GHSA-5chr-wjw5-3gq4
matrix-synapse vulnerable to denial of service due to malicious server ACL events
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| PyPI | matrix-synapse | < 1.94.0 | 1.94.0 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
A malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service.
Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected.
### Patches
Server administrators are advised to upgrade to Synapse 1.94.0 or later.
### Workarounds
Rooms with malicious server ACL events can be [purged and blocked](https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version) using the admin API.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4
- https://nvd.nist.gov/vuln/detail/CVE-2023-45129
- https://github.com/matrix-org/synapse/pull/16360
- https://github.com/matrix-org/synapse/commit/f84da3c32ec74cf054e2fd6d10618aa4997cffaa
- https://github.com/matrix-org/synapse
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-199.yaml
- https://lists.fedoraproject.org/archives/list/[email protected]/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B
- https://lists.fedoraproject.org/archives/list/[email protected]/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY
- https://lists.fedoraproject.org/archives/list/[email protected]/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3
- https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version
- https://security.gentoo.org/glsa/202401-12