0xword hacking de aplicaciones web - sql injection, v2.pdf. Home; 0xword hacking de aplicaciones web - sql injection, v2.pdf. SQL injection, also known as SQLI, is a common attack vector that uses malicious SQL code for backend database manipulation to access information that was not intended to be displayed. This information may include any number of items, including sensitive company data, user lists or private customer. Advanced SQL Injection Presented By: Joe McCray joe@learnsecurityonline.com. I used to think Web App Security was stupid sh*t “This stuff isn't hacking'. Blind SQL Injection Syntax for extracting the USER. With MySQL you really only have: * Union-Based * Blind Let’s move on to MySQL syntax. Hack Proof Your ASP.NET Applications From SQL Injection. Generally attacker inject the sql Injection directly from the web page or by manipulating sql statements. Hack proof your asp.net applications from Session Hijacking. Preventing SQL Injection Attack ASP.NET - Part I. Acunetix web Vulnerability Scanner has a similar SQL injection tool built in as well. If your budget is limited, you may consider using a free SQL injection tool such as SQL Power Injector or the Firefox Add-on, SQL Inject Me.

7 Jun 2013CPOL

This article descirbes what SQL injection is and how to prevent from SQL injection.

Hacking de Aplicaciones Web: SQL Injection. Atacar una base de datos, muchos pensamos en el or 1=1 y “pa dentro”. En ocasiones no se logra el resultado esperado, sin saber muy bien porque.

Introduction

A developer never wants to get hacked his own web application .But intruder , malicious persons are more than developers, and I used to be one of them and then turned into a developer .As i have walk in both the shoes , so i have decided to write a series of articles which will definitely help to hack proofing a web application .

A developer should always concerned about hack attempts in their applications ,and its a developer duty as well. Lots of online tools, spoofing tools, sniffers tool, etc., are available on the internet .so even a normal internet user can turned into a hacker . i hope everybody knows the consequences of being hacked , so by not describing them , i better do write my article.

lets gets start understanding of some hacks and how a developer can prevent them .in this first article i will start by sql injections.

SQL Injection

SQL injection is an attack in which one or more commands are inserted into a query to form a danger query which may retrieve , damage , manipulate your existed data channel. This almost always occurs when dynamic SQL is being used and when you’re concatenating strings in your code (C#,VB,J#,F#) to form SQL statements. SQL injection can occur in your Microsoft .NET Framework code if you’re forming a query or procedure call, and it can occur in your server-side T-SQL code as well, such as in the case of dynamic SQL in stored procedures.

SQL injection was number one attack in 2010 .And legacy coded applications are still vulnerable to sql injections. let me describe it more clearly or we can say in simple language , it happens when commands(or other sql queries) are inserted where we were supposed to send the DATA into sql .We can divide a whole query into two channel control channel (query) and data channel (user inputs). A attacker usually do not care about your control channel (query) , he just do care ,how he can insert malicious query in your data channel.

There are other ways too to inject sql injection : -

• String truncations from SQL functions
• Automated tools

Except being hijacked of any individual or group accounts , sql injection can help to do virtually anything on the system that permissions allow : -

• Install backdoors
• Can copy database over port 80
• Port scan (can scan your whole network)
• Many more !!

How is it Exploited -

Generally attacker inject the sql Injection directly from the web page or by manipulating sql statements .

In the above code we are concatenating the string with user input data and forming a sql statement .and we supposed to work our query like in the following image -

But a hacker thinks differently , he will manipulate the query as in the following image -

SQL Injection Used in the above example -

Above is just a example, there are many sql injections which a hacker can try on a application.Hacker can get the passwords , install the backdoor . hacker can manipulate the query to get the data from sysobject for all the database detail .

How to prevent SQL Injections -

1. Validate user input (Using Regex or anything else)
2. Using Parameterized query
3. Use Stored procedure
4. Use an ORM

1.Validate user input

The simplest way is that we can validate the user input using Regular Expression and replace the danger character by blank

But but this is not the best way to prevent application from sql injection .Because SQL Injection does not only contains '-' or ' ' ' . There are many sql injections which consists legal code too.

2.Using Parameterized Query -

if we want to use inline SQL ,then to stop SQL injection we can pass the parameter in sql query and can add SQL Parameter in the query .this way we can prevent sql injection .there is nothing wrong in using sql statement inline.

parameterized query tell to the SQL server that data passed into any parameter will remain in the data channel thats how sql server prevent the SQL injection. But still its not the best way as we are writing business logic inline .every time i have to write again this query .

3.Using SQL Procedure -

https://foundryomg.netlify.app/telecharger-logiciel-de-piratage-wifi-gratuit-a-paris.html. The best way to prevent from SQL injection is use stored procedure . As business logic are hidden , Its provide better performance , reusability . Now you will have to just protect the table and stored procedure by using permissions .

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4.Use an ORM -

We can use any ORM (Entity framework , Nhibernate ,etc ) .ORM makes query parameterized behind the scene so using ORM we can also prevent SQL Injection.

References

Code-injection attacks manipulate specific system variables. This gives hackers the opportunity to access that sensitive information that they just love. Hackers can use this information to determine more about the web application and its inner workings, which can ultimately lead to a serious system compromise. Here’s an example:

Attackers who see this variable can start entering different data into the info_variable field, changing X to something like one of the following lines:

The web application might respond in a way that gives attackers more information than they want, such as detailed errors or access into data fields they’re not authorized to access. The invalid input might also cause the application or the server to hang. Hackers can use this information to determine more about the web application and its inner workings, which can ultimately lead to a serious system compromise.

If HTTP variables are passed in the URL and are easily accessible, it’s only a matter of time before someone exploits your web application.

Code injection can also be carried out against back-end SQL databases — an attack known as SQL injection. Malicious attackers insert SQL statements, such as CONNECT, SELECT, and UNION, into URL requests to attempt to connect and extract information from the SQL database that the web application interacts with. SQL injection is made possible by applications not properly validating input combined with informative errors returned from database servers and web servers.

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Two general types of SQL injection are standard (also called error-based) and blind. Error-based SQL injection is exploited based on error messages returned from the application when invalid information is input into the system. Blind SQL injection happens when error messages are disabled, requiring the hacker or automated tool to guess what the database is returning and how it’s responding to injection attacks.

There’s a quick, fairly reliable way to determine whether your web application is vulnerable to SQL injection. Simply enter a single apostrophe (’) in your web form fields or at the end of the URL. If a SQL error is returned, odds are good that SQL injection is present.

You’re definitely going to get what you pay for when it comes to scanning for and uncovering SQL injection with a web vulnerability scanner. As with URL manipulation, you’re much better off running a web vulnerability scanner to check for SQL injection.

When you discover SQL injection vulnerabilities, you might be inclined to stop there. You could keep digging. An excellent — and amazingly simple — tool to use for this is SQL Injector, which comes with webInspect. You simply provide the tool with the suspect URL that your scanner discovered, and the SQL injection process begins.

You can click the Get Data or Pump Data buttons in SQL Injector to start dumping information, leading you to the ultimate ethical hacking goal.

Acunetix web Vulnerability Scanner has a similar SQL injection tool built in as well.

Hacking De Aplicaciones Web Sql Injection Pdf Gratis

If your budget is limited, you may consider using a free SQL injection tool such as SQL Power Injector or the Firefox Add-on, SQL Inject Me.

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