CVE-2022-36009

2022-08-1921:15:08

CWE-863

GitHub_M

web.nvd.nist.gov

cve-2022-36009

gomatrixserverlib

dendrite

matrix protocol

federation

power levels

user access

vulnerability

upgrade

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

8.5

Confidence

High

EPSS

0.002

Percentile

60.7%

JSON

gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the "events_default" key of the m.room.power_levels event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the "events_default" power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit 723fd49 and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the "events_default" power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.

Affected configurations

Nvd

Vulners

Node

matrixdendriteRange≤0.9.2

matrixgomatrixserverlibMatch-

VendorProductVersionCPE
matrixdendrite*cpe:2.3:a:matrix:dendrite:*:*:*:*:*:*:*:*
matrixgomatrixserverlib-cpe:2.3:a:matrix:gomatrixserverlib:-:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
matrix	dendrite	*	cpe:2.3:a:matrix:dendrite::::::::
matrix	gomatrixserverlib	-	cpe:2.3:a:matrix:gomatrixserverlib:-:::::::*

CNA Affected

[
  {
    "product": "gomatrixserverlib",
    "vendor": "matrix-org",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.9.3 for dendrite"
      },
      {
        "status": "affected",
        "version": " < 723fd49 for gomatrixserverlib"
      }
    ]
  }
]