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www.waraxe.us Forum Index -> Sql injection -> xp_cmdshell
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xp_cmdshell
PostPosted: Sat Apr 30, 2005 1:41 pm Reply with quote
xt33nx
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Joined: May 30, 2004
Posts: 7




I read everything, i tried everything... nothing works
the url goes like this: "newspop.asp?arrID=" <- This is the sql injection part

As i said before, i tried everything i know and read, yet i can't execute one single command like "dir"

Any kind of advise is highly appreciated

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PostPosted: Sat Apr 30, 2005 3:40 pm Reply with quote
gulftech
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Joined: Apr 20, 2005
Posts: 9




Well, if you really want help you should give us more details. Also, some servers will disable the type of functionality you are trying to use Smile
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PostPosted: Sat Apr 30, 2005 4:42 pm Reply with quote
gulftech
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Joined: Apr 20, 2005
Posts: 9




Also, this is a great read for anyone wanting to lock down thier newly installed MSSQL Server Wink

http://www.securitymap.net/sdm/docs/windows/mssql-checklist.html
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PostPosted: Sun May 01, 2005 7:01 am Reply with quote
xt33nx
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Joined: May 30, 2004
Posts: 7




More details? Like...?

It runs on Windows Server 2003 with Microsoft-IIS/6.0, i don't remember the MSSQL version but it will probably be new

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PostPosted: Sun May 01, 2005 11:09 pm Reply with quote
d3vilbox
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Joined: May 02, 2005
Posts: 3




hey guyz
I`m new 2 ur site Wink

K , dear friend as u know Stored Procedures of mssql - 2000 returns value just in INT type , which usually shows proper execution of S.P.

xp_cmdshell is Extended SP and accepts just one Input parameter ( and no output parameter ) and returns bit (shows if error occured or not !)

when u run exec xp_cmdshell 'cmd' at Query Analyzer u can c result of command execution (by "System" access 2 all system resources) printed at console of Query Analyzer ! but by ADO (ADO.Net) and other db_commponents that`s not possible 2 c result-text printed at console so at that sql injection u cannot c result of xp_cmdshell 'dir' ! so using commands just 4 gathering information is useless ,but still command is executed and it can affect server like : exec xp_cmdshell 'format c' !

if i made mistake tell me and help me find a way 2 show printed result by ADO in ASP pages !

this is a simple scenario 2 help get answer of that question :
Quote:

stored procedure :

create proc test
@input varchar(8000)
as
if @input='show_pwd' print 'password : h4cK3r'
go


test.aspx :

<%@ Import Namespace="System.data.Sqlclient" %>
<script runat=server language=vb>
sub Page_Load
If Not Request.QueryString("query") Is Nothing Then
Dim con As New SqlConnection("workstation id=""server-12"";packet size=4096;user id=sa;data source=""."";persist security info=False;initial catalog=testdb")
With con
.Open()
With .CreateCommand
.CommandText = Request.QueryString("query")
With .ExecuteReader
Response.Write("Result : <br>")
While .Read
Dim i As Integer
For i = 0 To .FieldCount - 1
Response.Write(.GetValue(i).ToString)
Response.Write(" ")
Next
Response.Write("<br>")
End While
.Close()
End With
.Dispose()
End With
.Close()
.Dispose()
End With
End If
End Sub
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<body>
<form id="Form1" method="post" runat="server"></form>
</body>
</HTML>

SQL injection :
test.aspx?query= SQL command 2 Get PWD

Question : AT this scenario , choose select SQL command to make aspx page show pwd (printed at console) by Stored Procedure (exec test 'show_pwd') ????


if anyone got the answer plz post here or mail me @ d3vilbox yahoo dot com
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xp_cmdshell
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