GSD-2015-3226

Vulnerability from gsd - Updated: 2015-06-16 00:00
Details
When a `Hash` containing user-controlled data is encode as JSON (either through `Hash#to_json` or `ActiveSupport::JSON.encode`), Rails does not perform adequate escaping that matches the guarantee implied by the `escape_html_entities_in_json` option (which is enabled by default). If this resulting JSON string is subsequently inserted directly into an HTML page, the page will be vulnerable to XSS attacks. For example, the following code snippet is vulnerable to this attack: <%= javascript_tag "var data = #{user_supplied_data.to_json};" %> Similarly, the following is also vulnerable: <script> var data = <%= ActiveSupport::JSON.encode(user_supplied_data).html_safe %>; </script> All applications that renders JSON-encoded strings that contains user-controlled data in their views should either upgrade to one of the FIXED versions or use the suggested workaround immediately. Workarounds ----------- To work around this problem add an initializer with the following code: module ActiveSupport module JSON module Encoding private class EscapedString def to_s self end end end end end
Aliases

{
  "GSD": {
    "alias": "CVE-2015-3226",
    "description": "Cross-site scripting (XSS) vulnerability in json/encoding.rb in Active Support in Ruby on Rails 3.x and 4.1.x before 4.1.11 and 4.2.x before 4.2.2 allows remote attackers to inject arbitrary web script or HTML via a crafted Hash that is mishandled during JSON encoding.",
    "id": "GSD-2015-3226",
    "references": [
      "https://www.suse.com/security/cve/CVE-2015-3226.html",
      "https://www.debian.org/security/2016/dsa-3464"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "activesupport",
            "purl": "pkg:gem/activesupport"
          }
        }
      ],
      "aliases": [
        "CVE-2015-3226",
        "GHSA-vxvp-4xwc-jpp6"
      ],
      "details": "When a `Hash` containing user-controlled data is encode as JSON (either through\n`Hash#to_json` or `ActiveSupport::JSON.encode`), Rails does not perform adequate\nescaping that matches the guarantee implied by the `escape_html_entities_in_json`\noption (which is enabled by default). If this resulting JSON string is subsequently\ninserted directly into an HTML page, the page will be vulnerable to XSS attacks.\n\nFor example, the following code snippet is vulnerable to this attack:\n\n    \u003c%= javascript_tag \"var data = #{user_supplied_data.to_json};\" %\u003e\n\nSimilarly, the following is also vulnerable:\n\n    \u003cscript\u003e\n      var data = \u003c%= ActiveSupport::JSON.encode(user_supplied_data).html_safe %\u003e;\n    \u003c/script\u003e\n\nAll applications that renders JSON-encoded strings that contains user-controlled\ndata in their views should either upgrade to one of the FIXED versions or use\nthe suggested workaround immediately.\n\nWorkarounds\n-----------\nTo work around this problem add an initializer with the following code:\n\n  module ActiveSupport\n    module JSON\n      module Encoding\n        private\n        class EscapedString\n          def to_s\n            self\n          end\n        end\n      end\n    end\n  end\n",
      "id": "GSD-2015-3226",
      "modified": "2015-06-16T00:00:00.000Z",
      "published": "2015-06-16T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://groups.google.com/forum/#!topic/ruby-security-ann/7VlB_pck3hU"
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      "schema_version": "1.4.0",
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    }
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            "url": "https://groups.google.com/forum/message/raw?msg=rubyonrails-security/7VlB_pck3hU/3QZrGIaQW6cJ"
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      "cve": "2015-3226",
      "date": "2015-06-16",
      "description": "When a `Hash` containing user-controlled data is encode as JSON (either through\n`Hash#to_json` or `ActiveSupport::JSON.encode`), Rails does not perform adequate\nescaping that matches the guarantee implied by the `escape_html_entities_in_json`\noption (which is enabled by default). If this resulting JSON string is subsequently\ninserted directly into an HTML page, the page will be vulnerable to XSS attacks.\n\nFor example, the following code snippet is vulnerable to this attack:\n\n    \u003c%= javascript_tag \"var data = #{user_supplied_data.to_json};\" %\u003e\n\nSimilarly, the following is also vulnerable:\n\n    \u003cscript\u003e\n      var data = \u003c%= ActiveSupport::JSON.encode(user_supplied_data).html_safe %\u003e;\n    \u003c/script\u003e\n\nAll applications that renders JSON-encoded strings that contains user-controlled\ndata in their views should either upgrade to one of the FIXED versions or use\nthe suggested workaround immediately.\n\nWorkarounds\n-----------\nTo work around this problem add an initializer with the following code:\n\n  module ActiveSupport\n    module JSON\n      module Encoding\n        private\n        class EscapedString\n          def to_s\n            self\n          end\n        end\n      end\n    end\n  end\n",
      "framework": "rails",
      "gem": "activesupport",
      "ghsa": "vxvp-4xwc-jpp6",
      "patched_versions": [
        "\u003e= 4.2.2",
        "~\u003e 4.1.11"
      ],
      "title": "XSS Vulnerability in ActiveSupport::JSON.encode",
      "unaffected_versions": [
        "\u003c 4.1.0"
      ],
      "url": "https://groups.google.com/forum/#!topic/ruby-security-ann/7VlB_pck3hU"
    },
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      "advisories": [
        {
          "affected_range": "\u003e=4.1.0a \u003c4.1.11||\u003e=4.2.0a \u003c4.2.2",
          "affected_versions": "All versions starting from 4.1.0a before 4.1.11, all versions starting from 4.2.0a before 4.2.2",
          "credit": "Francois Chagnon of Shopify",
          "cvss_v2": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-79",
            "CWE-937"
          ],
          "date": "2019-08-08",
          "description": "When a `Hash` containing user-controlled data is encoded as JSON (either through `Hash#to_json` or `ActiveSupport::JSON.encode`), Rails does not perform adequate escaping that matches the guarantee implied by the `escape_html_entities_in_json` option (which is enabled by default). If this resulting JSON string is subsequently inserted directly into an HTML page, the page will be vulnerable to XSS attacks.",
          "fixed_versions": [
            "4.1.11",
            "4.2.2"
          ],
          "identifier": "CVE-2015-3226",
          "identifiers": [
            "CVE-2015-3226"
          ],
          "not_impacted": "3.x and 4.0.x",
          "package_slug": "gem/activesupport",
          "pubdate": "2015-07-26",
          "solution": "Upgrade to latest, apply patch or use workaround; see provided link.",
          "title": "XSS Vulnerability in ActiveSupport::JSON.encode",
          "urls": [
            "https://groups.google.com/forum/#!searchin/rubyonrails-core/CVE-2015-3226/rubyonrails-core/qBUqVlXERag/kuH3wQk1kxUJ",
            "https://groups.google.com/forum/#!topic/ruby-security-ann/7VlB_pck3hU"
          ],
          "uuid": "4888d3dc-f4ac-4765-a7fb-f922bfbdae02"
        }
      ]
    },
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      "impact": {
        "baseMetricV2": {
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": true
        }
      },
      "lastModifiedDate": "2019-08-08T15:43Z",
      "publishedDate": "2015-07-26T22:59Z"
    }
  }
}


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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.
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  • 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.


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