PHP的反序列化POP链利用研究

...

if (isset($_GET[‘username‘]) && isset($_GET[‘password‘])){
    $username = $_GET[‘username‘];
    $password = $_GET[‘password‘];
    $player = new player($username, $password);
    file_put_contents("caches/".md5($_SERVER[‘REMOTE_ADDR‘]), write(serialize($player))); 
    echo sprintf(‘Welcome %s, your ip is %s\n‘, $username, $_SERVER[‘REMOTE_ADDR‘]);
}
else{
    echo "Please input the username or password!\n";
}

...

<?php
function read($data){
    $data = str_replace(‘\0*\0‘, chr(0)."*".chr(0), $data);
    var_dump($data);
    return $data;
}
function write($data){
    $data = str_replace(chr(0)."*".chr(0), ‘\0*\0‘, $data);

    return $data;
}

function check($data)
{
    if(stristr($data, ‘name‘)!==False){
        die("Name Pass\n");
    }
    else{
        return $data;
    }
}
?>

...
@$player = unserialize(read(check(file_get_contents("caches/".md5($_SERVER[‘REMOTE_ADDR‘])))));
...

<?php
class player{
    protected $user;
    protected $pass;
    protected $admin;

    public function __construct($user, $pass, $admin = 0){
        $this->user = $user;
        $this->pass = $pass;
        $this->admin = $admin;
    }

    public function get_admin(){
        $this->admin = 1;
        return $this->admin ;
    }
}

class topsolo{
    protected $name;

    public function __construct($name = ‘Riven‘){
        $this->name = $name;
    }

    public function TP(){
        if (gettype($this->name) === "function" or gettype($this->name) === "object"){
            $name = $this->name;
            $name();
        }
    }

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

}

class midsolo{
    protected $name;

    public function __construct($name){
        $this->name = $name;
    }

    public function __wakeup(){
        if ($this->name !== ‘Yasuo‘){
            $this->name = ‘Yasuo‘;
            echo "No Yasuo! No Soul!\n";
        }
    }


    public function __invoke(){
        $this->Gank();
    }

    public function Gank(){
        if (stristr($this->name, ‘Yasuo‘)){
            echo "Are you orphan?\n";
        }
        else{
            echo "Must Be Yasuo!\n";
        }
    }
}
class jungle{
    protected $name = "";

    public function __construct($name = "Lee Sin"){
        $this->name = $name;
    }

    public function KS(){
        system("cat /flag");
    }

    public function __toString(){
        $this->KS();  
        return "";  
    }

}
?>