Vulnerability-Lookup

GSD-2021-22881

Vulnerability from gsd - Updated: 2021-02-10 00:00

Details

There is a possible open redirect vulnerability in the Host Authorization middleware in Action Pack. This vulnerability has been assigned the CVE identifier CVE-2021-22881. Versions Affected: >= 6.0.0 Not affected: < 6.0.0 Fixed Versions: 6.1.2.1, 6.0.3.5 Impact ------ Specially crafted "Host" headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. For example, configuration files that look like this: ``` config.hosts << '.tkte.ch' ``` When an allowed host contains a leading dot, a specially crafted Host header can be used to redirect to a malicious website. Workarounds ----------- In the case a patch can't be applied, the following monkey patch can be used in an initializer: ```ruby module ActionDispatch class HostAuthorization private def authorized?(request) valid_host = / \A (?<host>[a-z0-9.-]+|\[[a-f0-9]*:[a-f0-9\.:]+\]) (:\d+)? \z /x origin_host = valid_host.match( request.get_header("HTTP_HOST").to_s.downcase) forwarded_host = valid_host.match( request.x_forwarded_host.to_s.split(/,\s?/).last) origin_host && @permissions.allows?(origin_host[:host]) && ( forwarded_host.nil? || @permissions.allows?(forwarded_host[:host])) end end end ```

Aliases

CVE-2021-22881

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{
  "GSD": {
    "alias": "CVE-2021-22881",
    "description": "The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.",
    "id": "GSD-2021-22881",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-22881.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "actionpack",
            "purl": "pkg:gem/actionpack"
          }
        }
      ],
      "aliases": [
        "CVE-2021-22881",
        "GHSA-8877-prq4-9xfw"
      ],
      "details": "There is a possible open redirect vulnerability in the Host Authorization\nmiddleware in Action Pack. This vulnerability has been assigned the CVE\nidentifier CVE-2021-22881.\n\nVersions Affected:  \u003e= 6.0.0\nNot affected:       \u003c 6.0.0\nFixed Versions:     6.1.2.1, 6.0.3.5\n\nImpact\n------\nSpecially crafted \"Host\" headers in combination with certain \"allowed host\"\nformats can cause the Host Authorization middleware in Action Pack to redirect\nusers to a malicious website.\n\nImpacted applications will have allowed hosts with a leading dot.  For\nexample, configuration files that look like this:\n\n```\nconfig.hosts \u003c\u003c  \u0027.tkte.ch\u0027\n```\n\nWhen an allowed host contains a leading dot, a specially crafted Host header\ncan be used to redirect to a malicious website.\n\nWorkarounds\n-----------\nIn the case a patch can\u0027t be applied, the following monkey patch can be used\nin an initializer:\n\n```ruby\nmodule ActionDispatch\n  class HostAuthorization\n    private\n      def authorized?(request)\n        valid_host = /\n          \\A\n          (?\u003chost\u003e[a-z0-9.-]+|\\[[a-f0-9]*:[a-f0-9\\.:]+\\])\n          (:\\d+)?\n          \\z\n        /x\n\n        origin_host = valid_host.match(\n          request.get_header(\"HTTP_HOST\").to_s.downcase)\n        forwarded_host = valid_host.match(\n          request.x_forwarded_host.to_s.split(/,\\s?/).last)\n\n        origin_host \u0026\u0026 @permissions.allows?(origin_host[:host]) \u0026\u0026 (\n          forwarded_host.nil? || @permissions.allows?(forwarded_host[:host]))\n      end\n  end\nend\n```\n",
      "id": "GSD-2021-22881",
      "modified": "2021-02-10T00:00:00.000Z",
      "published": "2021-02-10T00:00:00.000Z",
      "references": [
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          "type": "WEB",
          "url": "https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E"
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      "schema_version": "1.4.0",
      "severity": [
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          "type": "CVSS_V3"
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      "summary": "Possible Open Redirect in Host Authorization Middleware"
    }
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      "description": "There is a possible open redirect vulnerability in the Host Authorization\nmiddleware in Action Pack. This vulnerability has been assigned the CVE\nidentifier CVE-2021-22881.\n\nVersions Affected:  \u003e= 6.0.0\nNot affected:       \u003c 6.0.0\nFixed Versions:     6.1.2.1, 6.0.3.5\n\nImpact\n------\nSpecially crafted \"Host\" headers in combination with certain \"allowed host\"\nformats can cause the Host Authorization middleware in Action Pack to redirect\nusers to a malicious website.\n\nImpacted applications will have allowed hosts with a leading dot.  For\nexample, configuration files that look like this:\n\n```\nconfig.hosts \u003c\u003c  \u0027.tkte.ch\u0027\n```\n\nWhen an allowed host contains a leading dot, a specially crafted Host header\ncan be used to redirect to a malicious website.\n\nWorkarounds\n-----------\nIn the case a patch can\u0027t be applied, the following monkey patch can be used\nin an initializer:\n\n```ruby\nmodule ActionDispatch\n  class HostAuthorization\n    private\n      def authorized?(request)\n        valid_host = /\n          \\A\n          (?\u003chost\u003e[a-z0-9.-]+|\\[[a-f0-9]*:[a-f0-9\\.:]+\\])\n          (:\\d+)?\n          \\z\n        /x\n\n        origin_host = valid_host.match(\n          request.get_header(\"HTTP_HOST\").to_s.downcase)\n        forwarded_host = valid_host.match(\n          request.x_forwarded_host.to_s.split(/,\\s?/).last)\n\n        origin_host \u0026\u0026 @permissions.allows?(origin_host[:host]) \u0026\u0026 (\n          forwarded_host.nil? || @permissions.allows?(forwarded_host[:host]))\n      end\n  end\nend\n```\n",
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      "patched_versions": [
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      "title": "Possible Open Redirect in Host Authorization Middleware",
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          "package_slug": "gem/actionpack",
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          "title": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
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            "availabilityImpact": "NONE",
            "baseScore": 5.8,
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            "confidentialityImpact": "LOW",
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      "lastModifiedDate": "2022-01-04T16:38Z",
      "publishedDate": "2021-02-11T18:15Z"
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  }
}

CVE-2021-22881 (GCVE-0-2021-22881)

Vulnerability from cvelistv5 – Published: 2021-02-11 16:12 – Updated: 2024-08-03 18:58

Summary

The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.

Severity

No CVSS data available.

CWE

CWE-601 - Open Redirect (CWE-601)

Assigner

hackerone mitre root

References

7 references

URL	Tags
https://hackerone.com/reports/1047447	x_refsource_MISC
https://discuss.rubyonrails.org/t/cve-2021-22881-…	x_refsource_MISC
https://benjamin-bouchet.com/cve-2021-22881-faill…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2021/05/05/2	mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/08/20/1	mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/12/14/5	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	https://github.com/rails/rails	Affected: Fixed in 6.1.2.1, 6.0.3.5

Show details on NVD website

JSON

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GHSA-8877-PRQ4-9XFW

Vulnerability from github – Published: 2021-03-02 03:44 – Updated: 2023-07-03 22:06

Summary

Actionpack Open Redirect Vulnerability

Details

The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted Host headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website.

Severity

6.1 (Medium)


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

Show details on source website

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.3.4"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.3.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.1.2.0"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "fixed": "6.1.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-22881"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-03-02T03:44:04Z",
    "nvd_published_at": "2021-02-11T18:15:00Z",
    "severity": "MODERATE"
  },
  "details": "The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. ",
  "id": "GHSA-8877-prq4-9xfw",
  "modified": "2023-07-03T22:06:02Z",
  "published": "2021-03-02T03:44:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22881"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/commit/b5de7b3a4787d8a55aaad39f477c16e3af65e444"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/1047447"
    },
    {
      "type": "WEB",
      "url": "https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization"
    },
    {
      "type": "WEB",
      "url": "https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/blob/v6.1.2.1/actionpack/CHANGELOG.md"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-22881.yml"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E"
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    },
    {
      "type": "WEB",
      "url": "https://rubygems.org/gems/actionpack"
    },
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      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2021/05/05/2"
    },
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      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2021/08/20/1"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2021/12/14/5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Actionpack Open Redirect Vulnerability "
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

GSD-2021-22881

CVE-2021-22881 (GCVE-0-2021-22881)

GHSA-8877-PRQ4-9XFW

Tags

Sightings

Nomenclature

Related by attack behaviour