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.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Matrix-nio | Matrix-nio_project | * | 0.20 (excluding) |
| Python-matrix-nio | Ubuntu | kinetic | * |
| Python-matrix-nio | Ubuntu | lunar | * |
| Python-matrix-nio | Ubuntu | mantic | * |
| Python-matrix-nio | Ubuntu | trusty | * |
| Python-matrix-nio | Ubuntu | xenial | * |