例如: SQL注入攻击
XSS攻击
复制代码 代码如下:
任意执行代码
文件包含以及CSRF.
}
关于SQL攻击有很多文章还有各种防注入脚本,但是都不能解决SQL注入的根本问题
见代码:
复制代码 代码如下:
mysql_connect("localhost","root","123456")or die("数据库连接失败!");
mysql_select_db("test1");
$user=$_post['uid'];
$pwd=$_POST['pass'];
if(mysql_query("SELECT * from where
admin
= `username`='$user' or `password`='$pwd'"){
echo "用户成功登陆..";
} eles {
echo "用户名或密码出错";
}
?>
很简单的一段代码,功能是用于检测用户名或密码是否正确,可是在一些恶意攻击者中提交一些敏感代码.后果可想而知.. post判断注入的方式有2种。
1.在form表单的文本框输入 "or‘1'=1"或者"and 1=1"
在查询数据库的语句就应该是:
SELECT admin from where login = `user`=''or‘1'=1' or `pass`=‘xxxx'
当然也不会出现什么错误,因为or在sql的语句中代表和,或的意思。当然也会提示错误。
当时我们已经发现了可以执行SQL语句之后就可以查询当前表的所有信息。例如:正确的管理员账户和密码进行登录入侵。。
修复方式1:
使用javascript脚本过滤特殊字符(不推荐,指标不治本)
如果攻击者禁用了javascript还是可以进行SQL注入攻击。。
修复方式2:
使用mysql的自带函数进行过滤。
见代码:
复制代码 代码如下:
// 省略连接数据库等操作。。
$user=mysql_real_escape_string($_POST['user']);
mysql_query("select * from admin whrer `username`='$user'");
?>
既然前面说道了xss攻击,我们再来说说XSS攻击以及防范吧。。
提交表单:
复制代码 代码如下:
接收文件:
复制代码 代码如下:
if(empty($_POST['sub'])){
echo $_POST['test'];
}
很简单的一段代码,在这里只是模拟了下使用场景..
加入攻击者提交
<script>alert(document.cookie);</script>
在返回的页面就应该显示当前页面的cookie信息。
我们可以运用到某些留言板上(提前是没过滤的),然后当管理员审核改条信息时盗取COOKIE信息,并发送到攻击者的空间或者邮箱。。攻击者可以使用cookie修改器进行登陆入侵了。。
当然解决方案也有很多。。下面就介绍一个最常用的方式吧。
修复方案1:使用javascript进行转义
修复方案2:使用php内置函数进行转义
代码如下:
[code]
if(empty($_POST['sub'])){
$str=$_POST['test'];
htmlentities($srt);
echo $srt;
}
[html]
好了,关于SQL注入攻击和XSS攻击的案例与修复方法就讲的差不多了。
当然还有其他的解决方法:
例如:使用php框架
还有其他的一些方法。。当然了,XSS的运用范围与攻击方式很多也很广。本文只针对php的提交方式进行过滤,还有其他的需要自己去研究 ^_^~
此文出此:Aey uhost team(team.hake.cc),转载请带上版权。
y0umer
2012/6/7

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