pysec - pysec-2021-114

PYSEC-2021-114

Vulnerability from pysec - Published: 2021-04-19 19:15 - Updated: 2021-04-29 14:24

Details

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with javascript: URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

Impacted products

Name	purl
wagtail	pkg:pypi/wagtail

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "wagtail",
        "purl": "pkg:pypi/wagtail"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.11"
            },
            {
              "fixed": "2.11.7"
            },
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.6"
            },
            {
              "introduced": "2.12"
            },
            {
              "fixed": "2.12.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1",
        "0.2",
        "0.3",
        "0.3.1",
        "0.4",
        "0.4.1",
        "0.5",
        "0.6",
        "0.7",
        "0.8",
        "0.8.1",
        "0.8.2",
        "0.8.3",
        "0.8.4",
        "0.8.5",
        "0.8.6",
        "0.8.7",
        "0.8.8",
        "0.8.9",
        "0.8.10",
        "1.0b1",
        "1.0b2",
        "1.0rc1",
        "1.0rc2",
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        "1.4.2",
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        "1.4.4",
        "1.4.5",
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        "1.10.1",
        "1.11rc1",
        "1.11",
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        "1.12rc1",
        "1.12",
        "1.12.1",
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        "1.12.3",
        "1.12.4",
        "1.12.5",
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        "1.13rc1",
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        "2.10.2",
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        "2.11.2",
        "2.11.3",
        "2.11.4",
        "2.11.5",
        "2.11.6",
        "2.12",
        "2.12.1",
        "2.12.2",
        "2.12.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-29434",
    "GHSA-wq5h-f9p5-q7fx"
  ],
  "details": "Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).",
  "id": "PYSEC-2021-114",
  "modified": "2021-04-29T14:24:00Z",
  "published": "2021-04-19T19:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/wagtail/"
    }
  ]
}

CVE-2021-29434 (GCVE-0-2021-29434)

Vulnerability from cvelistv5 – Published: 2021-04-19 18:45 – Updated: 2024-08-03 22:02

Summary

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

Severity ?

6.1 (Medium)


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

CWE

CWE-79 - {"CWE-79":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}

Assigner

GitHub_M

References

URL

Tags

	https://github.com/wagtail/wagtail/security/advis…	x_refsource_CONFIRM
	https://pypi.org/project/wagtail/	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	wagtail	wagtail	Affected: <= 2.11.6 Affected: >= 2.12, <= 2.12.3

Show details on NVD website

JSON

To clipboard

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GHSA-WQ5H-F9P5-Q7FX

Vulnerability from github – Published: 2021-04-20 14:02 – Updated: 2024-11-19 16:02

Summary

Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields

Details

Impact

When saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with javascript: URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin.

Patches

Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

Workarounds

For sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to a wagtail_hooks.py module in any installed app:

from draftjs_exporter.dom import DOM
from wagtail.admin.rich_text.converters.html_to_contentstate import ExternalLinkElementHandler, PageLinkElementHandler
from wagtail.core import hooks
from wagtail.core.whitelist import check_url


def link_entity(props):
    id_ = props.get('id')
    link_props = {}

    if id_ is not None:
        link_props['linktype'] = 'page'
        link_props['id'] = id_
    else:
        link_props['href'] = check_url(props.get('url'))

    return DOM.create_element('a', link_props, props['children'])


@hooks.register('register_rich_text_features', order=1)
def register_link(features):
    features.register_converter_rule('contentstate', 'link', {
        'from_database_format': {
            'a[href]': ExternalLinkElementHandler('LINK'),
            'a[linktype="page"]': PageLinkElementHandler('LINK'),
        },
        'to_database_format': {
            'entity_decorators': {'LINK': link_entity}
        }
    })

Acknowledgements

Many thanks to Kevin Breen for reporting this issue.

For more information

If you have any questions or comments about this advisory:

Visit Wagtail's support channels
Email us at security@wagtail.io (if you wish to send encrypted email, the public key ID is 0x6ba1e1a86e0f8ce8)

Severity ?

6.1 (Medium)


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

8.4 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.11.6"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "wagtail"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.12.3"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "wagtail"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.12"
            },
            {
              "fixed": "2.12.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-29434"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-19T18:46:26Z",
    "nvd_published_at": "2021-04-19T19:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nWhen saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin.\n\n### Patches\nPatched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).\n\n### Workarounds\nFor sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to a `wagtail_hooks.py` module in any installed app:\n\n```python\nfrom draftjs_exporter.dom import DOM\nfrom wagtail.admin.rich_text.converters.html_to_contentstate import ExternalLinkElementHandler, PageLinkElementHandler\nfrom wagtail.core import hooks\nfrom wagtail.core.whitelist import check_url\n\n\ndef link_entity(props):\n    id_ = props.get(\u0027id\u0027)\n    link_props = {}\n\n    if id_ is not None:\n        link_props[\u0027linktype\u0027] = \u0027page\u0027\n        link_props[\u0027id\u0027] = id_\n    else:\n        link_props[\u0027href\u0027] = check_url(props.get(\u0027url\u0027))\n\n    return DOM.create_element(\u0027a\u0027, link_props, props[\u0027children\u0027])\n\n\n@hooks.register(\u0027register_rich_text_features\u0027, order=1)\ndef register_link(features):\n    features.register_converter_rule(\u0027contentstate\u0027, \u0027link\u0027, {\n        \u0027from_database_format\u0027: {\n            \u0027a[href]\u0027: ExternalLinkElementHandler(\u0027LINK\u0027),\n            \u0027a[linktype=\"page\"]\u0027: PageLinkElementHandler(\u0027LINK\u0027),\n        },\n        \u0027to_database_format\u0027: {\n            \u0027entity_decorators\u0027: {\u0027LINK\u0027: link_entity}\n        }\n    })\n```\n\n### Acknowledgements\nMany thanks to Kevin Breen for reporting this issue.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Visit Wagtail\u0027s [support channels](https://docs.wagtail.io/en/stable/support.html)\n* Email us at security@wagtail.io (if you wish to send encrypted email, the public key ID is `0x6ba1e1a86e0f8ce8`)",
  "id": "GHSA-wq5h-f9p5-q7fx",
  "modified": "2024-11-19T16:02:32Z",
  "published": "2021-04-20T14:02:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-29434"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wagtail/wagtail/commit/5c7a60977cba478f6a35390ba98cffc2bd41c8a4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wagtail/wagtail/commit/915f6ed2bd7d53154103cc4424a0f18695cdad6c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/wagtail/PYSEC-2021-114.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wagtail/wagtail"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wagtail/wagtail/compare/v2.11.6...v2.11.7"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/wagtail"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Improper validation of URLs (\u0027Cross-site Scripting\u0027) in Wagtail rich text fields"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

PYSEC-2021-114

CVE-2021-29434 (GCVE-0-2021-29434)

GHSA-WQ5H-F9P5-Q7FX

Impact

Patches

Workarounds

Acknowledgements

For more information

Tags

Sightings

Nomenclature