Vulnerability-Lookup

GSD-2021-21264

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 & CVE-2020-15247. An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP. Issue has been patched in Build 472 (v1.0.472) and v1.1.2. As a workaround, apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.

Aliases

CVE-2021-21264

Aliases

CVE-2021-21264

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-21264",
    "description": "October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 \u0026 CVE-2020-15247. An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write \u0026 manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write \u0026 execute arbitrary PHP. Issue has been patched in Build 472 (v1.0.472) and v1.1.2. As a workaround, apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.",
    "id": "GSD-2021-21264"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21264"
      ],
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      "id": "GSD-2021-21264",
      "modified": "2023-12-13T01:23:10.538999Z",
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          "cwe_ids": [
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            "CWE-78",
            "CWE-862",
            "CWE-937"
          ],
          "date": "2021-05-13",
          "description": "October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 \u0026 CVE-2020-15247. An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write \u0026 manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write \u0026 execute arbitrary PHP. Issue has been patched in Build 472 (v1.0.472) and v1.1.2. As a workaround, apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.",
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            "CVE-2021-21264"
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          "package_slug": "packagist/october/cms",
          "pubdate": "2021-05-04",
          "solution": "Upgrade to versions 1.0.472, 1.1.2 or above.",
          "title": "Missing Authorization",
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          ],
          "uuid": "0a853bd3-c0d2-4fd8-a97f-87a6f07f7eef"
        },
        {
          "affected_range": "\u003c=1.0.471||\u003e=1.1.0,\u003c=1.1.1",
          "affected_versions": "All versions up to 1.0.471, all versions starting from 1.1.0 up to 1.1.1",
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          "cwe_ids": [
            "CWE-1035",
            "CWE-937"
          ],
          "date": "2022-10-19",
          "description": "October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 was discovered that has the same impact as CVE-2020-26231 \u0026 CVE-2020-15247. An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write \u0026 manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write \u0026 execute arbitrary PHP.",
          "fixed_versions": [
            "1.0.472",
            "1.1.2"
          ],
          "identifier": "CVE-2021-21264",
          "identifiers": [
            "CVE-2021-21264",
            "GHSA-fcr8-6q7r-m4wg"
          ],
          "not_impacted": "All versions after 1.0.471 before 1.1.0, all versions after 1.1.1",
          "package_slug": "packagist/october/october",
          "pubdate": "2021-05-03",
          "solution": "Upgrade to versions 1.0.472, 1.1.2 or above.",
          "title": "Missing Authorization",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-21264"
          ],
          "uuid": "667d5ea5-25a1-4b3d-bd4c-0d59c68dd54c"
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            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.4,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 3.4,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
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            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
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            "version": "3.1"
          },
          "exploitabilityScore": 1.1,
          "impactScore": 3.7
        }
      },
      "lastModifiedDate": "2022-10-19T19:04Z",
      "publishedDate": "2021-05-03T16:15Z"
    }
  }
}

CVE-2021-21264 (GCVE-0-2021-21264)

Vulnerability from cvelistv5 – Published: 2021-05-03 16:00 – Updated: 2024-08-03 18:09

Title

Bypass of fix for CVE-2020-26231, Twig sandbox escape

Summary

Severity

5.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7886 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/octobercms/october/security/ad…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
octobercms	october	Affected: 1.0.471 Affected: 1.1.1

Show details on NVD website

JSON

To clipboard

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        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:09:14.926Z",
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            "url": "https://github.com/octobercms/october/security/advisories/GHSA-fcr8-6q7r-m4wg"
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        ],
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            {
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        "discovery": "UNKNOWN"
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      "title": "Bypass of fix for CVE-2020-26231, Twig sandbox escape",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-21264",
    "datePublished": "2021-05-03T16:00:18.000Z",
    "dateReserved": "2020-12-22T00:00:00.000Z",
    "dateUpdated": "2024-08-03T18:09:14.926Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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