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FreeBSD: VID-278561D7-B261-11EB-B788-901B0E934D69 (CVE-2021-29471): py-matrix-synapse -- malicious push rules may be used for a denial of service attack.

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FreeBSD: VID-278561D7-B261-11EB-B788-901B0E934D69 (CVE-2021-29471): py-matrix-synapse -- malicious push rules may be used for a denial of service attack.

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
05/11/2021
Created
11/08/2022
Added
11/04/2022
Modified
11/04/2022

Description

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 "Push rules" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.

Solution(s)

  • freebsd-upgrade-package-py36-matrix-synapse
  • freebsd-upgrade-package-py37-matrix-synapse
  • freebsd-upgrade-package-py38-matrix-synapse
  • freebsd-upgrade-package-py39-matrix-synapse

References

  • CVE-2021-29471

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