CVE-2020-36319 : Exploit Details and Defense Strategies

A vulnerability in Vaadin 15 and flow-server versions 3.0.0 through 3.0.5 could lead to sensitive data exposure.

Understanding CVE-2020-36319

This CVE involves an insecure configuration in Vaadin 15 and flow-server versions, potentially exposing sensitive data.

What is CVE-2020-36319?

The vulnerability arises from an insecure default ObjectMapper configuration in Vaadin 15 and flow-server versions, which may expose sensitive data if certain conditions are met.

The Impact of CVE-2020-36319

The vulnerability has a low severity base score of 3.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N) with a high attack complexity and network-based attack vector. It could lead to the exposure of sensitive information.

Technical Details of CVE-2020-36319

This section provides technical details of the CVE.

Vulnerability Description

The insecure configuration of the default ObjectMapper in com.vaadin:flow-server versions 3.0.0 through 3.0.5 (Vaadin 15.0.0 through 15.0.4) may expose sensitive data if the application also uses e.g. @RestController.

Affected Systems and Versions

Product: Vaadin
Vendor: Vaadin
Versions Affected: 15.0.0 to 15.0.4
Product: flow-server
Vendor: Vaadin
Versions Affected: 3.0.0 to 3.0.5

Exploitation Mechanism

The vulnerability can be exploited if the application uses @RestController in conjunction with the affected versions, potentially leading to data exposure.

Mitigation and Prevention

Protect your systems from CVE-2020-36319 with the following steps:

Immediate Steps to Take

Update Vaadin and flow-server to patched versions.
Review and restrict access to sensitive data.
Monitor and audit data access.

Long-Term Security Practices

Regularly update and patch software components.
Implement secure coding practices.
Conduct security assessments and audits.

Patching and Updates

Apply security patches provided by Vaadin promptly.