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06.12.2008 at 01:19PM PDT, ID: 23480958
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9.3

Cursor to Select

Asked by paemond in Miscellaneous Security, Databases Miscellaneous, MS SQL Server

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Hi,

I'm still fighting the SQL Injection Attacks.  I noticed that the attackers are using a cursor to select table names and columns from the sysobjects and syscolumns tables respectively.  Is there a way to have a cursor that gets the names of tables and columns and then selects from the tables and columns looking for '<scr' (which is what all the injections contain)?  

I know I can use something like Select Columname from Table WHERE PATINDEX('%<scr%', CONVERT(VARCHAR(4000), Columname))>0' to find the affected columns.  

What I want to end up with is a generic script I can run on any database that will give me the names of  tables and columns that might have been affected by an SQL Injection Attack. Is it do-able?

Thanks
Pierre
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The injections come in mostly as a long string of hex digits.  But, translating one of them I got...
 
DECLARE @T VARCHAR(255),@C VARCHAR(255) DECLARE Table_Cursor CURSOR FOR SELECT a.name,b.name FROM sysobjects a,syscolumns b WHERE a.id=b.id AND a.xtype='u' AND (b.xtype=99 OR b.xtype=35 OR b.xtype=231 OR b.xtype=167) OPEN Table_Cursor FETCH NEXT FROM Table_Cursor INTO @T,@C WHILE(@@FETCH_STATUS=0) BEGIN EXEC('UPDATE ['+@T+'] 
 
SET ['+@C+']=LEFT(CONVERT(VARCHAR(4000),['+@C+']),PATINDEX(''%<scr%'',CONVERT(VARCHAR(4000),['+@C+']))-1) WHERE PATINDEX(''%<scr%'',CONVERT(VARCHAR(4000),['+@C+']))>0') FETCH NEXT FROM Table_Cursor INTO @T,@C END CLOSE Table_Cursor DEALLOCATE Table_Cursor
[+][-]06.12.2008 at 04:08PM PDT, ID: 21774461

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Zones: Miscellaneous Security, Databases Miscellaneous, MS SQL Server
Tags: T-SQL (SQL Server 2000, SP4)
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Solution Provided By: mark_wills
Participating Experts: 1
Solution Grade: A
 
 
[+][-]06.12.2008 at 06:45PM PDT, ID: 21775152

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