Dendrite signature checks not applied to some retrieved missing events

中 5.3CVE-2022-39200 · GHSA-pfw4-xjgm-267c · GO-2022-0989 · 12/09/2022 公開 · 17/06/2026 更新

要点

CVE-2022-39200 は github.com/matrix-org/dendrite, dendrite (matrix) に影響する深刻度「中」 (CVSS 5.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.36%（全脆弱性の 29.9% より高い）。
対処：0.9.8 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/matrix-org/dendrite Go	`< 0.9.8`	`0.9.8`
dendrite matrix	`< 0.9.8`	`0.9.8`

概要

Impact

Events retrieved from a remote homeserver using /get_missing_events 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.

Patches

The problem has been fixed in Dendrite 0.9.8.

Workarounds

There are no workarounds.

Special thanks

Tulir Asokan, who spotted the issue originally.

NVD の説明

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.