// For flags

CVE-2022-39200

Signature checks not applied to some retrieved missing events

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.

Dendrite es un servidor doméstico de Matrix escrito en Go. En las versiones afectadas, los eventos recuperados de un servidor doméstico remoto usando la ruta "/get_missing_events" no presentaban sus firmas verificadas correctamente. Esto podría permitir que un servidor doméstico remoto proporcionara eventos no válidos/modificados a Dendrite por medio de este endpoint. Ten en cuenta que esto no es aplicado a eventos recuperados mediante otros endpoints (por ejemplo, "/event", "/state") ya que han sido correctamente verificados. Los servidores domésticos que presentan la federación deshabilitada no son vulnerables. El problema ha sido corregido en Dendrite versión 0.9.8. Es recomendado a usuarios actualizar. No se presentan mitigaciones conocidas para este problema

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-09-02 CVE Reserved
  • 2022-09-12 CVE Published
  • 2024-04-04 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-347: Improper Verification of Cryptographic Signature
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Matrix
Search vendor "Matrix"
Dendrite
Search vendor "Matrix" for product "Dendrite"
< 0.9.8
Search vendor "Matrix" for product "Dendrite" and version " < 0.9.8"
-
Affected