CVE-2020-26257 – matrix-synapse

Package

Manager: pip
Name: matrix-synapse
Vulnerable Version: >=0 <1.23.1

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00663 pctl0.70292

Details

Denial of service attack via incorrect parameters in Matrix Synapse ### Impact A malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or `/exchange_third_party_invite` request. This can lead to a denial of service in which future events will not be correctly sent to other servers over federation. This affects any server which accepts federation requests from untrusted servers. ### Patches Issue is resolved by https://github.com/matrix-org/synapse/pull/8776. ### Workarounds Homeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).

Metadata

Created: 2020-12-09T18:21:29Z
Modified: 2024-09-24T17:44:50Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/12/GHSA-hxmp-pqch-c8mm/GHSA-hxmp-pqch-c8mm.json
CWE IDs: ["CWE-400", "CWE-74", "CWE-79"]
Alternative ID: GHSA-hxmp-pqch-c8mm
Finding: F002
Auto approve: 1