GSD-2021-40824

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker to decrypt end-to-end encrypted messages sent by affected clients.
Aliases
Aliases
CVE-2021-40824
To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-40824",
    "description": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker to decrypt end-to-end encrypted messages sent by affected clients.",
    "id": "GSD-2021-40824"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-40824"
      ],
      "details": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker to decrypt end-to-end encrypted messages sent by affected clients.",
      "id": "GSD-2021-40824",
      "modified": "2023-12-13T01:23:25.219566Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2021-40824",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
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              "vendor_name": "n/a"
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      "data_type": "CVE",
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      "description": {
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            "value": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker to decrypt end-to-end encrypted messages sent by affected clients."
          }
        ]
      },
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      "references": {
        "reference_data": [
          {
            "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"
          },
          {
            "name": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2"
          }
        ]
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "(,1.2.2)",
          "affected_versions": "All versions before 1.2.2",
          "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-937"
          ],
          "date": "2021-09-24",
          "description": "A logic error in the room key sharing functionality of Element Android exists. This error allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.",
          "fixed_versions": [
            "1.2.2"
          ],
          "identifier": "CVE-2021-40824",
          "identifiers": [
            "CVE-2021-40824"
          ],
          "not_impacted": "All versions starting from 1.2.2",
          "package_slug": "maven/org.matrix.android/matrix-android-sdk2",
          "pubdate": "2021-09-13",
          "solution": "Upgrade to version 1.2.2 or above.",
          "title": "Use of a Broken or Risky Cryptographic Algorithm",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-40824",
            "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
          ],
          "uuid": "92f3a5f3-a9d9-4ff7-999a-2f6f87e57753"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
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        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:matrix:element:*:*:*:*:*:android:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.2.2",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:matrix:matrix-android-sdk2:*:*:*:*:*:android:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.2.2",
                "vulnerable": true
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          "ID": "CVE-2021-40824"
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        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker 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-android-sdk2/releases/tag/v1.2.2",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2"
            },
            {
              "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": "2021-09-24T17:40Z",
      "publishedDate": "2021-09-13T19:15Z"
    }
  }
}



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