CVE-2023-45129

matrix-synapse vulnerable to denial of service due to malicious server ACL events

Severity Score

4.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Synapse es un servidor doméstico Matrix de código abierto escrito y mantenido por la Fundación Matrix.org. Antes de la versión 1.94.0, un evento de ACL de servidor malicioso podía afectar el rendimiento de forma temporal o permanente y provocar una denegación de servicio persistente. Los servidores domésticos que se ejecutan en una federación cerrada (que presumiblemente no necesitan usar ACL de servidor) no se ven afectados. Se recomienda a los administradores del servidor que actualicen a Synapse 1.94.0 o posterior. Como workaround, las salas con eventos de ACL de servidor maliciosos se pueden eliminar y bloquear mediante la API de administración.

Multiple vulnerabilities have been found in Synapse, the worst of which could result in information leaks. Versions greater than or equal to 1.96.0 are affected.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Multiple

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-10-04 CVE Reserved
2023-10-10 CVE Published
2025-02-13 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (7)

URL	Tag	Source
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B	Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3	Mailing List
https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version	Release Notes
https://security.gentoo.org/glsa/202401-12

URL	Date	SRC

URL	Date	SRC
https://github.com/matrix-org/synapse/pull/16360	2024-01-07

URL	Date	SRC
https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4	2024-01-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Matrix Search vendor "Matrix"		Synapse Search vendor "Matrix" for product "Synapse"				< 1.94.0 Search vendor "Matrix" for product "Synapse" and version " < 1.94.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				37 Search vendor "Fedoraproject" for product "Fedora" and version "37"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				38 Search vendor "Fedoraproject" for product "Fedora" and version "38"		-		Affected