element-hq/synapse · Security
Synapse Matrix has a partial room state leak via Sliding Sync
- GHSA ID
- GHSA-56w4-5538-8v8h
- CVE ID
- CVE-2024-53867
- Severity
- medium
- Published
- Updated
- CVSS
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CVSS v3
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Description
Impact
The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected.
Patches
Synapse version 1.120.1 fixes the problem.
Workarounds
Disable Sliding Sync.
References
https://github.com/matrix-org/matrix-spec-proposals/pull/4186 https://github.com/element-hq/synapse/blob/d80cd57c54427687afcb48740d99219c88a0fff1/synapse/config/experimental.py#L341-L344
For more information
If you have any questions or comments about this advisory, please email us at security at element.io.
CWEs
- CWE-497 · Exposure of Sensitive System Information to an Unauthorized Control Sphere