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matrix-org/synapse · Security

matrix-synapse vulnerable to denial of service due to malicious server ACL events

GHSA ID
GHSA-5chr-wjw5-3gq4
CVE ID
CVE-2023-45129
Severity
medium
Published
Updated
CVSS
4.9 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS v3
4.9 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS v4
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Description

Impact

A malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service.

Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected.

Patches

Server administrators are advised to upgrade to Synapse 1.94.0 or later.

Workarounds

Rooms with malicious server ACL events can be purged and blocked using the admin API.

CWEs

  • CWE-770 · Allocation of Resources Without Limits or Throttling

References

Open GitHub