CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
47.9%
The Matrix specification specifies a list of event authorization rules which must be checked when determining if an event should be accepted into a room.
In versions of Synapse up to and including v1.61, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers.
Administrators of homeservers with federation enabled are advised to upgrade to v1.62.0 or higher.
federation_domain_whitelist
to an empty list ([]
).If you have any questions or comments about this advisory, e-mail us at [email protected].
github.com/matrix-org/synapse
github.com/matrix-org/synapse/pull/13087
github.com/matrix-org/synapse/pull/13088
github.com/matrix-org/synapse/releases/tag/v1.62.0
github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765
github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2022-262.yaml
nvd.nist.gov/vuln/detail/CVE-2022-31152