High severityNVD Advisory· Published May 26, 2023· Updated Feb 13, 2025
Synapse Denial of service due to incorrect application of event authorization rules during state resolution
CVE-2022-39374
Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | >= 1.62.0, < 1.68.0rc1 | 1.68.0rc1 |
Affected products
2- Range: >= 1.62.0, < 1.68.0
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-p9qp-c452-f9r7ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2022-39374ghsaADVISORY
- github.com/matrix-org/synapse/commit/b73cbb82157d9666e8d667733afebc0d09ed858cghsaWEB
- github.com/matrix-org/synapse/pull/13723ghsax_refsource_MISCWEB
- github.com/matrix-org/synapse/security/advisories/GHSA-p9qp-c452-f9r7ghsax_refsource_CONFIRMWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-66.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
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