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Author SHA1 Message Date
Erik Johnston 55b0aa847a Fix GHSA-3h7q-rfh9-xm4v
Weakness in auth chain indexing allows DoS from remote room members
through disk fill and high CPU usage.

A remote Matrix user with malicious intent, sharing a room with Synapse
instances before 1.104.1, can dispatch specially crafted events to
exploit a weakness in how the auth chain cover index is calculated. This
can induce high CPU consumption and accumulate excessive data in the
database of such instances, resulting in a denial of service.

Servers in private federations, or those that do not federate, are not
affected.
2024-04-23 15:25:49 +01:00
Andrew Morgan db4e321219 1.105.0rc1 2024-04-11 12:16:31 +01:00
Erik Johnston ec174d0470
Refactor chain fetching (#17044)
Since these queries are duplicated in two places.
2024-04-02 15:33:56 +01:00