CVE-2023-32323
Assigner: GitHub_M
Published: 2023-05-26T13:32:01.632Z
State: PUBLISHED
title: Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites
problemTypes: descriptions: cweId: CWE-20
description: CWE-20: Improper Input Validation
type: CWE
metrics: cvssV3_1: attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
version: 3.1
affected: vendor: matrix-org
product: synapse
versions: version: < 1.74.0
status: affected
descriptions: value: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.


source: advisory: GHSA-f3wc-3vxv-xmvr
discovery: UNKNOWN