Information Exposure Affecting matrix-synapse package, versions [,1.41.1)
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Test your applications- Snyk ID SNYK-PYTHON-MATRIXSYNAPSE-1579718
- published 2 Sep 2021
- disclosed 1 Sep 2021
- credit Unknown
Introduced: 1 Sep 2021
CVE-2021-39163 Open this link in a new tabHow to fix?
Upgrade matrix-synapse to version 1.41.1 or higher.
Overview
matrix-synapse is an ecosystem for open federated Instant Messaging and VoIP.
Affected versions of this package are vulnerable to Information Exposure. Unauthorised users can access the name, avatar, topic and number of members of a room if they know the ID of the room. This vulnerability is limited to homeservers where:
- the vulnerable homeserver is in the room; and
- untrusted users are permitted to create groups (communities).
By default, only homeserver administrators can create groups. However, homeserver administrators can already access this information in the database or using the admin API. As a result, only homeservers where the configuration setting enable_group_creation has been set to true are impacted.