CVE-2021-38346 (GCVE-0-2021-38346)

Vulnerability from cvelistv5 – Published: 2021-10-14 15:56 – Updated: 2025-02-14 18:11
VLAI
Title
Brizy <= 2.3.11 Authenticated Unrestricted File Upload and Path Traversal
Summary
The Brizy Page Builder plugin <= 2.3.11 for WordPress allowed authenticated users to upload executable files to a location of their choice using the brizy_create_block_screenshot AJAX action. The file would be named using the id parameter, which could be prepended with "../" to perform directory traversal, and the file contents were populated via the ibsf parameter, which would be base64-decoded and written to the file. While the plugin added a .jpg extension to all uploaded filenames, a double extension attack was still possible, e.g. a file named shell.php would be saved as shell.php.jpg, and would be executable on a number of common configurations.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-14 18:11 UTC
CWE
  • CWE-79 - Cross-site Scripting (XSS)
References
Impacted products
Vendor Product Version CPE status
Brizy.io Brizy - Page Builder Affected: 2.3.11 , ≤ 2.3.11 (custom)
guessed Create a notification for this product.
Date Public
2021-10-13 00:00
Show details on NVD website

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                  "description": "CWE-79 Cross-site Scripting (XSS)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2021-10-14T15:56:57.000Z",
            "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
            "shortName": "Wordfence"
          },
          "references": [
            {
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://www.wordfence.com/blog/2021/10/multiple-vulnerabilities-in-brizy-page-builder-plugin-allow-site-takeover/"
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "Brizy \u003c= 2.3.11 Authenticated Unrestricted File Upload and Path Traversal",
          "x_generator": {
            "engine": "Vulnogram 0.0.9"
          },
          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "security@wordfence.com",
              "DATE_PUBLIC": "2021-10-13T00:00:00.000Z",
              "ID": "CVE-2021-38346",
              "STATE": "PUBLIC",
              "TITLE": "Brizy \u003c= 2.3.11 Authenticated Unrestricted File Upload and Path Traversal"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "Brizy - Page Builder",
                          "version": {
                            "version_data": [
                              {
                                "platform": "WordPress",
                                "version_affected": "\u003c=",
                                "version_name": "2.3.11",
                                "version_value": "2.3.11"
                              }
                            ]
                          }
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                    },
                    "vendor_name": "Brizy.io"
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            },
            "credit": [
              {
                "lang": "eng",
                "value": "Ramuel Gall, Wordfence"
              }
            ],
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            "data_type": "CVE",
            "data_version": "4.0",
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                  "value": "The Brizy Page Builder plugin \u003c= 2.3.11 for WordPress allowed authenticated users to upload executable files to a location of their choice using the brizy_create_block_screenshot AJAX action. The file would be named using the id parameter, which could be prepended with \"../\" to perform directory traversal, and the file contents were populated via the ibsf parameter, which would be base64-decoded and written to the file. While the plugin added a .jpg extension to all uploaded filenames, a double extension attack was still possible, e.g. a file named shell.php would be saved as shell.php.jpg, and would be executable on a number of common configurations."
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            },
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              "cvss": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              }
            },
            "problemtype": {
              "problemtype_data": [
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                      "lang": "eng",
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                  "url": "https://www.wordfence.com/blog/2021/10/multiple-vulnerabilities-in-brizy-page-builder-plugin-allow-site-takeover/"
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      "cveMetadata": {
        "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "assignerShortName": "Wordfence",
        "cveId": "CVE-2021-38346",
        "datePublished": "2021-10-14T15:56:57.210Z",
        "dateReserved": "2021-08-09T00:00:00.000Z",
        "dateUpdated": "2025-02-14T18:11:15.472Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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