title: Timing side channel vulnerability in UIDL request handler in Vaadin 10, 11-14, and 15-18
description: Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:flow-server versions 1.0.0 through 1.0.13 (Vaadin 10.0.0 through 10.0.16), 1.1.0 prior to 2.0.0 (Vaadin 11 prior to 14), 2.0.0 through 2.4.6 (Vaadin 14.0.0 through 14.4.6), 3.0.0 prior to 5.0.0 (Vaadin 15 prior to 18), and 5.0.0 through 5.0.2 (Vaadin 18.0.0 through 18.0.5) allows attacker to guess a security token via timing attack.
problem types: CWE-208 Information Exposure Through Timing Discrepancy
affected:
{
product: Vaadin
vendor: Vaadin
versions:
changes: [at: 11.0.0, status: affected], lessThan: *, status: affected, version: 10.0.0, versionType: custom
}
{
product: flow-server
vendor: Vaadin
versions:
changes: [at: 1.1.0, status: affected], lessThan: *, status: affected, version: 1.0.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: LOCAL
availabilityImpact: NONE
baseScore: 4
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
version: 3.1
]