GSD-2021-32802

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn't suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`.
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Aliases
CVE-2021-32802
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{
  "GSD": {
    "alias": "CVE-2021-32802",
    "description": "Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn\u0027t suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`.",
    "id": "GSD-2021-32802",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-32802.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-32802"
      ],
      "details": "Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn\u0027t suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`.",
      "id": "GSD-2021-32802",
      "modified": "2023-12-13T01:23:09.248954Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ID": "CVE-2021-32802",
        "STATE": "PUBLIC",
        "TITLE": "Preview generation used third-party library not suited for user-generated content in Nextcloud server"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "security-advisories",
                    "version": {
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                          "version_value": "\u003c 20.0.12"
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                          "version_value": "\u003e= 21.0.0, \u003c 21.0.4"
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            "value": "Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn\u0027t suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L",
          "version": "3.1"
        }
      },
      "problemtype": {
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                "value": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere"
              }
            ]
          }
        ]
      },
      "references": {
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          {
            "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7",
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          },
          {
            "name": "https://hackerone.com/reports/1261413",
            "refsource": "MISC",
            "url": "https://hackerone.com/reports/1261413"
          },
          {
            "name": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews",
            "refsource": "MISC",
            "url": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews"
          },
          {
            "name": "GLSA-202208-17",
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            "url": "https://security.gentoo.org/glsa/202208-17"
          }
        ]
      },
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        "discovery": "UNKNOWN"
      }
    },
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        "nodes": [
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            "children": [],
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                "cpe23Uri": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
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                "versionStartIncluding": "21.0.0",
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        "description": {
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              "value": "Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn\u0027t suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`."
            }
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        "references": {
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            {
              "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7",
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                "Mitigation",
                "Third Party Advisory"
              ],
              "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7"
            },
            {
              "name": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews",
              "refsource": "MISC",
              "tags": [
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              "url": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews"
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      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 10.0,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 10.0,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2022-09-27T14:16Z",
      "publishedDate": "2021-09-07T22:15Z"
    }
  }
}


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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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