CVE-2022-39254
High
Description
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.
SeverityHigh
CVSS8.6
Exploit probability—
ProductMatrix-nio
PublishedSep 29, 2022
First seenSep 29, 2022
Weakness typeCWE-322CWE-322CWE-287Improper authentication
How to fix
Update
- matrix-nio_project matrix-nio0.20 or later
- matrix-nio0.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix-nio_project matrix-nio | v < 0.20 | 0.20 |
| matrix-nioPyPI | v < 0.20 | 0.20 |
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