CVE-2020-26257

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Summary

CVECVE-2020-26257
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-12-09 19:15:00 UTC
Updated2023-11-07 03:20:00 UTC
DescriptionMatrix is an ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference "homeserver" implementation of Matrix. A malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or `/exchange_third_party_invite` request. This can lead to a denial of service in which future events will not be correctly sent to other servers over federation. This affects any server which accepts federation requests from untrusted servers. The Matrix Synapse reference implementation before version 1.23.1 the implementation is vulnerable to this injection attack. Issue is fixed in version 1.23.1. As a workaround homeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).

Risk And Classification

Problem Types: CWE-400

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 32 All All All
Operating System Fedoraproject Fedora 33 All All All
Application Matrix Synapse All All All All
Application Matrix Synapse All All All All

References

ReferenceSourceLinkTags
Denial of service attack via incorrect parameters to federation APIs · Advisory · matrix-org/synapse · GitHub CONFIRM github.com Third Party Advisory
[SECURITY] Fedora 33 Update: matrix-synapse-1.24.0-1.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Consistently use room_id from federation request body (#8776) · matrix-org/synapse@3ce2f30 · GitHub MISC github.com Patch, Third Party Advisory
[SECURITY] Fedora 33 Update: matrix-synapse-1.24.0-1.fc33 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
[SECURITY] Fedora 32 Update: matrix-synapse-1.24.0-1.fc32 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
Consistently use room_id from federation request body by richvdh · Pull Request #8776 · matrix-org/synapse · GitHub MISC github.com Patch, Third Party Advisory
[SECURITY] Fedora 32 Update: matrix-synapse-1.24.0-1.fc32 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
synapse/CHANGES.md at develop · matrix-org/synapse · GitHub MISC github.com Release Notes, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 501693 Alpine Linux Security Update for synapse
  • 690432 Free Berkeley Software Distribution (FreeBSD) Security Update for py-matrix-synapse (cfa0be42-3cd7-11eb-9de7-641c67a117d8)
  • 983225 Python (pip) Security Update for matrix-synapse (GHSA-hxmp-pqch-c8mm)

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