Timing side channel vulnerability in endpoint request handler in Vaadin 15-19
CVE-2021-31406

4MEDIUM

Key Information:

Vendor

Vaadin

Status
Vaadin
Flow-server
Vendor
CVE Published:
23 April 2021

What is CVE-2021-31406?

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.

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Deploy the Patch

Affected Version(s)

flow-server 6.0.0

flow-server 3.0.0

Vaadin 19.0.0

References

https://vaadin.com/security/cve-2021-31406
x_refsource_MISC
https://github.com/vaadin/flow/pull/10157
x_refsource_MISC

CVSS V3.1

Score:
4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered and responsibly reported by Xhelal Likaj.
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