title: Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8
description: Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) 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: 8.0.0, status: affected], lessThan: *, status: affected, version: 7.0.0, versionType: custom
}
{
product: vaadin-server
vendor: Vaadin
versions:
changes: [at: 8.0.0, status: affected], lessThan: *, status: affected, version: 7.0.0, 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
]