title: Envoy vulnerable to OAuth2 credentials exploit with permanent validity
description: Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, a malicious client is able to construct credentials with permanent validity in some specific scenarios. This is caused by the some rare scenarios in which HMAC payload can be always valid in OAuth2 filter's check. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, avoid wildcards/prefix domain wildcards in the host's domain configuration.
problem types: CWE-116: Improper Encoding or Escaping of Output
affected:
{
vendor: envoyproxy
product: envoy
versions:
version: >= 1.26.0, < 1.26.4, status: affected
version: >= 1.25.0, < 1.25.9, status: affected
version: >= 1.24.0, < 1.24.10, status: affected
version: < 1.23.12, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 8.6
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
version: 3.1
]