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CVE-2022-39254

Published: 29 September 2022

matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
python-matrix-nio
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needs-triage)
xenial Ignored
(end of standard support)
bionic Does not exist

focal Does not exist

jammy Needs triage

trusty Ignored
(end of standard support)
upstream Needs triage

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N