当前位置：网站首页>SQL injection -- Audit of PHP source code (take SQL lab 1~15 as an example) (super detailed)
SQL injection -- Audit of PHP source code (take SQL lab 1~15 as an example) (super detailed)
2022-07-07 12:23:00 【hcjtn】
sql Inject ——php Source audit （ With sql-lab 1~15 For example ）（ Hyperdetail )
sql Inject
sql Inject ：web The application does not judge the legitimacy of the user's input data , And the parameters passed in are controllable by the attacker , Therefore, the attacker constructs different sql Statement to implement the operation of the database （ Operation on Database ： It is possible to interact with the database ,sql Inject ）
Two key conditions ：1. Parameters available to users .2. Parameters into the database query
SQL Injection is based on personal learning , It can be roughly divided into the following categories ：
Joint query injection （ Integer Injection 、 Character injection 、 Wide byte Injection 、 The secondary injection 、 Stack injection, etc ）
An error injection （ The error reporting function can be roughly divided into updatexml An error injection 、floor An error injection 、extractvalue An error injection 、exp Error reporting, injection, etc ）
Blind note （ Time blind injection 、 Boolean blind note and so on ）The location of our upload points can be roughly divided into GET Inject 、POST Inject 、http Head injection, etc .
Now let's get started sql Code audit of ：
Less-1
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-1 **Error Based- String**</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:70px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
else
{
echo '<font color= "#FFFF00">';
print_r(mysql_error());
echo "</font>";
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-1.jpg" /></center>
</body>
</html>
Before the source code audit, we need to know php Function function ：
error_reporting(0)
error_reporting(0) The function specifies the report of different error levels
<?php
// Turn off error reporting
error_reporting(0);
?>
include("../sql-connections/sql-connect.php");
include The expression contains and runs the specified file .
if(isset($_GET['id']))
if Statement for When the specified condition is true when Execute code ( And c Language ,python identical )
isset($_GET['id'])
isset() Function to detect whether a variable is set and not NULL.
If it has been used unset() After releasing a variable , Re pass isset() The judgment will return to FALSE.
If you use isset() Test one is set to NULL The variable of , Will return FALSE.
At the same time, pay attention to null character （"\0"） Not equivalent to PHP Of NULL Constant .
$id=$_GET['id']; // take $_GET['id'] Assign a value to $id
$id= yes php Variable function of
fopen('result.txt','a');
fopen() Function to open a file or URL.
If opening fails , This function returns FALS
The function syntax ：
fopen(filename,mode,include_path,context)
fwrite($fp,'ID:'.$id."\n");
fwrite() Function write file
grammar ：
fwrite(file,string,length)
fclose($fp);
fclose() Function to close an open file .
mysql_query($sql)
mysql_query() Function to execute a MySQL Inquire about
mysql_fetch_array($result);
mysql_fetch_array() Function takes a row from the result set as an associative array , Or an array of numbers , Or both
Returns an array generated from rows obtained from the result set , If there are no more lines, return false.
echo "<font size='5' color= '#99FF00'>";
echo The output text
eg:
<?php
echo "Hello world!";
?> // Output hello world
print_r(mysql_error());
print_r： Function to print variables （ amount to c In language printf python Medium print）
mysql_error：mysql_error() Function returns the previous MySQL Text error message generated by operation . This function returns the previous MySQL Error text of function , If there is no error, return ‘’（ An empty string ）.
Source code explanation ：
Now we have learned all the original functions of the source code , Let's start the source code audit ：
From the source code, we can see that we do it directly on the web GET Upload
$id=$_GET['id'];
And you can find ：
its sql Variables can go directly to sql Query in a statement
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
The content obtained from the database can be directly displayed on the page ：
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
less-2
Source code is as follows :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-2 **Error Based- Intiger**</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
else
{
echo '<font color= "#FFFF00">';
print_r(mysql_error());
echo "</font>";
}
}
else
{
echo "Please input the ID as parameter with numeric value";
}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-2.jpg" /></center>
</body>
</html>
It was observed that ：less-1 And less-2 The source code of is exactly the same
Please refer to the previous chapter for source code analysis .
less-3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-3 Error Based- String (with Twist) </title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id=('$id') LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
else
Code explanation
The source code of the third level is not much different from the source code of the first level
Just change here ：
$sql="SELECT * FROM users WHERE id=('$id') LIMIT 0,1";
It's not difficult for us to start , The third level is just id The way of wrapping changes from the first level ‘id’ Turn into (’$id’)
therefore , Others and less-1 and less-2 equally
From the source code, we can see that we do it directly on the web GET Upload
$id=$_GET['id'];
And you can find ：
its sql Variables can go directly to sql Query in a statement
$sql="SELECT * FROM users WHERE id=('$id') LIMIT 0,1";
The content obtained from the database can be directly displayed on the page ：
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
less-4
Source code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-4 Error Based- DoubleQuotes String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$id = '"' . $id . '"';
$sql="SELECT * FROM users WHERE id=($id) LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
else
{
echo '<font color= "#FFFF00">';
print_r(mysql_error());
echo "</font>";
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-4.jpg" /></center>
</body>
</html>
Same as the third level It's just the different way of wrapping
$sql="SELECT * FROM users WHERE id=($id) LIMIT 0,1";
From the above source code The package method changes to ($id)
therefore , Others and less-1 and less-2 equally
From the source code, we can see that we do it directly on the web GET Upload
$id=$_GET['id'];
And you can find ：
its sql Variables can go directly to sql Query in a statement
$sql="SELECT * FROM users WHERE id=($id) LIMIT 0,1";
The content obtained from the database can be directly displayed on the page ：
if($row)
{
echo "<font size='5' color= '#99FF00'>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "</font>";
}
less-5
Source code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-5 Double Query- Single Quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
echo "<br>";
echo "</font>";
}
else
{
echo '<font size="3" color="#FFFF00">';
print_r(mysql_error());
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-5.jpg" /></center>
</body>
</html>
Source audit ：
By comparing the source code of the previous level , We found that the source code of the fifth level is less
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
echo 'Your Login name:'. $row['username'];
echo 'Your Password:' .$row['password'];
This means that the content obtained in the database cannot be directly displayed , But there is such a line of code , Echo the database Report errors data ;
echo '<font size="3" color="#FFFF00">';
print_r(mysql_error());
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
therefore , We can naturally think of The error reporting injection mentioned above ：updatexml（ How to report errors , Please follow my related blog ）
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
With this source code, we can find that its package method is ：’$id’
less-6
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-6 Double Query- Double Quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$id = '"'.$id.'"';
$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
echo "<br>";
echo "</font>";
}
else
{
echo '<font size="3" color= "#FFFF00">';
print_r(mysql_error());
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-6.jpg" /></center>
</body>
</html>
Through observation, we found that ：less-6 And less-5 Source code and its similarity
It's just
echo '<font size="3" color="#FFFF00">';
print_r(mysql_error());
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
The content that cannot be obtained in the database cannot be directly displayed , Only error reporting can be injected
It's just that the way of wrapping is different ：
$id = '"'.$id.'"';
$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";
less-7
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-7 Dump into Outfile</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id=(('$id')) LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo '<font color= "#FFFF00">';
echo 'You are in.... Use outfile......';
echo "<br>";
echo "</font>";
}
else
{
echo '<font color= "#FFFF00">';
echo 'You have an error in your SQL syntax';
//print_r(mysql_error());
echo "</font>";
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-7.jpg" /></center>
</body>
Source code analysis ：
Compared with less-5 Source code , We found that less-7 The source code of is less ：
print_r(mysql_error());
Express less-7 Unable to echo the database error data , It represents the above mechanism updatexml The error echo method of is no longer available ,
And in less-7 in It also gives us relevant tips ：
echo 'You are in.... Use outfile......';
In the echo of the previous level is a “You are in…”, However, the source code in this level clearly annotates the code that outputs database errors （ The correct and wrong display of the page is different ）, And there is one on it isset Function to make an input to the folder , Thus, the comparison between right and wrong is realized .
At this time, we should think of using rolle blind injection .（ The usage of Rolle blind note , You can see my related blog ）
less-8
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-8 Blind- Boolian- Single Quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
echo "<br>";
echo "</font>";
}
else
{
echo '<font size="5" color="#FFFF00">';
//echo 'You are in...........';
//print_r(mysql_error());
//echo "You have an error in your SQL syntax";
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-8.jpg" /></center>
</body>
</html>
Source code analysis ：
Through comparison, we found that less-7 and leaa-8 The source code of is not much different , None
print_r(mysql_error());
Can't inject an error , Only blind injection .
Just a different package
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
less-9
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-9 Blind- Time based- Single Quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
echo "<br>";
echo "</font>";
}
else
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
//print_r(mysql_error());
//echo "You have an error in your SQL syntax";
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
Source audit ：
Looking at the source code, we find ：
else
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
//print_r(mysql_error());
//echo "You have an error in your SQL syntax";
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
}
The echo of right and wrong in this level is the same , So we can't use the Boolean blind note used in the last few levels . Now , We can only use the last magic weapon ： Time blind note （ The usage of time blind note , You can see my related blog ）.
less-10
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-10 Blind- Time based- Double Quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:60px;color:#FFF; font-size:23px; text-align:center">Welcome <font color="#FF0000"> Dhakkan </font><br>
<font size="3" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_GET['id']))
{
$id=$_GET['id'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'ID:'.$id."\n");
fclose($fp);
// connectivity
$id = '"'.$id.'"';
$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
echo "<br>";
echo "</font>";
}
else
{
echo '<font size="5" color="#FFFF00">';
echo 'You are in...........';
//print_r(mysql_error());
//echo "You have an error in your SQL syntax";
echo "</br></font>";
echo '<font color= "#0000ff" font size= 3>';
}
}
else {
echo "Please input the ID as parameter with numeric value";}
?>
</font> </div></br></br></br><center>
<img src="../images/Less-10.jpg" /></center>
</body>
</html>
Source code analysis ：
by force of contrast less-9 and less-10 We found that their source code is not much different , It's just that the way of wrapping is different
$id = '"'.$id.'"';
$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";
less-11
Source code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-11- Error Based- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:20px;color:#FFF; font-size:24px; text-align:center"> Welcome <font color="#FF0000"> Dhakkan </font><br></div>
<div align="center" style="margin:40px 0px 0px 520px;border:20px; background-color:#0CF; text-align:center; width:400px; height:150px;">
<div style="padding-top:10px; font-size:15px;">
<!--Form to post the data for sql injections Error based SQL Injection-->
<form action="" name="form1" method="post">
<div style="margin-top:15px; height:30px;">Username :
<input type="text" name="uname" value=""/>
</div>
<div> Password :
<input type="text" name="passwd" value=""/>
</div></br>
<div style=" margin-top:9px;margin-left:90px;">
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</div></div>
<div style=" margin-top:10px;color:#FFF; font-size:23px; text-align:center">
<font size="6" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_POST['uname']) && isset($_POST['passwd']))
{
$uname=$_POST['uname'];
$passwd=$_POST['passwd'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'User Name:'.$uname);
fwrite($fp,'Password:'.$passwd."\n");
fclose($fp);
// connectivity
@$sql="SELECT username, password FROM users WHERE username='$uname' and password='$passwd' LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
//echo '<font color= "#0000ff">';
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in\n\n " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
print_r(mysql_error());
echo "</br>";
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
}
?>
</font>
</div>
</body>
</html>
Source audit ：
Observe less-11 Source code we found this problem and before 10 The transmission mode of the switch is different , by post The ginseng
stay PHP Part and less-1 The source code of is similar :
its sql Variables can go directly to sql Query in a statement
@$sql="SELECT username, password FROM users WHERE username='$uname' and password='$passwd' LIMIT 0,1";
The content obtained from the database can be directly displayed on the page ：
echo '<font size="3" color="#0000ff">';
echo "<br>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
So we can directly use the method of joint parameter transmission .（ and less-1 The same way ）
less-12
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-12- Error Based- Double quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:20px;color:#FFF; font-size:24px; text-align:center"> Welcome <font color="#FF0000"> Dhakkan </font><br></div>
<div align="center" style="margin:40px 0px 0px 520px;border:20px; background-color:#0CF; text-align:center; width:400px; height:150px;">
<div style="padding-top:10px; font-size:15px;">
<!--Form to post the data for sql injections Error based SQL Injection-->
<form action="" name="form1" method="post">
<div style="margin-top:15px; height:30px;">Username :
<input type="text" name="uname" value=""/>
</div>
<div> Password :
<input type="text" name="passwd" value=""/>
</div></br>
<div style=" margin-top:9px;margin-left:90px;">
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</div></div>
<div style=" margin-top:10px;color:#FFF; font-size:23px; text-align:center">
<font size="6" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_POST['uname']) && isset($_POST['passwd']))
{
$uname=$_POST['uname'];
$passwd=$_POST['passwd'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'User Name:'.$uname."\n");
fwrite($fp,'Password:'.$passwd."\n");
fclose($fp);
// connectivity
$uname='"'.$uname.'"';
$passwd='"'.$passwd.'"';
@$sql="SELECT username, password FROM users WHERE username=($uname) and password=($passwd) LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
//echo '<font color= "#0000ff">';
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
print_r(mysql_error());
echo "</br>";
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
}
?>
</font>
</div>
</body>
</html>
Source audit ：
By contrast, we find that less-11 and less-12 be similar , All use post The ginseng , It's just that the way of wrapping is different
$uname='"'.$uname.'"';
$passwd='"'.$passwd.'"';
@$sql="SELECT username, password FROM users WHERE username=($uname) and password=($passwd) LIMIT 0,1";
less-13
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-13- Double Injection- String- with twist</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:20px;color:#FFF; font-size:24px; text-align:center"> Welcome <font color="#FF0000"> Dhakkan </font><br></div>
<div align="center" style="margin:40px 0px 0px 520px;border:20px; background-color:#0CF; text-align:center; width:400px; height:150px;">
<div style="padding-top:10px; font-size:15px;">
<!--Form to post the data for sql injections Error based SQL Injection-->
<form action="" name="form1" method="post">
<div style="margin-top:15px; height:30px;">Username :
<input type="text" name="uname" value=""/>
</div>
<div> Password :
<input type="text" name="passwd" value=""/>
</div></br>
<div style=" margin-top:9px;margin-left:90px;">
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</div></div>
<div style=" margin-top:10px;color:#FFF; font-size:23px; text-align:center">
<font size="6" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_POST['uname']) && isset($_POST['passwd']))
{
$uname=$_POST['uname'];
$passwd=$_POST['passwd'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'User Name:'.$uname."\n");
fwrite($fp,'Password:'.$passwd."\n");
fclose($fp);
// connectivity
@$sql="SELECT username, password FROM users WHERE username=('$uname') and password=('$passwd') LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
//echo '<font color= "#0000ff">';
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
//echo 'Your Login name:'. $row['username'];
//echo "<br>";
//echo 'Your Password:' .$row['password'];
//echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
print_r(mysql_error());
echo "</br>";
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
}
?>
</font>
</div>
</body>
</html>
Source code analysis ：
It's not hard to find out by comparison ,less-13 Less ：
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
echo 'Your Login name:'. $row['username'];
echo "<br>";
echo 'Your Password:' .$row['password'];
echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
This means that the content obtained in the database cannot be directly displayed , But there is such a line of code , Echo the database Report errors data ;
print_r(mysql_error());
To recall less-5 We naturally use updatexml Error reporting method ;
Finally, you must remember to observe id The wrapping method ：
@$sql="SELECT username, password FROM users WHERE username=('$uname') and password=('$passwd') LIMIT 0,1";
less-14
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-14- Double Injection- Double quotes- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:20px;color:#FFF; font-size:24px; text-align:center"> Welcome <font color="#FF0000"> Dhakkan </font><br></div>
<div align="center" style="margin:40px 0px 0px 520px;border:20px; background-color:#0CF; text-align:center; width:400px; height:150px;">
<div style="padding-top:10px; font-size:15px;">
<!--Form to post the data for sql injections Error based SQL Injection-->
<form action="" name="form1" method="post">
<div style="margin-top:15px; height:30px;">Username :
<input type="text" name="uname" value=""/>
</div>
<div> Password :
<input type="text" name="passwd" value=""/>
</div></br>
<div style=" margin-top:9px;margin-left:90px;">
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</div></div>
<div style=" margin-top:10px;color:#FFF; font-size:23px; text-align:center">
<font size="6" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_POST['uname']) && isset($_POST['passwd']))
{
$uname=$_POST['uname'];
$passwd=$_POST['passwd'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'User Name:'.$uname."\n");
fwrite($fp,'Password:'.$passwd."\n");
fclose($fp);
// connectivity
$uname='"'.$uname.'"';
$passwd='"'.$passwd.'"';
@$sql="SELECT username, password FROM users WHERE username=$uname and password=$passwd LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
//echo '<font color= "#0000ff">';
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
//echo 'Your Login name:'. $row['username'];
//echo "<br>";
//echo 'Your Password:' .$row['password'];
//echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
print_r(mysql_error());
echo "</br>";
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
}
?>
</font>
</div>
</body>
</html>
Source audit ：
Observation found that ：
less-14 and less-15 It's not that different , It's just the different wrapping methods ：
$uname='"'.$uname.'"';
$passwd='"'.$passwd.'"';
@$sql="SELECT username, password FROM users WHERE username=$uname and password=$passwd LIMIT 0,1";
less-15
Source code is as follows ：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Less-15- Blind- Boolian Based- String</title>
</head>
<body bgcolor="#000000">
<div style=" margin-top:20px;color:#FFF; font-size:24px; text-align:center"> Welcome <font color="#FF0000"> Dhakkan </font><br></div>
<div align="center" style="margin:40px 0px 0px 520px;border:20px; background-color:#0CF; text-align:center; width:400px; height:150px;">
<div style="padding-top:10px; font-size:15px;">
<!--Form to post the data for sql injections Error based SQL Injection-->
<form action="" name="form1" method="post">
<div style="margin-top:15px; height:30px;">Username :
<input type="text" name="uname" value=""/>
</div>
<div> Password :
<input type="text" name="passwd" value=""/>
</div></br>
<div style=" margin-top:9px;margin-left:90px;">
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</div></div>
<div style=" margin-top:10px;color:#FFF; font-size:23px; text-align:center">
<font size="6" color="#FFFF00">
<?php
//including the Mysql connect parameters.
include("../sql-connections/sql-connect.php");
error_reporting(0);
// take the variables
if(isset($_POST['uname']) && isset($_POST['passwd']))
{
$uname=$_POST['uname'];
$passwd=$_POST['passwd'];
//logging the connection parameters to a file for analysis.
$fp=fopen('result.txt','a');
fwrite($fp,'User Name:'.$uname);
fwrite($fp,'Password:'.$passwd."\n");
fclose($fp);
// connectivity
@$sql="SELECT username, password FROM users WHERE username='$uname' and password='$passwd' LIMIT 0,1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
if($row)
{
//echo '<font color= "#0000ff">';
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in\n\n " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
//echo 'Your Login name:'. $row['username'];
echo "<br>";
//echo 'Your Password:' .$row['password'];
echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
//print_r(mysql_error());
echo "</br>";
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
}
?>
</font>
</div>
</body>
</html>
Source audit ：
Compared with less-13 Different less-15 It's missing ：
print_r(mysql_error());
And looking at the source code, we found , When we type in , The page displays correctly and incorrectly in different ways ：
if($row)
{
//echo '<font color= "#0000ff">';
echo "<br>";
echo '<font color= "#FFFF00" font size = 4>';
//echo " You Have successfully logged in\n\n " ;
echo '<font size="3" color="#0000ff">';
echo "<br>";
//echo 'Your Login name:'. $row['username'];
echo "<br>";
//echo 'Your Password:' .$row['password'];
echo "<br>";
echo "</font>";
echo "<br>";
echo "<br>";
echo '<img src="../images/flag.jpg" />';
echo "</font>";
}
else
{
echo '<font color= "#0000ff" font size="3">';
//echo "Try again looser";
//print_r(mysql_error());
echo "</br>";
echo "</br>";
echo "</br>";
echo '<img src="../images/slap.jpg" />';
echo "</font>";
}
Thinking of the seventh level, we decided to use Boolean blind note .
Finally, observe the package method ：
@$sql="SELECT username, password FROM users WHERE username='$uname' and password='$passwd' LIMIT 0,1";
Be careful ：
If someone has done it less-15 You will find ：
less-9 The input is ：
Parsing library name length ： ?id=1' and if(length(database())=8,sleep(5),1)-- q Resolve database name ：?id=1' and if((ascii(substr(database(),1,1))=115),sleep(5),1)-- q
Resolve table name ： ?id=1' and if((ascii(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1))=101),sleep(5),1)-- q Resolve field name ：?id=1' and if((ascii(substr((select column_name from information_schema.columns where table_schema='security' and table_name='emails' limit 0,1),1,1))=105),sleep(5),1)-- q
less-15 The input is
Determine the database length ：'or (length(database()))=8-- q Judge the database name ：'or (ascii(substr(database(),1,1)))=115-- q
The name of the judgment table ：'or (ascii(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1)))=101-- q Determine the name of the column :'or (ascii(substr((select column_name from information_schema.columns where table_schema='security' and table_name='emails' limit 0,1),1,1)))=105-- q
There will be such a doubt ： Why? , Jiuguan Wei and It's fifteen years for or
Let's look at the source code ：
less-9：
$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
less-15：
@$sql="SELECT username, password FROM users WHERE username='$uname' and password='$passwd' LIMIT 0,1";
Observe the source code of these two sentences , It's not hard to see. If we use and Will become ：
@$sql="SELECT username, password FROM users WHERE username='$uname' 'or (length(database()))=8-- q and password='$passwd' LIMIT 0,1";
Obviously not , Because we don't know username Value . If you use or, Then the following value holds Just Established as a whole . And in the 9 In question id=1 Is established, so it can be used and As a connection of statements .
边栏推荐
- Simple network configuration for equipment management
- 防红域名生成的3种方法介绍
- PowerShell cs-utf-16le code goes online
- [data clustering] realize data clustering analysis based on multiverse optimization DBSCAN with matlab code
- [texture feature extraction] LBP image texture feature extraction based on MATLAB local binary mode [including Matlab source code 1931]
- 盘点JS判断空对象的几大方法
- Flet教程之 15 GridView 基础入门（教程含源码）
- 跨域问题解决方案
- Flet教程之 17 Card卡片组件 基础入门（教程含源码）
- Upgrade from a tool to a solution, and the new site with praise points to new value
猜你喜欢
数据库系统原理与应用教程（010）—— 概念模型与数据模型练习题
![112.网络安全渗透测试—[权限提升篇10]—[Windows 2003 LPK.DDL劫持提权＆msf本地提权]](/img/b6/6dfe9be842204567096d1f4292e8e7.png)
112.网络安全渗透测试—[权限提升篇10]—[Windows 2003 LPK.DDL劫持提权＆msf本地提权]
![An error occurred when vscade tried to create a file in the target directory: access denied [resolved]](/img/14/9899f5a765872fb3238be4305a2dc7.png)
An error occurred when vscade tried to create a file in the target directory: access denied [resolved]
Introduction and application of smoothstep in unity: optimization of dissolution effect
2022 8th "certification Cup" China University risk management and control ability challenge
NPC Jincang was invited to participate in the "aerospace 706" I have an appointment with aerospace computer "national Partner Conference
Hi3516全系统类型烧录教程
Processing strategy of message queue message loss and repeated message sending
ENSP MPLS layer 3 dedicated line
Fleet tutorial 15 introduction to GridView Basics (tutorial includes source code)
随机推荐
EPP+DIS学习之路（1）——Hello world！
ES底层原理之倒排索引
NPC Jincang was invited to participate in the "aerospace 706" I have an appointment with aerospace computer "national Partner Conference
2022 年第八届“认证杯”中国高校风险管理与控制能力挑战赛
Introduction to three methods of anti red domain name generation
Hi3516 full system type burning tutorial
Basic introduction to the 16 tabs tab control in the fleet tutorial (the tutorial includes source code)
关于 Web Content-Security-Policy Directive 通过 meta 元素指定的一些测试用例
Idea 2021 Chinese garbled code
Mise en œuvre du codage Huffman et du décodage avec interface graphique par MATLAB
Simple network configuration for equipment management
Inverted index of ES underlying principle
When OSPF specifies that the connection type is P2P, it enables devices on both ends that are not in the same subnet to Ping each other
The road to success in R & D efficiency of 1000 person Internet companies
Solve server returns invalid timezone Go to ‘Advanced’ tab and set ‘serverTimezone’ property manually
《看完就懂系列》天哪！搞懂节流与防抖竟简单如斯~
数据库系统原理与应用教程（008）—— 数据库相关概念练习题
免备案服务器会影响网站排名和权重吗?
【玩转 RT-Thread】 RT-Thread Studio —— 按键控制电机正反转、蜂鸣器
Improve application security through nonce field of play integrity API