GHSA-GRVV-H2F9-7V9C

Vulnerability from github – Published: 2022-08-30 19:54 – Updated: 2022-08-30 19:54
VLAI
Summary
gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth
Details

Impact

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.

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.

Patches

gomatrixserverlib contains a fix as of commit 723fd49 and Dendrite 0.9.3 has been updated accordingly.

Workarounds

Matrix rooms where the "events_default" power level has not been changed from the default of zero are not vulnerable.

For more information

If you have any questions or comments about this advisory, e-mail us at security@matrix.org.

Severity
5.0 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/matrix-org/dendrite"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/matrix-org/gomatrixserverlib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20220815091947-723fd495dde8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-36009"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-08-30T19:54:34Z",
    "nvd_published_at": "2022-08-19T21:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nThe 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.\n\nIn rooms where the `\"events_default\"` power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers.\n\n### Patches\n\ngomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly.\n\n### Workarounds\n\nMatrix rooms where the `\"events_default\"` power level has not been changed from the default of zero are not vulnerable.\n\n### For more information\n\nIf you have any questions or comments about this advisory, e-mail us at [security@matrix.org](mailto:security@matrix.org).",
  "id": "GHSA-grvv-h2f9-7v9c",
  "modified": "2022-08-30T19:54:34Z",
  "published": "2022-08-30T19:54:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-36009"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/gomatrixserverlib"
    },
    {
      "type": "WEB",
      "url": "https://matrix.org/docs/guides/moderation/#power-levels"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2022-0952"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth"
}



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