目录

文章目录

• 目录
• 事先说明
• SQL注入
• 描述
• 问题1：怎么发现SQL注入漏洞？
• 问题2：如何防御SQL注入？
• 问题3：CTF选手如何绕过过滤？

事先说明

不喜勿喷哦！另外有什么问题不要私信我，我没有时间看，在文章下方留言即可，还有，该文章中的所有技术均为本人自己研究所得，不要抄袭哦！请遵守法律

SQL注入

描述

第一种攻击方式是SQL注入。这是一个在CTF中非常常见的题，基本上每次比赛都会有SQL注入的相关题目。
简单来说，SQL注入就是开发者在开发网站是，直接将用户的输入信息与SQL语句进行拼接，导致黑客可以直接在输入框输入SQL语句，从而操纵SQL语句的实现。

<?php...$input = $_GET[\'input\'];$get = \"SELECT username From users WHERE username = \'$input\'\";...

这是个典型的SQL注入的源代码。input变量代入SQL语句，所以导致用户可以自由控制SQL语句。

问题1：怎么发现SQL注入漏洞？

对于很多网络安全初学者来说，SQL注入是必修课，但是有时候，我们并不能直接看到PHP源代码，在HTML5的源代码中也很难发现。那么我们可以利用工具来帮助我们来查询SQL注入漏洞
如果你是Kali的使用者，你可以尝试使用SQLmap，当然也可以通过啊D注入工具直接注入。

问题2：如何防御SQL注入？

这个问题可以从两个方向考虑。
从根源上：
既然直接拼接代码会出错，那么我们只要不直接拼接不就完了吗！我们可以使用数组或者数据库来防御SQL注入漏洞。

从过滤上：
我们可以限制用户的输入权限。例如用户不能输入where，from等SQL敏感字符。我们通过创建过滤函数来实现。

问题3：CTF选手如何绕过过滤？

在CTF比赛上，通常不会只是简单的SQL注入，出题人通常都会通过一些过滤函数来加大题目的难度，那么我们就可以利用语言的特性来绕过。
首先，SQL语句是没有大小写敏感的，加入网站的过滤函数的目标列表如下:

target = [\"where\"\"from\"\"union\"......]

那么我们在注入的时候，我们可以使用

WhERe

的类似方法来过滤。
如果过滤函数会过滤空格，注意，我们可以用注释的方法来代替空格;

/* */, #, //......

$name/**/=/**/$_GET[\'input\'];

还有很多过滤的方法，你可以慢慢探索。

Jother编码加解密

这是本章的第二个大板块。Jother是个非常有意思的加密方法，我们看一下：

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我们看到，这只是用（）{}[]!+这八个字符组成的。你觉得很长是不是？那好，我们来看一下解码之后是什么结果：

<button onclick=\"click()\">按钮</button>

震惊吗？短短一行代码，可以那么长？不过Jother加密的方法固然好，那就是：太难解码。但是我们有工具，这里给大家一个在线的加解密工具：
http://tmxk.org/jother/
字数马上就3w+了，感觉之前的文章都***白写了。

结束

由于这是第一次些，所以我们暂时就那么多。
再见！