gsd-2015-7579
Vulnerability from gsd
Modified
2016-01-25 00:00
Details
There is a XSS vulnerability in `Rails::Html::FullSanitizer` used by Action View's `strip_tags`. This vulnerability has been assigned the CVE identifier CVE-2015-7579. Versions Affected: 1.0.2 Not affected: 1.0.0, 1.0.1 Fixed Versions: 1.0.3 Impact ------ Due to the way that `Rails::Html::FullSanitizer` is implemented, if an attacker passes an already escaped HTML entity to the input of Action View's `strip_tags` these entities will be unescaped what may cause a XSS attack if used in combination with `raw` or `html_safe`. For example: strip_tags("&lt;script&gt;alert('XSS')&lt;/script&gt;") Would generate: <script>alert('XSS')</script> After the fix it will generate: &lt;script&gt;alert('XSS')&lt;/script&gt; All users running an affected release should either upgrade or use one of the workarounds immediately. Releases -------- The FIXED releases are available at the normal locations. Workarounds ----------- If you can't upgrade, please use the following monkey patch in an initializer that is loaded before your application: ``` $ cat config/initializers/strip_tags_fix.rb class ActionView::Base def strip_tags(html) self.class.full_sanitizer.sanitize(html) end end ``` Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. * Do-not-unescape-already-escaped-HTML-entities.patch Credits ------- Thank you to Arthur Neves from GitHub and Spyros Livathinos from Zendesk for reporting the problem and working with us to fix it.
Aliases
Aliases
CVE-2015-7579


To clipboard 

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    "alias": "CVE-2015-7579",
    "description": "Cross-site scripting (XSS) vulnerability in the rails-html-sanitizer gem 1.0.2 for Ruby on Rails 4.2.x and 5.x allows remote attackers to inject arbitrary web script or HTML via an HTML entity that is mishandled by the Rails::Html::FullSanitizer class.",
    "id": "GSD-2015-7579",
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    ]
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  "gsd": {
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      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
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      "details": "There is a XSS vulnerability in `Rails::Html::FullSanitizer` used by Action View\u0027s `strip_tags`.\nThis vulnerability has been assigned the CVE identifier CVE-2015-7579.\n\nVersions Affected:  1.0.2\nNot affected:       1.0.0, 1.0.1\nFixed Versions:     1.0.3\n\nImpact\n------\nDue to the way that `Rails::Html::FullSanitizer` is implemented, if an attacker\npasses an already escaped HTML entity to the input of Action View\u0027s `strip_tags`\nthese entities will be unescaped what may cause a XSS attack if used in combination\nwith `raw` or `html_safe`.\n\nFor example:\n\n    strip_tags(\"\u0026lt;script\u0026gt;alert(\u0027XSS\u0027)\u0026lt;/script\u0026gt;\")\n\nWould generate:\n\n    \u003cscript\u003ealert(\u0027XSS\u0027)\u003c/script\u003e\n\nAfter the fix it will generate:\n\n    \u0026lt;script\u0026gt;alert(\u0027XSS\u0027)\u0026lt;/script\u0026gt;\n\nAll users running an affected release should either upgrade or use one of the\nworkarounds immediately.\n\nReleases\n--------\nThe FIXED releases are available at the normal locations.\n\nWorkarounds\n-----------\nIf you can\u0027t upgrade, please use the following monkey patch in an initializer\nthat is loaded before your application:\n\n```\n$ cat config/initializers/strip_tags_fix.rb\nclass ActionView::Base\n  def strip_tags(html)\n    self.class.full_sanitizer.sanitize(html)\n  end\nend\n```\n\nPatches\n-------\nTo aid users who aren\u0027t able to upgrade immediately we have provided patches\nfor the two supported release series. They are in git-am format and consist\nof a single changeset.\n\n* Do-not-unescape-already-escaped-HTML-entities.patch\n\nCredits\n-------\nThank you to Arthur Neves from GitHub and Spyros Livathinos from Zendesk for\nreporting the problem and working with us to fix it.\n",
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      "cve": "2015-7579",
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      "date": "2016-01-25",
      "description": "There is a XSS vulnerability in `Rails::Html::FullSanitizer` used by Action View\u0027s `strip_tags`.\nThis vulnerability has been assigned the CVE identifier CVE-2015-7579.\n\nVersions Affected:  1.0.2\nNot affected:       1.0.0, 1.0.1\nFixed Versions:     1.0.3\n\nImpact\n------\nDue to the way that `Rails::Html::FullSanitizer` is implemented, if an attacker\npasses an already escaped HTML entity to the input of Action View\u0027s `strip_tags`\nthese entities will be unescaped what may cause a XSS attack if used in combination\nwith `raw` or `html_safe`.\n\nFor example:\n\n    strip_tags(\"\u0026lt;script\u0026gt;alert(\u0027XSS\u0027)\u0026lt;/script\u0026gt;\")\n\nWould generate:\n\n    \u003cscript\u003ealert(\u0027XSS\u0027)\u003c/script\u003e\n\nAfter the fix it will generate:\n\n    \u0026lt;script\u0026gt;alert(\u0027XSS\u0027)\u0026lt;/script\u0026gt;\n\nAll users running an affected release should either upgrade or use one of the\nworkarounds immediately.\n\nReleases\n--------\nThe FIXED releases are available at the normal locations.\n\nWorkarounds\n-----------\nIf you can\u0027t upgrade, please use the following monkey patch in an initializer\nthat is loaded before your application:\n\n```\n$ cat config/initializers/strip_tags_fix.rb\nclass ActionView::Base\n  def strip_tags(html)\n    self.class.full_sanitizer.sanitize(html)\n  end\nend\n```\n\nPatches\n-------\nTo aid users who aren\u0027t able to upgrade immediately we have provided patches\nfor the two supported release series. They are in git-am format and consist\nof a single changeset.\n\n* Do-not-unescape-already-escaped-HTML-entities.patch\n\nCredits\n-------\nThank you to Arthur Neves from GitHub and Spyros Livathinos from Zendesk for\nreporting the problem and working with us to fix it.\n",
      "gem": "rails-html-sanitizer",
      "ghsa": "r9c2-cr39-c8g6",
      "patched_versions": [
        "\u003e= 1.0.3"
      ],
      "title": "XSS vulnerability in rails-html-sanitizer",
      "unaffected_versions": [
        "~\u003e 1.0.0",
        "~\u003e 1.0.1"
      ],
      "url": "https://groups.google.com/forum/#!topic/rubyonrails-security/OU9ugTZcbjc"
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        {
          "affected_range": "1.0.2",
          "affected_versions": "Version 1.0.2",
          "credit": "Arthur Neves from GitHub and Spyros Livathinos from Zendesk",
          "cvss_v2": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "cvss_v3": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-79",
            "CWE-937"
          ],
          "date": "2019-08-08",
          "description": "Due to the way that `Rails::Html::FullSanitizer` is implemented, if an attacker passes an already escaped HTML entity to the input of Action View\u0027s `strip_tags` these entities will be unescaped what may cause a XSS attack if used in combination with `raw` or `html_safe`. ",
          "fixed_versions": [
            "1.0.3"
          ],
          "identifier": "CVE-2015-7579",
          "identifiers": [
            "CVE-2015-7579"
          ],
          "not_impacted": "1.0.0, 1.0.1",
          "package_slug": "gem/rails-html-sanitizer",
          "pubdate": "2016-02-15",
          "solution": "Upgrade to latest, apply patch or use workaround. See provided link.",
          "title": "XSS vulnerability in strip_tags",
          "urls": [
            "https://groups.google.com/forum/#!topic/rubyonrails-security/OU9ugTZcbjc"
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            "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"
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          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
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        },
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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          "impactScore": 2.7
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      },
      "lastModifiedDate": "2019-08-08T15:16Z",
      "publishedDate": "2016-02-16T02:59Z"
    }
  }
}


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  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.