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

7.3HIGH

Key Information:

Vendor

Matrix-org

Status
Dendrite
Vendor
CVE Published:
12 September 2022

What is 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.

Affected Version(s)

dendrite < 0.9.8

References

https://github.com/matrix-org/dendrite/security/advisorie...
x_refsource_CONFIRM
https://github.com/matrix-org/dendrite/commit/2792d0490f3...
x_refsource_MISC

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.