Sydent is a reference Matrix identity server. Sydent does not limit the size of requests it receives from HTTP clients. A malicious user could send an HTTP request with a very large body, leading to memory exhaustion and denial of service. Sydent also does not limit response size for requests it makes to remote Matrix homeservers. A malicious homeserver could return a very large response, again leading to memory exhaustion and denial of service. This affects any server which accepts registration requests from untrusted clients. This issue has been patched by releases 89071a1, 0523511, f56eee3. As a workaround request sizes can be limited in an HTTP reverse-proxy. There are no known workarounds for the problem with overlarge responses.
References
Link | Resource |
---|---|
https://github.com/matrix-org/sydent/commit/0523511d2fb40f2738f8a8549868f44b96e5dab7 | Patch Third Party Advisory |
https://github.com/matrix-org/sydent/commit/89071a1a754c69a50deac89e6bb74002d4cda19d | Patch Third Party Advisory |
https://github.com/matrix-org/sydent/commit/f56eee315b6c44fdd9f6aa785cc2ec744a594428 | Patch Third Party Advisory |
https://github.com/matrix-org/sydent/releases/tag/v2.3.0 | Release Notes Third Party Advisory |
https://github.com/matrix-org/sydent/security/advisories/GHSA-wmg4-8cp2-hpg9 | Patch Third Party Advisory |
https://pypi.org/project/matrix-sydent/ | Product Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2021-04-15T20:35:19
Updated: 2021-04-15T20:35:19
Reserved: 2021-03-30T00:00:00
Link: CVE-2021-29430
JSON object: View
NVD Information
Status : Analyzed
Published: 2021-04-15T21:15:17.413
Modified: 2022-08-03T10:13:56.370
Link: CVE-2021-29430
JSON object: View
Redhat Information
No data.