{
  "GSD": {
    "alias": "CVE-2022-39251",
    "description": "Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. Starting with version 19.7.0, matrix-js-sdk has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.",
    "id": "GSD-2022-39251",
    "references": [
      "https://advisories.mageia.org/CVE-2022-39251.html",
      "https://access.redhat.com/errata/RHSA-2022:7178",
      "https://access.redhat.com/errata/RHSA-2022:7181",
      "https://access.redhat.com/errata/RHSA-2022:7182",
      "https://access.redhat.com/errata/RHSA-2022:7183",
      "https://access.redhat.com/errata/RHSA-2022:7184",
      "https://access.redhat.com/errata/RHSA-2022:7190",
      "https://www.suse.com/security/cve/CVE-2022-39251.html",
      "https://ubuntu.com/security/CVE-2022-39251"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2022-39251"
      ],
      "details": "Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. Starting with version 19.7.0, matrix-js-sdk has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.",
      "id": "GSD-2022-39251",
      "modified": "2023-12-13T01:19:20.424335Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "TITLE": "Matrix Javascript SDK vulnerable to Olm/Megolm protocol confusion"
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          "attackComplexity": "LOW",
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          "confidentialityImpact": "NONE",
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        }
      },
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            "description": [
              {
                "lang": "eng",
                "value": "CWE-322: Key Exchange without Entity Authentication"
              }
            ]
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          {
            "description": [
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                "lang": "eng",
                "value": "CWE-287: Improper Authentication"
              }
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        "reference_data": [
          {
            "name": "https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76"
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            "url": "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0"
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            "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"
          },
          {
            "name": "https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mq2c",
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            "url": "https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mq2c"
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          {
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      "source": {
        "advisory": "GHSA-r48r-j8fx-mq2c",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c19.7.0",
          "affected_versions": "All versions before 19.7.0",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-287",
            "CWE-937"
          ],
          "date": "2022-12-03",
          "description": "Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. Starting with version 19.7.0, matrix-js-sdk has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.",
          "fixed_versions": [
            "19.7.0"
          ],
          "identifier": "CVE-2022-39251",
          "identifiers": [
            "CVE-2022-39251",
            "GHSA-r48r-j8fx-mq2c"
          ],
          "not_impacted": "All versions starting from 19.7.0",
          "package_slug": "npm/matrix-js-sdk",
          "pubdate": "2022-09-28",
          "solution": "Upgrade to version 19.7.0 or above.",
          "title": "Key Exchange without Entity Authentication",
          "urls": [
            "https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mq2c",
            "https://nvd.nist.gov/vuln/detail/CVE-2022-39251",
            "https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76",
            "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0",
            "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients",
            "https://github.com/advisories/GHSA-r48r-j8fx-mq2c"
          ],
          "uuid": "57973b56-18e2-4624-978f-888a31ebd836"
        }
      ]
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      "lastModifiedDate": "2022-12-03T01:34Z",
      "publishedDate": "2022-09-28T20:15Z"
    }
  }
}