MEDIUM 5.3

PYSEC-2023-230

Details

Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.

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Affected packages

PyPI / matrix-synapse

Introduced in: 0 Fixed in: daec55e1fe120c564240c5386e77941372bf458f

Fix pip install --upgrade 'matrix-synapse>=daec55e1fe120c564240c5386e77941372bf458f'

References

https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575 [ADVISORY]
https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f [FIX]