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PYSEC-2023-67

Quick fix

PYSEC-2023-67 — matrix-synapse: upgrade to the fixed version with the command below.

pip install --upgrade 'matrix-synapse>=1.74.0'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/matrix-synapse

Introduced in: 0Fixed in: 1.74.0

Fixpip install --upgrade 'matrix-synapse>=1.74.0'

References

https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr[ADVISORY]
https://github.com/matrix-org/synapse/pull/14642[FIX]
https://github.com/matrix-org/synapse/issues/14492[REPORT]