Vulnerability Details : 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.
Products affected by CVE-2022-39200
- cpe:2.3:a:matrix:dendrite:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2022-39200
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 25 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2022-39200
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
NIST | |
|
7.3
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
3.9
|
3.4
|
GitHub, Inc. |
CWE ids for CVE-2022-39200
-
The product does not verify, or incorrectly verifies, the cryptographic signature for data.Assigned by: security-advisories@github.com (Primary)
References for CVE-2022-39200
-
https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c
Signature checks not applied to some retrieved missing events · Advisory · matrix-org/dendrite · GitHubThird Party Advisory
-
https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3
Fix missing signature check on the `/get_missing_events` response · matrix-org/dendrite@2792d04 · GitHubPatch;Third Party Advisory
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