FKIE_CVE-2021-41179

Vulnerability from fkie_nvd - Published: 2021-10-25 22:15 - Updated: 2024-11-21 06:25
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
Nextcloud is an open-source, self-hosted productivity platform. Prior to Nextcloud Server versions 20.0.13, 21.0.5, and 22.2.0, the Two-Factor Authentication wasn't enforced for pages marked as public. Any page marked as `@PublicPage` could thus be accessed with a valid user session that isn't authenticated. This particularly affects the Nextcloud Talk application, as this could be leveraged to gain access to any private chat channel without going through the Two-Factor flow. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.
References
security-advisories@github.comhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-rc6f-px23Third Party Advisory
security-advisories@github.comhttps://github.com/nextcloud/server/pull/28725Patch, Third Party Advisory
security-advisories@github.comhttps://hackerone.com/reports/1322865Permissions Required
af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-rc6f-px23Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/server/pull/28725Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/1322865Permissions Required
Impacted products
Vendor Product Version
nextcloud server *
nextcloud server *
nextcloud server *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nextcloud:server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8CF59A46-813A-4F63-A748-B4B1787475A6",
              "versionEndExcluding": "20.0.13",
              "versionStartIncluding": "20.0.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nextcloud:server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B8DBD42A-4D0B-4E74-9658-29325664880A",
              "versionEndExcluding": "21.0.5",
              "versionStartIncluding": "21.0.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nextcloud:server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FABD6E21-6B12-460A-AA56-85C83D641E4E",
              "versionEndExcluding": "22.2.0",
              "versionStartIncluding": "22.1.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud is an open-source, self-hosted productivity platform. Prior to Nextcloud Server versions 20.0.13, 21.0.5, and 22.2.0, the Two-Factor Authentication wasn\u0027t enforced for pages marked as public. Any page marked as `@PublicPage` could thus be accessed with a valid user session that isn\u0027t authenticated. This particularly affects the Nextcloud Talk application, as this could be leveraged to gain access to any private chat channel without going through the Two-Factor flow. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading."
    },
    {
      "lang": "es",
      "value": "Nextcloud es una plataforma de productividad de c\u00f3digo abierto y auto-alojada. Nextcloud Server versiones 20.0.13, 21.0.5 y 22.2.0, la autenticaci\u00f3n de dos factores no se aplicaba a las p\u00e1ginas marcadas como p\u00fablicas. Por lo tanto, se pod\u00eda acceder a cualquier p\u00e1gina marcada como \"@PublicPage\" con una sesi\u00f3n de usuario v\u00e1lida que no estuviera autenticada. Esto afecta especialmente a la aplicaci\u00f3n Nextcloud Talk, ya que podr\u00eda aprovecharse para acceder a cualquier canal de chat privado sin pasar por el flujo de dos factores. Es recomendado actualizar el servidor Nextcloud a la versi\u00f3n 20.0.13, 21.0.5 o 22.2.0. No se presentan soluciones conocidas aparte de la actualizaci\u00f3n"
    }
  ],
  "id": "CVE-2021-41179",
  "lastModified": "2024-11-21T06:25:41.217",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "NONE",
          "baseScore": 4.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2021-10-25T22:15:07.990",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-rc6f-px23"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nextcloud/server/pull/28725"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://hackerone.com/reports/1322865"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-rc6f-px23"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nextcloud/server/pull/28725"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://hackerone.com/reports/1322865"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-304"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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