gsd-2021-22881
Vulnerability from gsd
Modified
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
Aliases
CVE-2021-22881


To clipboard 

{
  "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": [
        {
          "type": "WEB",
          "url": "https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 6.1,
          "type": "CVSS_V3"
        }
      ],
      "summary": "Possible Open Redirect in Host Authorization Middleware"
    }
  },
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                    "version": {
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            "value": "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."
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          },
          {
            "name": "[oss-security] 20210505 [CVE-2021-22903] Possible Open Redirect Vulnerability in Action Pack",
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            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/08/20/1"
          },
          {
            "name": "[oss-security] 20211214 [CVE-2021-44528] Possible Open Redirect in Host Authorization Middleware",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/12/14/5"
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      "cve": "2021-22881",
      "cvss_v3": 6.1,
      "date": "2021-02-10",
      "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",
      "framework": "rails",
      "gem": "actionpack",
      "ghsa": "8877-prq4-9xfw",
      "patched_versions": [
        "~\u003e 6.0.3, \u003e= 6.0.3.5",
        "\u003e= 6.1.2.1"
      ],
      "title": "Possible Open Redirect in Host Authorization Middleware",
      "unaffected_versions": [
        "\u003c 6.0.0"
      ],
      "url": "https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E"
    },
    "gitlab.com": {
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          "affected_range": "\u003e=6.0.0 \u003c6.0.3.5||\u003e=6.1.0 \u003c6.1.2.1||=33",
          "affected_versions": "All versions starting from 6.0.0 before 6.0.3.5, all versions starting from 6.1.0 before 6.1.2.1, version 33",
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          "cwe_ids": [
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            "CWE-601",
            "CWE-937"
          ],
          "date": "2021-09-21",
          "description": "The Host Authorization middleware in Action Pack 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.",
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          "package_slug": "gem/actionpack",
          "pubdate": "2021-02-11",
          "solution": "Upgrade to versions 6.0.3.5, 6.1.2.1 or above.",
          "title": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
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            "https://nvd.nist.gov/vuln/detail/CVE-2021-22881"
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          "description": "The Host Authorization middleware in Action Pack 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.",
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          "package_slug": "gem/rails",
          "pubdate": "2021-02-11",
          "solution": "Upgrade to versions 6.0.3.5, 6.1.2.1 or above.",
          "title": "URL Redirection to Untrusted Site (Open Redirect)",
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      "impact": {
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          "cvssV2": {
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            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
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            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
            "version": "2.0"
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          "exploitabilityScore": 8.6,
          "impactScore": 4.9,
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          "obtainOtherPrivilege": false,
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 2.7
        }
      },
      "lastModifiedDate": "2022-01-04T16:38Z",
      "publishedDate": "2021-02-11T18:15Z"
    }
  }
}


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