GSD-2021-40823

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.
Aliases
Aliases
CVE-2021-40823
To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-40823",
    "description": "A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.",
    "id": "GSD-2021-40823",
    "references": [
      "https://security.archlinux.org/CVE-2021-40823"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-40823"
      ],
      "details": "A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.",
      "id": "GSD-2021-40823",
      "modified": "2023-12-13T01:23:25.174886Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2021-40823",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
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      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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            "lang": "eng",
            "value": "A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients."
          }
        ]
      },
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            "description": [
              {
                "lang": "eng",
                "value": "n/a"
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      "references": {
        "reference_data": [
          {
            "name": "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1"
          },
          {
            "name": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing",
            "refsource": "MISC",
            "url": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
          }
        ]
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c12.4.1",
          "affected_versions": "All versions before 12.4.1",
          "cvss_v2": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-290",
            "CWE-937"
          ],
          "date": "2023-08-08",
          "description": "There is a logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK). This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.",
          "fixed_versions": [
            "12.4.1"
          ],
          "identifier": "CVE-2021-40823",
          "identifiers": [
            "CVE-2021-40823"
          ],
          "not_impacted": "All versions starting from 12.4.1",
          "package_slug": "npm/matrix-js-sdk",
          "pubdate": "2021-09-13",
          "solution": "Upgrade to version 12.4.1 or above.",
          "title": "Use of a Broken or Risky Cryptographic Algorithm",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-40823",
            "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
          ],
          "uuid": "9ebb84bb-f7fd-40fa-9dd2-b43568919140"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "12.4.1",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
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          "ID": "CVE-2021-40823"
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-327"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1",
              "refsource": "MISC",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1"
            },
            {
              "name": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing",
              "refsource": "MISC",
              "tags": [
                "Vendor Advisory"
              ],
              "url": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-09-24T17:27Z",
      "publishedDate": "2021-09-13T19:15Z"
    }
  }
}


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