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.

*Credits: N/A

CVSS Scores

NISTv3.1 4.9

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* 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
2024-08-02 CVE Updated
2024-10-16 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