GHSA-9h6g-6mxg-vvp4: Vaadin bom Timing Side Channel Vulnerability Vulnerability

MODERATE
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CVSS 4.0
CWE-208
Published
Advisory Summary

GHSA-9h6g-6mxg-vvp4 is a MODERATE (CVSS 4.0) timing side channel vulnerability vulnerability (CWE-208: Observable Timing Discrepancy) affecting Vaadin bom libraries in the Maven ecosystem. The issue involves timing side channel vulnerability in endpoint request handler in vaadin 15-19. Remediation is available by upgrading affected packages to version 19.0.1, 18.0.7.

GHSA-9h6g-6mxg-vvp4 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-9h6g-6mxg-vvp4
Severity MODERATE
CVSS v3.1 Base Score 4.0
CWE Classification CWE-208: Observable Timing Discrepancy
Affected Product Vaadin bom
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix GHSA-9h6g-6mxg-vvp4

To remediate this vulnerability, upgrade all affected Vaadin bom dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

com.vaadin:vaadin-bom fixed: 19.0.1 
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-bom</artifactId>
    <version>19.0.1</version>
</dependency>
com.vaadin:vaadin-bom fixed: 18.0.7 
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-bom</artifactId>
    <version>18.0.7</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=com.vaadin

How to Check if You Are Affected

To determine whether your Java application is affected by GHSA-9h6g-6mxg-vvp4, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.vaadin

Analyze the terminal output to locate any version of Vaadin bom in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 19.0.1), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.vaadin command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-208: Observable Timing Discrepancy, where two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. In Vaadin bom, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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. - https://vaadin.com/security/cve-2021-31406

GHSA-9h6g-6mxg-vvp4 Affected Vaadin bom Versions

2 component(s)
Fixed Versions:
19.0.118.0.7
Product / Package Ecosystem Affected Versions Fixed Version
com.vaadin:vaadin-bom
maven/com.vaadin/vaadin-bom
Maven
≥ 19.0.0
< 19.0.1
All 1 versions
19.0.0
19.0.1
com.vaadin:vaadin-bom
maven/com.vaadin/vaadin-bom
Maven
≥ 15.0.0
< 18.0.7
18.0.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vaadin/platform/security/advisories/GHSA-9h6g-6mxg-vvp4
Vaadin bom Source Repository REPOSITORY
https://github.com/vaadin/platform
Vaadin bom Security Information SECURITY
https://vaadin.com/security/cve-2021-31406

Frequently Asked Questions

What is GHSA-9h6g-6mxg-vvp4?
GHSA-9h6g-6mxg-vvp4 is a security vulnerability in Vaadin bom involving Timing side channel vulnerability in endpoint request handler in Vaadin 15-19 under CWE-208: Observable Timing Discrepancy.
Which Vaadin bom versions are affected?
Affected versions include releases prior to 19.0.1, 18.0.7 across affected packages: com.vaadin:vaadin-bom.
What version fixes GHSA-9h6g-6mxg-vvp4?
Upgrading to 19.0.1, 18.0.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vaadin-bom affected?
Yes, com.vaadin:vaadin-bom is affected in releases prior to 19.0.1, 18.0.7. Upgrade your dependency to 19.0.1, 18.0.7 or later.
What is the CVSS score of GHSA-9h6g-6mxg-vvp4?
GHSA-9h6g-6mxg-vvp4 has a CVSS v3.1 base score of 4.0 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with GHSA-9h6g-6mxg-vvp4?
GHSA-9h6g-6mxg-vvp4 is classified under CWE-208: Observable Timing Discrepancy (Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.).
How can I check Maven dependencies for GHSA-9h6g-6mxg-vvp4?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.vaadin'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9h6g-6mxg-vvp4",
  "modified" : "2021-10-08T21:24:35Z",
  "published" : "2021-04-19T14:47:18Z",
  "aliases" : [ ],
  "summary" : "Timing side channel vulnerability in endpoint request handler in Vaadin 15-19",
  "details" : "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.\n\n- https://vaadin.com/security/cve-2021-31406",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.vaadin:vaadin-bom"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "19.0.0"
      }, {
        "fixed" : "19.0.1"
      } ]
    } ],
    "versions" : [ "19.0.0" ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.vaadin:vaadin-bom"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "15.0.0"
      }, {
        "fixed" : "18.0.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vaadin/platform/security/advisories/GHSA-9h6g-6mxg-vvp4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vaadin/platform"
  }, {
    "type" : "WEB",
    "url" : "https://vaadin.com/security/cve-2021-31406"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-208" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-16T23:13:06Z",
    "nvd_published_at" : null
  }
}