Moderate severityNVD Advisory· Published Oct 10, 2023· Updated Feb 13, 2025
matrix-synapse vulnerable to denial of service due to malicious server ACL events
CVE-2023-45129
Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, 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. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.
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 | < 1.94.0 | 1.94.0 |
Affected products
3- ghsa-coords2 versions
< 1.94.0+ 1 more
- (no CPE)range: < 1.94.0
- (no CPE)range: < 1.94.0-2.1
- Range: < 1.94.0
Patches
Vulnerability mechanics
References
14- github.com/advisories/GHSA-5chr-wjw5-3gq4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2023-45129ghsaADVISORY
- github.com/matrix-org/synapse/commit/f84da3c32ec74cf054e2fd6d10618aa4997cffaaghsaWEB
- github.com/matrix-org/synapse/pull/16360ghsax_refsource_MISCWEB
- github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4ghsax_refsource_CONFIRMWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-199.yamlghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5BghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFYghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3ghsaWEB
- matrix-org.github.io/synapse/latest/admin_api/rooms.htmlghsax_refsource_MISCWEB
- security.gentoo.org/glsa/202401-12ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/mitre
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/mitre
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/mitre
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