Vulnerability in Matrix Dendrite
CVE-2022-39200
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (27.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Matrix Dendrite
- Matrix-Org Dendrite — versions < 0.9.8
Weakness classification (CWE)
References
- github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c (Third Party Advisory)
- github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-39200?
- CVE-2022-39200 is a high-severity vulnerability in Matrix Dendrite, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.3/10. Published 2022-09-12.
- How severe is CVE-2022-39200?
- High severity. CVSS v3 base score is 7.3 out of 10.