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Data is one of the most vital components of information systems. Database powered web applications are used by the organization to get data from customers. SQL is the acronym for Structured Query Language. It is used to retrieve and manipulate data in the database.

CC & CVV/FULL INFO/Accounts/SSN. Threads 43 Messages 3.5K. Threads 71 Messages 501. Threads 71 Messages 501. Looking for trusted Clone Card Seller. SQL injection (also known as SQL fishing) is a technique often used to attack data driven applications. This is done by including portions of SQL statements in an entry field in an attempt to get the website to pass a newly formed rogue SQL command to the database (e.g., dump the database contents to the attacker).

What is a SQL Injection?

SQL Injection is an attack that poisons dynamic SQL statements to comment out certain parts of the statement or appending a condition that will always be true. It takes advantage of the design flaws in poorly designed web applications to exploit SQL statements to execute malicious SQL code.

In this tutorial, you will learn SQL Injection techniques and how you can protect web applications from such attacks.

How SQL Injection Works

The types of attacks that can be performed using SQL injection vary depending on the type of database engine. The attack works on dynamic SQL statements. A dynamic statement is a statement that is generated at run time using parameters password from a web form or URI query string.

Let’s consider a simple web application with a login form. The code for the HTML form is shown below.

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HERE,

  • The above form accepts the email address, and password then submits them to a PHP file named index.php.
  • It has an option of storing the login session in a cookie. We have deduced this from the remember_me checkbox. It uses the post method to submit data. This means the values are not displayed in the URL.

Let’s suppose the statement at the backend for checking user ID is as follows

SELECT * FROM users WHERE email = $_POST['email'] AND password = md5($_POST['password']);

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  • The above statement uses the values of the $_POST[] array directly without sanitizing them.
  • The password is encrypted using MD5 algorithm.

We will illustrate SQL injection attack using sqlfiddle. Open the URL http://sqlfiddle.com/ in your web browser. You will get the following window.

Note: you will have to write the SQL statements

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Step 1) Enter this code in left pane

Step 2) Click Build Schema

Step 3) Enter this code in right pane

select * from users;

Step 4) Click Run SQL. You will see the following result

Suppose user supplies This email address is being protected from spambots. You need JavaScript enabled to view it. and 1234 as the password. The statement to be executed against the database would be

SELECT * FROM users WHERE email = 'This email address is being protected from spambots. You need JavaScript enabled to view it.' AND password = md5('1234');

Vengeance sample full 38 pack. The above code can be exploited by commenting out the password part and appending a condition that will always be true. Let’s suppose an attacker provides the following input in the email address field.

This email address is being protected from spambots. You need JavaScript enabled to view it.' OR 1 = 1 LIMIT 1 -- ' ]

xxx for the password.

The generated dynamic statement will be as follows.

SELECT * FROM users WHERE email = 'This email address is being protected from spambots. You need JavaScript enabled to view it.' OR 1 = 1 LIMIT 1 -- ' ] AND password = md5('1234');

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HERE,

  • This email address is being protected from spambots. You need JavaScript enabled to view it. ends with a single quote which completes the string quote
  • OR 1 = 1 LIMIT 1 is a condition that will always be true and limits the returned results to only one record.
  • -- ' AND … is a SQL comment that eliminates the password part.

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Copy the above SQL statement and paste it in SQL FiddleRun SQL Text box as shown below

Hacking Activity: SQL Inject a Web Application

We have a simple web application at http://www.techpanda.org/that is vulnerable to SQL Injection attacks for demonstration purposes only. The HTML form code above is taken from the login page. The application provides basic security such as sanitizing the email field. This means our above code cannot be used to bypass the login.

To get round that, we can instead exploit the password field. The diagram below shows the steps that you must follow

Let’s suppose an attacker provides the following input

  • Step 1: Enter This email address is being protected from spambots. You need JavaScript enabled to view it. as the email address
  • Step 2: Enter xxx') OR 1 = 1 -- ]
  • Click on Submit button
  • You will be directed to the dashboard

The generated SQL statement will be as follows

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SELECT * FROM users WHERE email = 'This email address is being protected from spambots. You need JavaScript enabled to view it.' AND password = md5('xxx') OR 1 = 1 -- ]');

The diagram below illustrates the statement has been generated.

HERE,

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  • The statement intelligently assumes md5 encryption is used
  • Completes the single quote and closing bracket
  • Appends a condition to the statement that will always be true

In general, a successful SQL Injection attack attempts a number of different techniques such as the ones demonstrated above to carry out a successful attack.

Other SQL Injection attack types

SQL Injections can do more harm than just by passing the login algorithms. Some of the attacks include

  • Deleting data
  • Updating data
  • Inserting data
  • Executing commands on the server that can download and install malicious programs such as Trojans
  • Exporting valuable data such as credit card details, email, and passwords to the attacker’s remote server
  • Getting user login details etc

The above list is not exhaustive; it just gives you an idea of what SQL Injection

Automation Tools for SQL Injection

In the above example, we used manual attack techniques based on our vast knowledge of SQL. There are automated tools that can help you perform the attacks more efficiently and within the shortest possible time. These tools include

  • SQLSmack - https://securiteam.com/tools/5GP081P75C
  • SQLPing 2 - http://www.sqlsecurity.com/downloads/sqlping2.zip?attredirects=0&d=1
  • SQLMap - http://sqlmap.org/

How to Prevent against SQL Injection Attacks

An organization can adopt the following policy to protect itself against SQL Injection attacks. How to install mods in mortal kombat komplete edition.

  • User input should never be trusted - It must always be sanitized before it is used in dynamic SQL statements.
  • Stored procedures – these can encapsulate the SQL statements and treat all input as parameters.
  • Prepared statements –prepared statements to work by creating the SQL statement first then treating all submitted user data as parameters. This has no effect on the syntax of the SQL statement.
  • Regular expressions –these can be used to detect potential harmful code and remove it before executing the SQL statements.
  • Database connection user access rights –only necessary access rights should be given to accounts used to connect to the database. This can help reduce what the SQL statements can perform on the server.
  • Error messages –these should not reveal sensitive information and where exactly an error occurred. Simple custom error messages such as “Sorry, we are experiencing technical errors. The technical team has been contacted. Please try again later” can be used instead of display the SQL statements that caused the error.

Hacking Activity: Use Havij for SQL Injection

In this practical scenario, we are going to use Havij Advanced SQL Injection program to scan a website for vulnerabilities.

Note: your anti-virus program may flag it due to its nature. You should add it to the exclusions list or pause your anti-virus software.

The image below shows the main window for Havij

The above tool can be used to assess the vulnerability of a web site/application.

Summary

  • SQL Injection is an attack type that exploits bad SQL statements
  • SQL injection can be used to bypass login algorithms, retrieve, insert, and update and delete data.
  • SQL injection tools include SQLMap, SQLPing, and SQLSmack, etc.
  • A good security policy when writing SQL statement can help reduce SQL injection attacks.

Overview

A SQL injection attack consists of insertionor “injection” of a SQL query via the input data from the client to theapplication. A successful SQL injection exploit can read sensitive datafrom the database, modify database data (Insert/Update/Delete), executeadministration operations on the database (such as shutdown the DBMS),recover the content of a given file present on the DBMS file system andin some cases issue commands to the operating system. SQL injectionattacks are a type of injection attack, in which SQL commandsare injected into for itemName, then the query becomes the following:

The addition of the OR 'a'='a' condition causes the where clause toalways evaluate to true, so the query becomes logically equivalent tothe much simpler query:

SELECT * FROM items;

This simplification of the query allows the attacker to bypass therequirement that the query only return items owned by the authenticateduser; the query now returns all entries stored in the items table,regardless of their specified owner.

Example 3

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This example examines the effects of a different malicious value passedto the query constructed and executed in Example 1. If an attacker withthe user name hacker enters the string 'name'); DELETE FROM items; --'for itemName, then the query becomes the following two queries:

Many database servers, including Microsoft® SQL Server 2000, allowmultiple SQL statements separated by semicolons to be executed at once.While this attack string results in an error in Oracle and otherdatabase servers that do not allow the batch-execution of statementsseparated by semicolons, in databases that do allow batch execution,this type of attack allows the attacker to execute arbitrary commandsagainst the database.

Notice the trailing pair of hyphens (--), which specifies to most database servers that the remainder of the statement is to be treated asa comment and not executed. In this case the comment character serves to remove the trailing single-quote left over from the modified query. In adatabase where comments are not allowed to be used in this way, the general attack could still be made effective using a trick similar tothe one shown in Example 1. If an attacker enters the string 'name'); DELETE FROM items; SELECT * FROM items WHERE 'a'='a', the followingthree valid statements will be created:

One traditional approach to preventing SQL injection attacks is tohandle them as an input validation problem and either accept onlycharacters from an allow list of safe values or identify and escape adeny list of potentially malicious values. An allow list can be a veryeffective means of enforcing strict input validation rules, butparameterized SQL statements require less maintenance and can offer moreguarantees with respect to security. As is almost always the case,deny listing is riddled with loopholes that make it ineffective atpreventing SQL injection attacks. For example, attackers can:

  • Target fields that are not quoted
  • Find ways to bypass the need for certain escaped meta-characters
  • Use stored procedures to hide the injected meta-characters

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Manually escaping characters in input to SQL queries can help, but itwill not make your application secure from SQL injection attacks.

Another solution commonly proposed for dealing with SQL injectionattacks is to use stored procedures. Although stored procedures preventsome types of SQL injection attacks, they fail to protect against manyothers. For example, the following PL/SQL procedure is vulnerable to thesame SQL injection attack shown in the first example.

Stored procedures typically help prevent SQL injection attacks bylimiting the types of statements that can be passed to their parameters.However, there are many ways around the limitations and many interestingstatements that can still be passed to stored procedures. Again, storedprocedures can prevent some exploits, but they will not make yourapplication secure against SQL injection attacks.

Related Attacks

References

  • SQL Injection Knowledge Base - A reference guide for MySQL, MSSQL and Oracle SQL Injection attacks.
  • GreenSQL Open Source SQL Injection Filter - An Open Source database firewall used to protect databases from SQL injection attacks.
  • An Introduction to SQL Injection Attacks for Oracle Developers
    • This also includes recommended defenses.