CVE-2023-45129
MEDIUMSynapse < 1.94.0 - Denial of Service via Malicious Server ACL Event
Title source: llmDescription
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.
References (7)
Core 7
Core References
Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/
Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/
Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
Third Party Advisory
https://security.gentoo.org/glsa/202401-12
Vendor Advisory x_refsource_confirm
https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4
Patch, Vendor Advisory x_refsource_misc
https://github.com/matrix-org/synapse/pull/16360
Release Notes x_refsource_misc
https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version
Scores
CVSS v3
4.9
EPSS
0.0027
EPSS Percentile
50.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-770
Status
published
Products (4)
fedoraproject/fedora
37
fedoraproject/fedora
38
matrix/synapse
< 1.94.0
pypi/matrix-synapse
0 - 1.94.0PyPI
Published
Oct 10, 2023
Tracked Since
Feb 18, 2026