gsd-2020-8184
Vulnerability from gsd
Modified
2020-06-15 00:00
Details
It is possible to forge a secure or host-only cookie prefix in Rack using an arbitrary cookie write by using URL encoding (percent-encoding) on the name of the cookie. This could result in an application that is dependent on this prefix to determine if a cookie is safe to process being manipulated into processing an insecure or cross-origin request. This vulnerability has been assigned the CVE identifier CVE-2020-8184. Versions Affected: rack < 2.2.3, rack < 2.1.4 Not affected: Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process Fixed Versions: rack >= 2.2.3, rack >= 2.1.4 Impact ------ An attacker may be able to trick a vulnerable application into processing an insecure (non-SSL) or cross-origin request if they can gain the ability to write arbitrary cookies that are sent to the application. Workarounds ----------- If your application is impacted but you cannot upgrade to the released versions or apply the provided patch, this issue can be temporarily addressed by adding the following workaround: ``` module Rack module Utils module_function def parse_cookies_header(header) return {} unless header header.split(/[;] */n).each_with_object({}) do |cookie, cookies| next if cookie.empty? key, value = cookie.split('=', 2) cookies[key] = (unescape(value) rescue value) unless cookies.key?(key) end end end end ```
Aliases
Aliases
CVE-2020-8184


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-8184",
    "description": "A reliance on cookies without validation/integrity check security vulnerability exists in rack \u003c 2.2.3, rack \u003c 2.1.4 that makes it is possible for an attacker to forge a secure or host-only cookie prefix.",
    "id": "GSD-2020-8184",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-8184.html",
      "https://access.redhat.com/errata/RHSA-2020:4366",
      "https://ubuntu.com/security/CVE-2020-8184",
      "https://advisories.mageia.org/CVE-2020-8184.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "rack",
            "purl": "pkg:gem/rack"
          }
        }
      ],
      "aliases": [
        "CVE-2020-8184",
        "GHSA-j6w9-fv6q-3q52"
      ],
      "details": "It is possible to forge a secure or host-only cookie prefix in Rack using\nan arbitrary cookie write by using URL encoding (percent-encoding) on the\nname of the cookie. This could result in an application that is dependent on\nthis prefix to determine if a cookie is safe to process being manipulated\ninto processing an insecure or cross-origin request.\nThis vulnerability has been assigned the CVE identifier CVE-2020-8184.\n\nVersions Affected:  rack \u003c 2.2.3, rack \u003c 2.1.4\nNot affected:       Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process\nFixed Versions:     rack \u003e= 2.2.3, rack \u003e= 2.1.4\n\nImpact\n------\n\nAn attacker may be able to trick a vulnerable application into processing an\ninsecure (non-SSL) or cross-origin request if they can gain the ability to write\narbitrary cookies that are sent to the application.\n\nWorkarounds\n-----------\n\nIf your application is impacted but you cannot upgrade to the released versions or apply\nthe provided patch, this issue can be temporarily addressed by adding the following workaround:\n\n```\nmodule Rack\n  module Utils\n    module_function def parse_cookies_header(header)\n      return {} unless header\n      header.split(/[;] */n).each_with_object({}) do |cookie, cookies|\n        next if cookie.empty?\n        key, value = cookie.split(\u0027=\u0027, 2)\n        cookies[key] = (unescape(value) rescue value) unless cookies.key?(key)\n      end\n    end\n  end\nend\n```\n",
      "id": "GSD-2020-8184",
      "modified": "2020-06-15T00:00:00.000Z",
      "published": "2020-06-15T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://groups.google.com/g/rubyonrails-security/c/OWtmozPH9Ak"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 7.5,
          "type": "CVSS_V3"
        }
      ],
      "summary": "Percent-encoded cookies can be used to overwrite existing prefixed cookie names"
    }
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      "cve": "2020-8184",
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      "date": "2020-06-15",
      "description": "It is possible to forge a secure or host-only cookie prefix in Rack using\nan arbitrary cookie write by using URL encoding (percent-encoding) on the\nname of the cookie. This could result in an application that is dependent on\nthis prefix to determine if a cookie is safe to process being manipulated\ninto processing an insecure or cross-origin request.\nThis vulnerability has been assigned the CVE identifier CVE-2020-8184.\n\nVersions Affected:  rack \u003c 2.2.3, rack \u003c 2.1.4\nNot affected:       Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process\nFixed Versions:     rack \u003e= 2.2.3, rack \u003e= 2.1.4\n\nImpact\n------\n\nAn attacker may be able to trick a vulnerable application into processing an\ninsecure (non-SSL) or cross-origin request if they can gain the ability to write\narbitrary cookies that are sent to the application.\n\nWorkarounds\n-----------\n\nIf your application is impacted but you cannot upgrade to the released versions or apply\nthe provided patch, this issue can be temporarily addressed by adding the following workaround:\n\n```\nmodule Rack\n  module Utils\n    module_function def parse_cookies_header(header)\n      return {} unless header\n      header.split(/[;] */n).each_with_object({}) do |cookie, cookies|\n        next if cookie.empty?\n        key, value = cookie.split(\u0027=\u0027, 2)\n        cookies[key] = (unescape(value) rescue value) unless cookies.key?(key)\n      end\n    end\n  end\nend\n```\n",
      "gem": "rack",
      "ghsa": "j6w9-fv6q-3q52",
      "patched_versions": [
        "~\u003e 2.1.4",
        "\u003e= 2.2.3"
      ],
      "title": "Percent-encoded cookies can be used to overwrite existing prefixed cookie names",
      "url": "https://groups.google.com/g/rubyonrails-security/c/OWtmozPH9Ak"
    },
    "gitlab.com": {
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          "affected_range": "\u003c2.1.4||\u003e=2.2.0 \u003c2.2.3",
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          "cwe_ids": [
            "CWE-1035",
            "CWE-20",
            "CWE-937"
          ],
          "date": "2020-10-05",
          "description": "A reliance on cookies without `validation/integrity` check security vulnerability exists in rack that makes it is possible for an attacker to forge a secure or host-only cookie prefix.",
          "fixed_versions": [
            "2.1.4",
            "2.2.3"
          ],
          "identifier": "CVE-2020-8184",
          "identifiers": [
            "CVE-2020-8184"
          ],
          "not_impacted": "All versions starting from 2.1.4 before 2.2.0, all versions starting from 2.2.3",
          "package_slug": "gem/rack",
          "pubdate": "2020-06-19",
          "solution": "Upgrade to versions 2.1.4, 2.2.3 or above.",
          "title": "Improper Input Validation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8184"
          ],
          "uuid": "b960a2e0-c5c1-4117-b443-bf772494bcb7"
        }
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          "cvssV2": {
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            "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,
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          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-02-16T19:24Z",
      "publishedDate": "2020-06-19T17:15Z"
    }
  }
}


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