CVE-2021-32780
Assigner: GitHub_M
Published: 2021-08-24T20:55:10
State: PUBLISHED
affected: product: envoy
vendor: envoyproxy
versions: status: affected
version: >= 1.19.0, < 1.19.1
status: affected
version: >= 1.18.0, < 1.18.4
descriptions: value: Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it receives a GOAWAY frame without any streams outstanding. The connection state is transitioned to DRAINING when it receives a SETTING frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0. Receiving these two frames in the same I/O event results in abnormal termination of the Envoy process due to invalid state transition from CLOSED to DRAINING. A sequence of H/2 frames delivered by an untrusted upstream server will result in Denial of Service in the presence of untrusted **upstream** servers. Envoy versions 1.19.1, 1.18.4 contain fixes to stop processing of pending H/2 frames after connection transition to the CLOSED state.
metrics: cvssV3_1: attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.6
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
version: 3.1
problemTypes: descriptions: cweId: CWE-754
description: CWE-754: Improper Check for Unusual or Exceptional Conditions
type: CWE
source: advisory: GHSA-j374-mjrw-vvp8
discovery: UNKNOWN
title: Incorrect handling of H/2 GOAWAY followed by SETTINGS frames