CVE-2022-39200CWE-347

Signature checks not applied to some retrieved missing events

High · published September 12, 2022

CVSS v3.1
7.3
EPSS
0%
Percentile
28.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00361 · 28.7th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2022-09-12T20:10Z
EPSS history
Timeline
  • 12 SEP 20:10Z
    Signature checks not applied to some retrieved missing events
    cvelistv5