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[email protected]CVE-2020-26257

HistoryDec 09, 2020 - 7:15 p.m.

CVE-2020-26257

2020-12-0919:15:11

CWE-400

CWE-79

[email protected]

web.nvd.nist.gov

cve-2020-26257

matrix

synapse

injection attack

denial of service

security vulnerability

4 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:N/I:N/A:P

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

6.3 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

52.8%

JSON

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).

Affected configurations

Vulners

NVD

Node

matrix-orgsynapseRange<1.23.1

CPENameOperatorVersion
matrix:synapsematrix synapselt1.23.1

CPE	Name	Operator	Version
matrix:synapse	matrix synapse	lt	1.23.1

CNA Affected

[
  {
    "product": "synapse",
    "vendor": "matrix-org",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.23.1"
      }
    ]
  }
]