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【Web安全】PHP反序列化漏洞

  • 2026-03-25 02:54:00
【Web安全】PHP反序列化漏洞
什么是 PHP 反序列化?
你可以把 PHP 的 “序列化” 想象成打包行李:
当程序需要把对象(比如用户信息、配置数据)保存或传输时,会把对象的属性、类型等信息“打包” 成一串字符串(比如 O:8:"UserInfo":2:{s:4:"name";s:5:"张三";s:3:"age";i:20;}),这就是“序列化”。
而“反序列化” 就是拆行李:程序把这串字符串还原成原来的对象,方便后续使用。
本来这是个实用功能,但如果“拆行李” 时没检查包裹里有没有 “危险品”,就会引发漏洞 —— 这就是「PHP 反序列化漏洞」。
为什么会被攻击?
漏洞的根源就一个:程序接收了不可信的序列化字符串,并且直接调用了反序列化函数(unserialize ())。
举个通俗的例子:
你是酒店前台(程序),客人(攻击者)说“这是我的行李(序列化字符串),帮我拆开”。你没检查行李里是不是有刀枪(恶意代码),直接拆开,结果就出了事。
具体技术逻辑:
PHP 反序列化时,会自动触发对象的某些 “魔术方法”(比如 __wakeup() 唤醒对象时执行、__destruct() 对象销毁时执行)。如果攻击者构造恶意的序列化字符串,就能让这些魔术方法执行预设的恶意代码(比如删文件、读数据库)。
攻击者是怎么操作的?
  1. 正常的 PHP 代码(有漏洞)

<?php

// 定义一个用户类

class User {

public $name;

// 魔术方法:对象被销毁时执行

public function __destruct() {

// 执行$name里的内容(危险!直接执行用户输入)

eval($this->name);

}

}

// 接收用户传入的序列化字符串(无过滤)

$user_input = $_GET['data'];

// 反序列化(触发漏洞)

unserialize($user_input);

?>

2. 攻击者的操作
攻击者需要构造一个序列化字符串,让$name 变成恶意代码(比如读取服务器密码文件):
第一步:创建恶意对象

<?php

class User {

public $name = "system('cat /etc/passwd');"; // 读取密码文件

}

// 序列化这个对象,得到攻击字符串

echo serialize(new User());

?>

第二步:执行攻击
把得到的序列化字符串作为data 参数传入:
http://xxx.com/vuln.php?data=O:4:"User":1:{s:4:"name";s:26:"system('cat /etc/passwd');";}
程序反序列化后,会触发__destruct() 方法,执行system('cat /etc/passwd'),攻击者就能拿到服务器密码文件。
漏洞防范:怎么堵住这个坑?

记住核心原则:不要信任任何外部输入,尤其是反序列化的数据,具体做法分 5 点:

1. 避免直接反序列化不可信数据

这是最根本的办法!如果不是必须,不要让用户传入序列化字符串。如果必须用,优先用更安全的格式(比如 JSON)替代。

2. 过滤 验证输入

对传入的序列化字符串进行过滤,禁止包含evalsystemexec等危险函数;

验证序列化字符串的格式(比如长度、类名),只允许指定的类被反序列化(比如只允许User类,拒绝其他未知类)。

3. 禁用危险魔术方法

如果不需要,尽量避免使用__destruct()__wakeup()__call()等魔术方法,或者在这些方法里不要执行用户可控的代码。

4. 限制 PHP 函数执行权限

通过php.ini配置disable_functions,禁用evalsystemexecpassthru等危险函数:

disable_functions = eval,system,exec,passthru,shell_exec

5. 升级 PHP 版本

PHP 官方会修复已知的反序列化漏洞,及时升级到最新稳定版(比如 PHP 7.4+PHP 8.x),可以避免旧版本的漏洞被利用。

总结
PHP 反序列化漏洞的本质是 “信任了不可信的输入,并且执行了恶意代码”。对于开发者来说,核心是 “不直接执行用户可控的代码”;对于普通读者,了解这个漏洞后,也能明白 “为什么有些网站不让你随便上传文件 / 输入特殊字符”—— 都是为了防范类似的攻击。
如果你的网站用了 PHP,赶紧检查一下有没有直接反序列化用户输入的代码,按照上面的方法加固吧!
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  1. CONNECT:[ UseTime:0.000584s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000815s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000247s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000453s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000501s ]
  8. SELECT * FROM `article` WHERE `id` = 480785 LIMIT 1 [ RunTime:0.000387s ]
  9. UPDATE `article` SET `lasttime` = 1774570210 WHERE `id` = 480785 [ RunTime:0.006511s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000259s ]
  11. SELECT * FROM `article` WHERE `id` < 480785 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000441s ]
  12. SELECT * FROM `article` WHERE `id` > 480785 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002278s ]
  13. SELECT * FROM `article` WHERE `id` < 480785 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001241s ]
  14. SELECT * FROM `article` WHERE `id` < 480785 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000941s ]
  15. SELECT * FROM `article` WHERE `id` < 480785 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002566s ]
0.087459s