ghsa-8727-m6gj-mc37
Vulnerability from github
Published
2020-05-26 15:09
Modified
2023-09-25 16:55
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
Possible Strong Parameters Bypass in ActionPack
Details

There is a strong parameters bypass vector in ActionPack.

Versions Affected: rails <= 6.0.3 Not affected: rails < 5.0.0 Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1

Impact

In some cases user supplied information can be inadvertently leaked from Strong Parameters. Specifically the return value of each, or each_value, or each_pair will return the underlying "untrusted" hash of data that was read from the parameters. Applications that use this return value may be inadvertently use untrusted user input.

Impacted code will look something like this:

`` def update # Attacker has included the parameter:{ is_admin: true }` User.update(clean_up_params) end

def clean_up_params params.each { |k, v| SomeModel.check(v) if k == :name } end ```

Note the mistaken use of each in the clean_up_params method in the above example.

Workarounds

Do not use the return values of each, each_value, or each_pair in your application.

Show details on source website

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.2.4.2"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.2.4.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.3"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-8164"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-05-26T15:06:53Z",
    "nvd_published_at": "2020-06-19T17:15:00Z",
    "severity": "HIGH"
  },
  "details": "There is a strong parameters bypass vector in ActionPack.\n\nVersions Affected:  rails \u003c= 6.0.3\nNot affected:       rails \u003c 5.0.0\nFixed Versions:     rails \u003e= 5.2.4.3, rails \u003e= 6.0.3.1\n\nImpact\n------\nIn some cases user supplied information can be inadvertently leaked from\nStrong Parameters.  Specifically the return value of `each`, or `each_value`,\nor `each_pair` will return the underlying \"untrusted\" hash of data that was\nread from the parameters.  Applications that use this return value may be\ninadvertently use untrusted user input.\n\nImpacted code will look something like this:\n\n```\ndef update\n  # Attacker has included the parameter: `{ is_admin: true }`\n  User.update(clean_up_params)\nend\n\ndef clean_up_params\n   params.each { |k, v|  SomeModel.check(v) if k == :name }\nend\n```\n\nNote the mistaken use of `each` in the `clean_up_params` method in the above\nexample.\n\nWorkarounds\n-----------\nDo not use the return values of `each`, `each_value`, or `each_pair` in your\napplication.",
  "id": "GHSA-8727-m6gj-mc37",
  "modified": "2023-09-25T16:55:14Z",
  "published": "2020-05-26T15:09:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8164"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/292797"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rails/rails"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2020-8164.yml"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/forum/#!topic/rubyonrails-security/f6ioe4sdpbY"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/rubyonrails-security/c/f6ioe4sdpbY"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/06/msg00022.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/07/msg00013.html"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2020/dsa-4766"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00089.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00093.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00107.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Possible Strong Parameters Bypass in ActionPack"
}


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