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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. |
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.. | ||
controllers | ||
databases | ||
engines | ||
schema | ||
util | ||
__init__.py | ||
_base.py | ||
background_updates.py | ||
database.py | ||
keys.py | ||
prepare_database.py | ||
push_rule.py | ||
roommember.py | ||
types.py |