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GHSA-w9fg-xffh-p362
No affected components available
Impact
Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.
Patches
The issue is fixed by #9321.
Workarounds
Depending on the needs and configuration of the homeserver a few options are available:
-
Using email as third-party identifiers be disabled by not configuring the
emailsetting. -
Using phone numbers as third-party identifiers can be disabled by ensuring that
account_threepid_delegates.msisdnis not configured. -
Additionally, the affected endpoint patterns can be blocked at a reverse proxy:
^/_matrix/client/(r0|unstable)/register/email^/_matrix/client/(r0|unstable)/register/msisdn^/_matrix/client/(r0|unstable)/account/password^/_matrix/client/(r0|unstable)/account/3pid
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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