Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites
Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of invite_room_state, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized invite_room_state fields. Server operators should upgrade to Synapse 1.74 or newer urgently.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.74.0 | 1.74.0 |
Affected products
2- Range: < 1.74.0
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-f3wc-3vxv-xmvrghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2023-32323ghsaADVISORY
- github.com/matrix-org/synapse/issues/14492ghsax_refsource_MISCWEB
- github.com/matrix-org/synapse/pull/14642ghsax_refsource_MISCWEB
- github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvrghsax_refsource_CONFIRMWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-67.yamlghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QDghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/mitre
News mentions
0No linked articles in our index yet.