gsd-2020-5217
Vulnerability from gsd
Modified
2020-01-23 00:00
Details
If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src. A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. > Duplicate script-src directives detected. All but the first instance will be ignored. See https://www.w3.org/TR/CSP3/#parse-serialized-policy > Note: In this case, the user agent SHOULD notify developers that a duplicate directive was > ignored. A console warning might be appropriate, for example. # Workarounds If you are passing user input into the above methods, you could filter out the input: ``` override_content_security_policy_directives(:frame_src, [user_input.gsub(";", " ")]) ```
Aliases
Aliases
CVE-2020-5217


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-5217",
    "description": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could be used to e.g. override a script-src directive. Duplicate directives are ignored and the first one wins. The directives in secure_headers are sorted alphabetically so they pretty much all come before script-src. A previously undefined directive would receive a value even if SecureHeaders::OPT_OUT was supplied. The fixed versions will silently convert the semicolons to spaces and emit a deprecation warning when this happens. This will result in innocuous browser console messages if being exploited/accidentally used. In future releases, we will raise application errors resulting in 500s. Depending on what major version you are using, the fixed versions are 6.2.0, 5.1.0, 3.8.0.",
    "id": "GSD-2020-5217",
    "references": [
      "https://access.redhat.com/errata/RHSA-2020:4366"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "secure_headers",
            "purl": "pkg:gem/secure_headers"
          }
        }
      ],
      "aliases": [
        "CVE-2020-5217",
        "GHSA-xq52-rv6w-397c"
      ],
      "details": "If user-supplied input was passed into append/override_content_security_policy_directives,\na semicolon could be injected leading to directive injection.\n\nThis could be used to e.g. override a script-src directive. Duplicate directives are ignored\nand the first one wins. The directives in secure_headers are sorted alphabetically so they\npretty much all come before script-src. A previously undefined directive would receive a value\neven if SecureHeaders::OPT_OUT was supplied.\n\nThe fixed versions will silently convert the semicolons to spaces and emit a deprecation warning\nwhen this happens. This will result in innocuous browser console messages if being\nexploited/accidentally used. In future releases, we will raise application errors resulting in\n500s.\n\n\u003e Duplicate script-src directives detected. All but the first instance will be ignored.\n\nSee https://www.w3.org/TR/CSP3/#parse-serialized-policy\n\n\u003e Note: In this case, the user agent SHOULD notify developers that a duplicate directive was\n\u003e ignored. A console warning might be appropriate, for example.\n\n# Workarounds\n\nIf you are passing user input into the above methods, you could filter out the input:\n\n```\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\";\", \" \")])\n```",
      "id": "GSD-2020-5217",
      "modified": "2020-01-23T00:00:00.000Z",
      "published": "2020-01-23T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 4.4,
          "type": "CVSS_V3"
        }
      ],
      "summary": "secure_headers directive injection using semicolon"
    }
  },
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          "vendor_data": [
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              "product": {
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                          "version_value": "\u003e= 5.0.0, \u003c 5.1.0"
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          "baseScore": 4.4,
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          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N",
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                "lang": "eng",
                "value": "CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code (\u0027Eval Injection\u0027)"
              }
            ]
          }
        ]
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            "refsource": "MISC",
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      },
      "source": {
        "advisory": "GHSA-xq52-rv6w-397c",
        "discovery": "UNKNOWN"
      }
    },
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      "cve": "2020-5217",
      "cvss_v3": 4.4,
      "date": "2020-01-23",
      "description": "If user-supplied input was passed into append/override_content_security_policy_directives,\na semicolon could be injected leading to directive injection.\n\nThis could be used to e.g. override a script-src directive. Duplicate directives are ignored\nand the first one wins. The directives in secure_headers are sorted alphabetically so they\npretty much all come before script-src. A previously undefined directive would receive a value\neven if SecureHeaders::OPT_OUT was supplied.\n\nThe fixed versions will silently convert the semicolons to spaces and emit a deprecation warning\nwhen this happens. This will result in innocuous browser console messages if being\nexploited/accidentally used. In future releases, we will raise application errors resulting in\n500s.\n\n\u003e Duplicate script-src directives detected. All but the first instance will be ignored.\n\nSee https://www.w3.org/TR/CSP3/#parse-serialized-policy\n\n\u003e Note: In this case, the user agent SHOULD notify developers that a duplicate directive was\n\u003e ignored. A console warning might be appropriate, for example.\n\n# Workarounds\n\nIf you are passing user input into the above methods, you could filter out the input:\n\n```\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\";\", \" \")])\n```",
      "gem": "secure_headers",
      "ghsa": "xq52-rv6w-397c",
      "patched_versions": [
        "~\u003e 3.8",
        "~\u003e 5.1",
        "\u003e= 6.2.0"
      ],
      "title": "secure_headers directive injection using semicolon",
      "url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c"
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c3.8.0||\u003e=5.0.0 \u003c5.1.0||\u003e=6.0.0 \u003c6.2.0",
          "affected_versions": "All versions before 3.8.0, all versions starting from 5.0.0 before 5.1.0, all versions starting from 6.0.0 before 6.2.0",
          "cvss_v2": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-74",
            "CWE-937"
          ],
          "date": "2020-05-21",
          "description": "The secure_headers gem is vulnerable to a directive injection vulnerability.",
          "fixed_versions": [
            "3.8.0",
            "5.1.0",
            "6.2.0"
          ],
          "identifier": "CVE-2020-5217",
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            "CVE-2020-5217",
            "GHSA-xq52-rv6w-397c"
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          "not_impacted": "All versions starting from 3.8.0 before 5.0.0, all versions starting from 5.1.0 before 6.0.0, all versions starting from 6.2.0",
          "package_slug": "gem/secure_headers",
          "pubdate": "2020-01-23",
          "solution": "Upgrade to versions 3.8.0, 5.1.0, 6.2.0 or above.",
          "title": "Injection Vulnerability",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-5217"
          ],
          "uuid": "3a9043b9-524b-47b3-b9a6-28c9d167d72c"
        }
      ]
    },
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
            "version": "2.0"
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          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
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          "impactScore": 1.4
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      },
      "lastModifiedDate": "2020-05-21T13:51Z",
      "publishedDate": "2020-01-23T03:15Z"
    }
  }
}


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