What is CVE-2022-39200?

CVE-2022-39200 is a vulnerability in the Matrix homeserver Dendrite that allows a remote homeserver to provide invalid/modified events via the `/get_missing_events` path.

What is the severity of CVE-2022-39200?

The severity of CVE-2022-39200 is high with a CVSS score of 5.3.

Which versions of Dendrite are affected by CVE-2022-39200?

Versions up to exclusive of 0.9.8 of Dendrite are affected by CVE-2022-39200.

How do I fix CVE-2022-39200?

To fix CVE-2022-39200, update your Dendrite Matrix homeserver to a version higher than 0.9.8.

Vulnerability/
CVE-2022-39200

high

7.3

CWE

347

12/9/2022

3/8/2024

CVE-2022-39200: Signature checks not applied to some retrieved missing events

Q: How can this vulnerability affect me?

This vulnerability can potentially allow a remote homeserver to provide invalid/modified events to your Dendrite Matrix homeserver.

First published: Mon Sep 12 2022(Updated: )

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.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Matrix Dendrite	<0.9.8

Remedy

https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is CVE-2022-39200?
CVE-2022-39200 is a vulnerability in the Matrix homeserver Dendrite that allows a remote homeserver to provide invalid/modified events via the `/get_missing_events` path.
What is the severity of CVE-2022-39200?
The severity of CVE-2022-39200 is high with a CVSS score of 5.3.
How can this vulnerability affect me?
This vulnerability can potentially allow a remote homeserver to provide invalid/modified events to your Dendrite Matrix homeserver.
Which versions of Dendrite are affected by CVE-2022-39200?
Versions up to exclusive of 0.9.8 of Dendrite are affected by CVE-2022-39200.
How do I fix CVE-2022-39200?
To fix CVE-2022-39200, update your Dendrite Matrix homeserver to a version higher than 0.9.8.

collector/nvd-index
agent/type
agent/references
agent/softwarecombine
collector/mitre-cve
source/MITRE
agent/last-modified-date
agent/author
agent/severity
agent/remedy
agent/weakness
agent/title
agent/description
agent/first-publish-date
agent/event
agent/tags
vendor/matrix
canonical/matrix dendrite

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.