored cross-site scripting in Grid component in Vaadin 7 and 8
Sources
Also known as GHSA-42j4-733x-5vcf.