QID 980490

QID 980490: Python (pip) Security Update for matrix-synapse (GHSA-jj53-8fmw-f2w2)

Security update has been released for matrix-synapse to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

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.

  • CVSS V3 rated as Medium - 3.1 severity.
  • CVSS V2 rated as Medium - 3.5 severity.
    • Solution
    Server administrators should upgrade to 1.41.1 or higher.Workaround:
    Server administrators can set `enable_group_creation` to `false` in their homeserver configuration (this is the default value) to prevent creation of groups by non-administrators.

    Administrators that are using a reverse proxy could, with partial loss of group functionality, block the following endpoints:
    * `/_matrix/client/r0/groups/{group_id}/rooms`
    * `/_matrix/client/unstable/groups/{group_id}/rooms`
    Vendor References

    CVEs related to QID 980490

    CVE-2021-39163 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-jj53-8fmw-f2w2 matrix-synapse URL Logo github.com/advisories/GHSA-jj53-8fmw-f2w2
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