CVE-2023-42453 Improper validation of receipts allows forged read receipts in matrix synapse

2023-09-2620:49:23

CWE-285

GitHub_M

www.cve.org

cve-2023-42453

matrix synapse

open-source

validation

read receipts

forged

patched

upgrade

3.1 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

4.7 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

25.1%

JSON

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, even if they are not in the room. This issue has been patched in version 1.93.0. Users are advised to upgrade. There are no known workarounds for this issue.

CNA Affected

[
  {
    "vendor": "matrix-org",
    "product": "synapse",
    "versions": [
      {
        "version": ">= 0.34.0, < 1.93.0",
        "status": "affected"
      }
    ]
  }
]