FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

py-matrix-synapse -- malicious push rules may be used for a denial of service attack.

Affected packages
	py36-matrix-synapse	<	1.33.2
	py37-matrix-synapse	<	1.33.2
	py38-matrix-synapse	<	1.33.2
	py39-matrix-synapse	<	1.33.2

Details

VuXML ID	278561d7-b261-11eb-b788-901b0e934d69
Discovery	2021-05-11
Entry	2021-05-11

Matrix developers report:

"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.

[source]

References

CVE Name	CVE-2021-29471
URL	https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85