gsd-2020-5267
Vulnerability from gsd
Modified
2020-03-19 00:00
Details
There is a possible XSS vulnerability in ActionView's JavaScript literal escape helpers. Views that use the `j` or `escape_javascript` methods may be susceptible to XSS attacks. Versions Affected: All. Not affected: None. Fixed Versions: 6.0.2.2, 5.2.4.2 Impact ------ There is a possible XSS vulnerability in the `j` and `escape_javascript` methods in ActionView. These methods are used for escaping JavaScript string literals. Impacted code will look something like this: ```erb <script>let a = `<%= j unknown_input %>`</script> ``` or ```erb <script>let a = `<%= escape_javascript unknown_input %>`</script> ``` Releases -------- The 6.0.2.2 and 5.2.4.2 releases are available at the normal locations. Workarounds ----------- For those that can't upgrade, the following monkey patch may be used: ```ruby ActionView::Helpers::JavaScriptHelper::JS_ESCAPE_MAP.merge!( { "`" => "\\`", "$" => "\\$" } ) module ActionView::Helpers::JavaScriptHelper alias :old_ej :escape_javascript alias :old_j :j def escape_javascript(javascript) javascript = javascript.to_s if javascript.empty? result = "" else result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|\342\200\251|[\n\r"']|[`]|[$])/u, JS_ESCAPE_MAP) end javascript.html_safe? ? result.html_safe : result end alias :j :escape_javascript end ```
Aliases



{
  "GSD": {
    "alias": "CVE-2020-5267",
    "description": "In ActionView before versions 6.0.2.2 and 5.2.4.2, there is a possible XSS vulnerability in ActionView\u0027s JavaScript literal escape helpers. Views that use the `j` or `escape_javascript` methods may be susceptible to XSS attacks. The issue is fixed in versions 6.0.2.2 and 5.2.4.2.",
    "id": "GSD-2020-5267",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-5267.html",
      "https://access.redhat.com/errata/RHSA-2020:4366"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "actionview",
            "purl": "pkg:gem/actionview"
          }
        }
      ],
      "aliases": [
        "CVE-2020-5267",
        "GHSA-65cv-r6x7-79hv"
      ],
      "details": "There is a possible XSS vulnerability in ActionView\u0027s JavaScript literal\nescape helpers.  Views that use the `j` or `escape_javascript` methods\nmay be susceptible to XSS attacks.\n\nVersions Affected:  All.\nNot affected:       None.\nFixed Versions:     6.0.2.2, 5.2.4.2\n\nImpact\n------\nThere is a possible XSS vulnerability in the `j` and `escape_javascript`\nmethods in ActionView.  These methods are used for escaping JavaScript string\nliterals.  Impacted code will look something like this:\n\n```erb\n\u003cscript\u003elet a = `\u003c%= j unknown_input %\u003e`\u003c/script\u003e\n```\n\nor\n\n```erb\n\u003cscript\u003elet a = `\u003c%= escape_javascript unknown_input %\u003e`\u003c/script\u003e\n```\n\nReleases\n--------\nThe 6.0.2.2 and 5.2.4.2 releases are available at the normal locations.\n\nWorkarounds\n-----------\nFor those that can\u0027t upgrade, the following monkey patch may be used:\n\n```ruby\nActionView::Helpers::JavaScriptHelper::JS_ESCAPE_MAP.merge!(\n  {\n    \"`\" =\u003e \"\\\\`\",\n    \"$\" =\u003e \"\\\\$\"\n  }\n)\n\nmodule ActionView::Helpers::JavaScriptHelper\n  alias :old_ej :escape_javascript\n  alias :old_j :j\n\n  def escape_javascript(javascript)\n    javascript = javascript.to_s\n    if javascript.empty?\n      result = \"\"\n    else\n      result = javascript.gsub(/(\\\\|\u003c\\/|\\r\\n|\\342\\200\\250|\\342\\200\\251|[\\n\\r\"\u0027]|[`]|[$])/u, JS_ESCAPE_MAP)\n    end\n    javascript.html_safe? ? result.html_safe : result\n  end\n\n  alias :j :escape_javascript\nend\n```\n",
      "id": "GSD-2020-5267",
      "modified": "2020-03-19T00:00:00.000Z",
      "published": "2020-03-19T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://groups.google.com/forum/#!topic/rubyonrails-security/55reWMM_Pg8"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
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          "score": 4.0,
          "type": "CVSS_V3"
        }
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      "summary": "Possible XSS vulnerability in ActionView"
    }
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          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4,
          "baseSeverity": "MEDIUM",
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      "cve": "2020-5267",
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      "date": "2020-03-19",
      "description": "There is a possible XSS vulnerability in ActionView\u0027s JavaScript literal\nescape helpers.  Views that use the `j` or `escape_javascript` methods\nmay be susceptible to XSS attacks.\n\nVersions Affected:  All.\nNot affected:       None.\nFixed Versions:     6.0.2.2, 5.2.4.2\n\nImpact\n------\nThere is a possible XSS vulnerability in the `j` and `escape_javascript`\nmethods in ActionView.  These methods are used for escaping JavaScript string\nliterals.  Impacted code will look something like this:\n\n```erb\n\u003cscript\u003elet a = `\u003c%= j unknown_input %\u003e`\u003c/script\u003e\n```\n\nor\n\n```erb\n\u003cscript\u003elet a = `\u003c%= escape_javascript unknown_input %\u003e`\u003c/script\u003e\n```\n\nReleases\n--------\nThe 6.0.2.2 and 5.2.4.2 releases are available at the normal locations.\n\nWorkarounds\n-----------\nFor those that can\u0027t upgrade, the following monkey patch may be used:\n\n```ruby\nActionView::Helpers::JavaScriptHelper::JS_ESCAPE_MAP.merge!(\n  {\n    \"`\" =\u003e \"\\\\`\",\n    \"$\" =\u003e \"\\\\$\"\n  }\n)\n\nmodule ActionView::Helpers::JavaScriptHelper\n  alias :old_ej :escape_javascript\n  alias :old_j :j\n\n  def escape_javascript(javascript)\n    javascript = javascript.to_s\n    if javascript.empty?\n      result = \"\"\n    else\n      result = javascript.gsub(/(\\\\|\u003c\\/|\\r\\n|\\342\\200\\250|\\342\\200\\251|[\\n\\r\"\u0027]|[`]|[$])/u, JS_ESCAPE_MAP)\n    end\n    javascript.html_safe? ? result.html_safe : result\n  end\n\n  alias :j :escape_javascript\nend\n```\n",
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      "title": "Possible XSS vulnerability in ActionView",
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            "CWE-937"
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          "date": "2020-10-05",
          "description": "In ActionView there is a possible XSS vulnerability in ActionView\u0027s JavaScript literal escape helpers. Views that use the `j` or `escape_javascript` methods may be susceptible to XSS.",
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          "package_slug": "gem/actionview",
          "pubdate": "2020-03-19",
          "solution": "Upgrade to versions 5.2.4.2, 6.0.2.2 or above.",
          "title": "Cross-site Scripting",
          "urls": [
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      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "NONE",
            "baseScore": 3.5,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 6.8,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
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            "userInteraction": "REQUIRED",
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            "version": "3.1"
          },
          "exploitabilityScore": 1.7,
          "impactScore": 2.7
        }
      },
      "lastModifiedDate": "2023-02-03T16:39Z",
      "publishedDate": "2020-03-19T18:15Z"
    }
  }
}


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