challenge 1
php code：
 

#GOAL: get password from admin;
error_reporting(0);
require 'db.inc.php';
  
function clean($str){
    if(get_magic_quotes_gpc()){
        $str=stripslashes($str);
    }
    return htmlentities($str, ENT_QUOTES);
}
  
$username = @clean((string)$_GET['username']);
$password = @clean((string)$_GET['password']);
  
$query='SELECT * FROM users WHERE name=\''.$username.'\' AND pass=\''.$password.'\';';
$result=mysql_query($query);
if(!$result || mysql_num_rows($result) < 1){
    die('Invalid password!');
}
  
$row = mysql_fetch_assoc($result);
  
echo "Hello ".$row['name']."</br>";
echo "Your password is:".$row['pass']."</br>";

攻略：
在单引号内的mysql注入，核心就是逃脱单引号，要么生成一个(htmlentities了单引号，不太可能)，要么...干掉一个。
所以：
challenge 2
php code：
 

#GOAL: gather some phpinfo();
  
$str=@(string)$_GET['str'];
eval('$str="'.addslashes($str).'";');

攻略：
eval('$str="'.addslashes($str).'";');这段最后成为php代码 $str=""，里双引号被addslashes，但内容在双引号内可以${${这里执行代码}}
所以：
challenge 3
php code:
 

# GOAL: dump the info for the secret id
require 'db.inc.php';
  
$id = @(float)$_GET['id'];
  
$secretId = 1;
if($id == $secretId){
    echo 'Invalid id ('.$id.').';
}
else{
    $query = 'SELECT * FROM users WHERE id = \''.$id.'\';';
    $result = mysql_query($query);
    $row = mysql_fetch_assoc($result);
  
    echo "id: ".$row['id']."</br>";
    echo "name:".$row['name']."</br>";
}

攻略：
主要是利用php和mysql对float数字型支持的精度不同，精度小的会忽略不能支持的位数。
所以：
challenge 4
php code:
 

#GOAL:get password from admin
# $yourInfo=array(
#   'id'    => 1,
#   'name'  => 'admin',
#   'pass'  => 'xxx',
#   'level' => 1
# );
require 'db.inc.php';
  
$_CONFIG['extraSecure']=true;
  
//if register globals = on, undo var overwrites
foreach(array('_GET','_POST','_REQUEST','_COOKIE') as $method){
     foreach($$method as $key=>$value){
          unset($$key);
     }
}
  
$kw = isset($_GET['kw']) ? trim($_GET['kw']) : die('Please enter in a search keyword.');
  
if($_CONFIG['extraSecure']){
     $kw=preg_replace('#[^a-z0-9_-]#i','',$kw);
}
  
$query = 'SELECT * FROM messages WHERE message LIKE \'%'.$kw.'%\';';
  
$result = mysql_query($query);
$row = mysql_fetch_assoc($result);
  
echo "id: ".$row['id']."</br>";
echo "message: ".$row['message']."</br>";

攻略：
这段$kw在单引号里，看起来只要能使用单引号就行，所以干掉_CONFIG['extraSecure']就ok，刚好前面画蛇添足的有可利用的变量unset(不然咋通关？)，然后就是联合查询了。
所以：
challenge 5
php code：
 

# GOAL: overwrite password for admin (id=1)
#       Try to login as admin
# $yourInfo=array( //this is your user data in the db
#   'id'    => 8,
#   'name'  => 'jimbo18714',
#   'pass'  => 'MAYBECHANGED',
#   'level' => 1
# );
require 'db.inc.php';
  
function mres($str) {
    return mysql_real_escape_string($str);
}
  
$userInfo = @unserialize($_GET['userInfo']);
  
$query = 'SELECT * FROM users WHERE id = \''.mres($userInfo['id']).'\' AND pass = \''.mres($userInfo['pass']).'\';';
  
$result = mysql_query($query);
if(!$result || mysql_num_rows($result) < 1){
    die('Invalid password!');
}
  
$row = mysql_fetch_assoc($result);
foreach($row as $key => $value){
    $userInfo[$key] = $value;
}
  
$oldPass = @$_GET['oldPass'];
$newPass = @$_GET['newPass'];
if($oldPass == $userInfo['pass']){
    $userInfo['pass'] = $newPass;
    $query = 'UPDATE users SET pass = \''.mres($newPass).'\' WHERE id = \''.mres($userInfo['id']).'\';';
    mysql_query($query);
    echo 'Password Changed.';
}
else{
    echo 'Invalid old password entered.';
}

攻略：
(1) http://www.80vul.com/webzine_0x06/PSTZine_0x06_0x03.txt (站上默认显示的密码就是个提示...估计是哪位大虾顺手改的)
(2) $userInfo['pass'] = $newPass; //这句，改成1
所以：
(1) 修改jimbo18714密码为8 (2) 再次修改密码，提交时userInfo为8的序列化,newPass为1
challenge 6
php code：
 

#GOAL: get the secret;
  
class just4fun {
    var $enter;
    var $secret;
}
  
if (isset($_GET['pass'])) {
    $pass = $_GET['pass'];
  
    if(get_magic_quotes_gpc()){
        $pass=stripslashes($pass);
    }
  
    $o = unserialize($pass);
  
    if ($o) {
        $o->secret = "?????????????????????????????";
        if ($o->secret === $o->enter)
            echo "Congratulation! Here is my secret: ".$o->secret;
        else 
            echo "Oh no... You can't fool me";
    }
    else echo "are you trolling?";
}

攻略：
serialize一个just4fun的对象，序列化之前先赋值给$o->enter (在本地执行是成功的，php4fun.sinaapp.com不行，代码改了？)
所以：
(1) 生成序列化的对象
 

class just4fun {
    var $enter;
    var $secret;
}
  
$a=new just4fun();
$a->enter='?????????????????????????????';
echo urlencode(serialize($a));

(2)
challenge 7
php code:
 

# GOAL: get the key from $hidden_password[207]
  
session_start();
error_reporting(0);
  
function auth($password, $hidden_password) {
    $res = 0;
    if(isset($password) && $password != "") {
        if($password == $hidden_password) {
            $res = 1;
        }
    }
    $_SESSION["logged"] = $res;
    return $res;
}
  
function display($res){
    $aff = htmlentities($res);
    return $aff;
}
  
  
if(!isset($_SESSION["logged"]))
    $_SESSION["logged"] = 0;
  
$aff = "";
include("config.inc.php");
  
foreach($_REQUEST as $request) {
    if(is_array($request)) {
        die("Can not use Array in request!");
    }
}
  
$password = $_POST["password"];
  
if(!ini_get("register_globals")) {
    $superglobals = array($_POST, $_GET);
    if(isset($_SESSION)) {
        array_unshift($superglobals, $_SESSION);
    }
    foreach($superglobals as $superglobal) {
        extract($superglobal, 0);
    }
}
  
if((isset($password) && $password != "" && auth($password, $hidden_password[207]) == 1) || (is_array($_SESSION) && $_SESSION["logged"] == 1)) {
    $aff = display("$hidden_password[207]");
} else {
    $aff = display("Try again");
}
echo $aff;

攻略：
get the key from $hidden_password[207] 这句有点模糊，下面的‘所以’可以得到key（绕过REQUEST对数组的判断）
所以：
challenge 8
php code：
 

#GOAL: file_get_content('sbztz.php')    : )
  
    class just4fun {
        public $filename;
  
        function __toString() {
            return @file_get_contents($this->filename);
        }
    }
  
    $data = stripslashes($_GET['data']);
    if (!$data) {
        die("hello from y");
    }
  
    $token = $data[0];
    $pass = true; 
  
    switch ( $token ) {
        case 'a' :
        case 'O' :
        case 'b' :
        case 'i' :
        case 'd' :
            $pass = ! (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
            break;
  
        default:
            $pass = false;
  
    }
  
    if (!$pass) {
      die("TKS L.N.");
    }
  
    echo unserialize($data);

攻略：
http://www.2cto.com/Article/201309/243668.html
http://www.2cto.com/kf/201309/246310.html

所以：
(1) 生成利用的data:
(2)