PYSEC-2020-236: matrix-synapse fixed in 3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b and 1.23.1

PYSEC-2020-236 PUBLISHED CVSS 6.900000095367432 MEDIUM

Record from OSV · Published December 9, 2020

matrix-synapse is fixed in 3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b and 1.23.1 (PyPI)

Matrix 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`).

Fixed versions

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Package	Ecosystem	Fixed in
matrix-synapse	PyPI	3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b, 1.23.1

Risk scores

CVSS 4.0

6.900000095367432

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected products

Vendor	Product	Versions
PyPI	matrix-synapse	0, 0, 0.33.5

Timeline

Dec 9, 2020 CVE Published
Nov 8, 2023 CVE Updated

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vulnetix vdb vuln PYSEC-2020-236
vulnetix vdb fixes PYSEC-2020-236

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  "https://api.vdb.vulnetix.com/v2/vuln/PYSEC-2020-236/fixes/registry"

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References

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