CVE-2020-26257

 

Published at: - 09-12-2020 08:15

Last modified: - 12-10-2022 04:01

Total changes: - 2

Description

Matrix is an ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference "homeserver" implementation of Matrix. 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. The Matrix Synapse reference implementation before version 1.23.1 the implementation is vulnerable to this injection attack. Issue is fixed in version 1.23.1. As a workaround homeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/matrix-org/synapse/security/advisories/GHSA-hxmp-pqch-c8mm
• https://github.com/matrix-org/synapse/commit/3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b
• https://github.com/matrix-org/synapse/blob/develop/CHANGES.md#synapse-1231-2020-12-09
• https://github.com/matrix-org/synapse/pull/8776
• FEDORA-2020-a2172c484d-Mailing List, Third Party Advisory
• FEDORA-2020-eeb66c2ece-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2020-26257

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures