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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXgzNDUtMzJyYy04aDg1
Denial of service attack via push rule patterns in matrix-synapse
"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 by https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c.
A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.
For more information
If you have any questions or comments about this advisory, email us at [email protected].Permalink: https://github.com/advisories/GHSA-x345-32rc-8h85
Source: GitHub Advisory Database
Published: over 2 years ago
Updated: 10 months ago
CVSS Score: 3.7
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Identifiers: GHSA-x345-32rc-8h85, CVE-2021-29471
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
Fixed in: 1.33.2