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.

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.

EPSS: 0.003 (23.0th percentile) — read the EPSS interpretation.

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.

Affected products

Matrix Dendrite
Matrix-org Dendrite — versions < 0.9.8

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)

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.