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[email protected]CVE-2021-39164

HistoryAug 31, 2021 - 5:15 p.m.

CVE-2021-39164

2021-08-3117:15:08

CWE-863

CWE-200

[email protected]

web.nvd.nist.gov

matrix

instant messaging

voice over ip

cve-2021-39164

vulnerability

patch

security advisory

3.5 Low

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

3.1 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

3.6 Low

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

35.8%

JSON

Matrix is an ecosystem for open federated Instant Messaging and Voice over IP. In versions 1.41.0 and prior, unauthorised users can access the membership (list of members, with their display names) of a room if they know the ID of the room. The vulnerability is limited to rooms with shared history visibility. Furthermore, the unauthorised user must be using an account on a vulnerable homeserver that is in the room. Server administrators should upgrade to 1.41.1 or later in order to receive the patch. One workaround is available. Administrators of servers that use a reverse proxy could, with potentially unacceptable loss of functionality, block the endpoints: /_matrix/client/r0/rooms/{room_id}/members with at query parameter, and /_matrix/client/unstable/rooms/{room_id}/members with at query parameter.

Affected configurations

Vulners

NVD

Node

matrix-orgsynapseRange<1.41.1

CPENameOperatorVersion
matrix:synapsematrix synapselt1.41.1

CPE	Name	Operator	Version
matrix:synapse	matrix synapse	lt	1.41.1

CNA Affected

[
  {
    "product": "synapse",
    "vendor": "matrix-org",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.41.1"
      }
    ]
  }
]