Matrix Synapse before 1.20.0 erroneously permits non-standard NaN, Infinity, and -Infinity JSON values in fields of m.room.member events, allowing remote attackers to execute a denial of service attack against the federation and common Matrix clients. If such a malformed event is accepted into the room's state, the impact is long-lasting and is not fixed by an upgrade to a newer version, requiring the event to be manually redacted instead. Since events are replicated to servers of other room members, the impact is not constrained to the server of the event sender.
Advisories
Source ID Title
EUVD EUVD EUVD-2020-0107 Matrix Synapse before 1.20.0 erroneously permits non-standard NaN, Infinity, and -Infinity JSON values in fields of m.room.member events, allowing remote attackers to execute a denial of service attack against the federation and common Matrix clients. If such a malformed event is accepted into the room's state, the impact is long-lasting and is not fixed by an upgrade to a newer version, requiring the event to be manually redacted instead. Since events are replicated to servers of other room members, the impact is not constrained to the server of the event sender.
Github GHSA Github GHSA GHSA-4mp3-385r-v63f Denial of service attack due to invalid JSON
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-04T16:03:22.703Z

Reserved: 2020-10-08T00:00:00

Link: CVE-2020-26890

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-11-24T03:15:13.120

Modified: 2024-11-21T05:20:25.257

Link: CVE-2020-26890

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.