CVE-2019-5419: Actionview Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m63j-wh5w-c252",
  "modified" : "2023-08-08T16:46:59Z",
  "published" : "2019-03-13T17:25:55Z",
  "aliases" : [ "CVE-2019-5419" ],
  "summary" : "Denial of Service Vulnerability in Action View",
  "details" : "# Denial of Service Vulnerability in Action View\n\nImpact \n------ \nSpecially crafted accept headers can cause the Action View template location code to consume 100% CPU, causing the server unable to process requests.  This impacts all Rails applications that render views. \n\nAll users running an affected release should either upgrade or use one of the workarounds immediately. \n\nReleases \n-------- \nThe 6.0.0.beta3, 5.2.2.1, 5.1.6.2, 5.0.7.2, and 4.2.11.1 releases are available at the normal locations. \n\nWorkarounds \n----------- \nThis vulnerability can be mitigated by wrapping `render` calls with `respond_to` blocks.  For example, the following example is vulnerable: \n\n``` ruby\nclass UserController < ApplicationController \n  def index \n    render \"index\" \n  end \nend \n``` \n\nBut the following code is not vulnerable: \n\n```ruby \nclass UserController < ApplicationController \n  def index \n    respond_to |format| \n      format.html { render \"index\" } \n    end \n  end \nend \n``` \n\nImplicit rendering is impacted, so this code is vulnerable: \n\n```ruby \nclass UserController < ApplicationController \n  def index \n  end \nend \n``` \n\nBut can be changed this this: \n\n```ruby \nclass UserController < ApplicationController \n  def index \n    respond_to |format| \n      format.html { render \"index\" } \n    end \n  end \nend \n``` \n\nAlternatively to specifying the format, the following monkey patch can be applied in an initializer: \n\n``` \n$ cat config/initializers/formats_filter.rb \n# frozen_string_literal: true \n\nActionDispatch::Request.prepend(Module.new do \n  def formats \n    super().select do |format| \n      format.symbol || format.ref == \"*/*\" \n    end \n  end \nend) \n``` \n\nPlease note that only the 5.2.x, 5.1.x, 5.0.x, and 4.2.x series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases. \n\nAlso note that the patches for this vulnerability are the same as CVE-2019-5418. \n\nCredits \n------- \nThanks to John Hawthorn <john@hawthorn.email> of GitHub ",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "actionview"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.2.11.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.2.11.0"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "actionview"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.2.0"
      }, {
        "fixed" : "5.2.2.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.2.2.0"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "actionview"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.1.0"
      }, {
        "fixed" : "5.1.6.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.1.6.1"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "actionview"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.0.7.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.0.7.1"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "actionview"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0.beta1"
      }, {
        "fixed" : "6.0.0.beta3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-5419"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rails/rails/pull/35708"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rails/rails/commit/f4c70c2222180b8d9d924f00af0c7fd632e26715"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0796"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1147"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1149"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1289"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rails/rails"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionview/CVE-2019-5419.yml"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/forum/#!topic/rubyonrails-security/GN7w9fFAQeI"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2019/03/msg00042.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA"
  }, {
    "type" : "WEB",
    "url" : "https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00011.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00025.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00001.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2019/03/22/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:45:03Z",
    "nvd_published_at" : "2019-03-27T14:29:01Z"
  }
}