// For flags

CVE-2024-31208

Synapse's V2 state resolution weakness allows DoS from remote room members

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API.

Synapse es un servidor doméstico Matrix de código abierto. Un usuario remoto de Matrix con intenciones maliciosas, que comparte una sala con instancias de Synapse anteriores a 1.105.1, puede enviar eventos especialmente diseñados para explotar una debilidad en el algoritmo de resolución de estado V2. Esto puede inducir un alto consumo de CPU y acumular datos excesivos en la base de datos de dichas instancias, lo que resulta en una denegación de servicio. Los servidores de federaciones privadas, o aquellos que no se federan, no se ven afectados. Los administradores del servidor deben actualizar a 1.105.1 o posterior. Algunas soluciones están disponibles. Se puede prohibir a los usuarios malintencionados o a los servidores de bloqueo ACL de las salas y/o abandonar la sala y purgarla utilizando la API de administración.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-03-29 CVE Reserved
  • 2024-04-23 CVE Published
  • 2024-05-03 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Element-hq
Search vendor "Element-hq"
 Synapse
Search vendor "Element-hq" for product "Synapse"
 < 1.105.1
Search vendor "Element-hq" for product "Synapse" and version " < 1.105.1"
en
Affected