CVE-2023-43796 Synapse vulnerable to leak of remote user device information

2023-10-3116:52:48

CWE-200

GitHub_M

www.cve.org

synapse

open-source

matrix

homeserver

remote user

device information

vulnerability

upgrade

patch

federation traffic

system administrators

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

5.3 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

44.0%

JSON

Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the federation_domain_whitelist can be used to limit federation traffic with a homeserver.

CNA Affected

[
  {
    "vendor": "matrix-org",
    "product": "synapse",
    "versions": [
      {
        "version": "< 1.95.1",
        "status": "affected"
      }
    ]
  }
]