SQL Injection
Jan 24, 2008
I haven't been able to get a clear-cut answer on this so I decided to ask here.
I have developed a web application that is used as a front-end to many SQL reports using report viewer.
The authentication on the front end uses a stored procedure to match the login name and password.
However, many of my reports do NOT use stored procedures. They are just standard text queries.
Is this secure? I don't know much about SQL Injection. Could an attacker see
all of the data in the database?
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Jul 4, 2006
This is my code:
CommandText = "SELECT * FROM Products"
If textboxStockID.Text.Length > 0 Then
CommandText = CommandText & " where [StockID] like '%" & textboxStockID.Text & "%'"
End If
Is this subject to the sql injection bug... if so, what changes do I need to make?
Canning
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Nov 25, 2007
What is the best way to avoid SQL injection?I know not to do stuff in Visual Basic such as...
Dim objCmd As New SqlCommand("SELECT * FROM mytable where id ='" & Request.QueryString("id") & '" , objConn)As it's best to use stored proceduresIs there any other problems you guys might have had happen to you or other possibilites for attackers that I should know about? Cheers
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Jun 5, 2008
I manage a VBSript/ASP/IIS/SQL website for a nonprofit, and our website has been hacked by SQL injections. I have changed the code on the website so it can't access the database, cleaned the database, backed up the database, but now need to find a way to tighten up the security so it won't happen again.
We're a non-profit- so the server is Windows 2000 Terminal SP4 (yeah, I know, it's old, bear with me).
I was using the following code to access the database from the website:
dbconn.open "DSN=cptigers;UID=sqlwebaccess;Password=password" (where cptigers is the name of the DSN connection with SQL server authentication).
So far, I've removed read permission in IIS on the include file that I use to open the database. I've changed the data source to use Windows NT authentication, and set the SQL login MDBCA/cptigers (this is the IIS login) to have public and db_denydatawriter roles.
But I'm not sure how to call this database connection in the code (how do you define the IIS user and password?), and not sure if this is sufficient to protect from future SQL injections.
Am I heading the right direction? Thanks, Amanda
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Jun 16, 2005
Hi All:I can't seem to get this thing work... When I type this in a textbox : '; exec master.dbo.sp_addsrvrolemember 'redice','sysadmin' -- , there's no respond, I mean, I check redice's role, but the System Administrators is not checked.Any idea about this?Thanks in advance.
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Jul 21, 2005
Hi All,
First explain the SQL Injection and how it working and second what is the Solution of SQL Injection..... ?
Thanx,
Shally
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Aug 14, 2004
Hi there !
Can anyone put some more lights on SQL Injection ? Is there anyway to get rid of it ? If yes then please let me know ?
With Thanks !
sqlboy
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Jan 30, 2006
Does anyone have any insight regarding SQL injection involving a table name t_jiaozhu? Is this a new hack script or old? I am having a hard time finding any clear details other than ways to stop injection from happening. This I know, what I am trying to figure out is what damaged may have been caused (worse case) and what would be a good plan of attack to figure out what steps suceeded/failed.
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Mar 25, 2008
I have a windows 2003 server with SQL Express 2005. The server has about 15 websites and uses ASP
Hackers somehow are creating NT Administrator Users on the server and then logging in with Terminal Services.
I ran thru SQL injection and tried to stop these attacks by stopping keywords in the SQL, but they still happen
Can anyone help, I really cant afford to pay for a security analyst so any advice would be nice.
How are these guys creating users?
thanks
Nick
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Mar 13, 2008
Hi there. I use MS Enterprise library to get access to my MSSQL database. All actions are performed by stored procedures. Should I check the input parameters for "bad" symbols such as ' or union words or the library do all this for me? Thanks.
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Nov 21, 2006
What is SQL Injection? Can any body explain it briefly?
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Jan 15, 2007
Am looking for SQL injection automation tool,can anybody suggest a tool which will be helpful.
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Jul 29, 2006
I want to inject a "where" criteria parametrically, but I can't get this to work:
CREATE PROCEDURE dbo.CopyTestCases
@Criteria varchar(255)
AS
declare @t table(NID int not null);
set transaction isolation level serializable;
begin tran;
insert into TestIT (Product,CatID,Category,Title)
output inserted.TestID into @t( NID)
select Product,CatID,Category,Title
from TestIT where @Criteria order by TestID;
commit;
GO
I get the message "An expression of non-boolean type specified in a context where a condition is expected". How do I fix this?
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Apr 9, 2008
A new take on my question from yesterday:
Does RS do any checks for SQL Injection attacks or is that entirely up to the developer?
i.e. if I have a report that uses dynamic SQL and pass in parameters via the web service are these parameters checked in any way?
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Jun 18, 2006
Hi, i have a big question about SQL injections,Im deploying a web site, and im using strore procedures, the store procedures recives the query parameters and then execute the query, that i already defined in them.I pass the store procedure´s name and their parameters via a sql statement adding the parameters to the string chain. The string chain is something like this: string sql = ("EXEC sp_StoreProcedure1 ' " + param1 + " ' + ' " paramN" ' )i define the store procedure´s name and the parameters in the string, and then i send the string to execute.My questions are,is there some kind of potential issue or attack that it can happens if i made the queries in this way?? is my database secure of sql injections just beacuse the use of store procedures???thanks for ur answers! ill appreciate them a lot
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Jun 28, 2006
Alright, so I have a basic search function to look through a field in my database which is decided by a query string. <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString %>"
SelectCommand="SELECT * FROM [Employee] WHERE ([Responsibilities] LIKE '%' + @Responsibilities + '%')"> <SelectParameters> <asp:QueryStringParameter Name="Responsibilities" QueryStringField="q" Type="String" /> </SelectParameters> </asp:SqlDataSource> But, I'd really like to fix it using parameterized SQL queries, so that people aren't dropping my tables. >_>I've been lookin' around for some code on how to do this in C#.NET, and most of them seem to look like this: SqlConnection objConnection = new SqlConnection(_ConnectionString);objConnection.Open();SqlCommand objCommand = new SqlCommand( "SELECT * FROM User WHERE Name = @Name AND Password = @Password", objConnection);objCommand.Parameters.Add("@Name", NameTextBox.Text);objCommand.Parameters.Add("@Password", PasswordTextBox.Text);SqlDataReader objReader = objCommand.ExecuteReader(); My problem is that I don't know how really know how to go from my code to this code... I mean, would I throw the latter in my backend code and call what it returns as a string, would I entirely replace my Datasource and do soemthin' with the code? Any help, in the form of tutorials or just straight up tellin' me here, would be greatly appreciated.Thanks. =D
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Nov 10, 2006
Hi everyone,it is the first time i try to do the sql injection. and i got the problem for the following code. Dim strSQL as String = ""Dim objConnection as New oleDBConnection(getConnectionString("image check list"))strSQL = " insert into tblTest (id, text) value ( 1, @Text)"cmdSelect.Parameters.Add(New SQLParameter("@Text", "abc"))Dim objDataAdapter As New oleDBDataAdapter(strSQL, objConnection)Dim objDS As New DataSet()objDataAdapter = NothingobjDS = Nothingthe exception said i have problem in "cmdSelect".i am using SQlServer as the data store.http://aspnet101.com/aspnet101/tutorials.aspx?id=1 => this is the reference site i read.Anyone can help?thanks a lot!
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Jan 21, 2007
I am building my first ASP.Net app from scratch and while working on the DAL I came across the problem of SQL Injection. I searched on the web and read different articles but I am still unsure about the answer. My question is should I add
db.AddInParameter(dbCommand, "AvatarImageID", DbType.Int32, avatarImageID);
Add in Parameters to my C# code to avoid SQL Injection. What is the best practice. I am unclear if the stored procedure already helps me avoid SQl Injection or if I need the add in parameters in the C# methods to make it work. I need some help. Thanks, Newbie
My C# update method in the DAL (still working on the code)
private static bool Update(AvatarImageInfo avatarImage)
{
//Invoke a SQL command and return true if the update was successful.
db.ExecuteNonQuery("syl_AvatarImageUpdate",
avatarImage.AvatarImageID,
avatarImage.DateAdded,
avatarImage.ImageName,
avatarImage.ImagePath,
avatarImage.IsApproved);
return true;
}
I am using stored procedures to access the data in the database.
My update stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[syl_AvatarImageUpdate]
@AvatarImageID int,
@DateAdded datetime,
@ImageName nvarchar(64),
@ImagePath nvarchar(64),
@IsApproved bit
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
UPDATE [syl_AvatarImages]
SET
[DateAdded] = @DateAdded,
[ImageName] = @ImageName,
[ImagePath] = @ImagePath,
[IsApproved] = @IsApproved
WHERE [AvatarImageID] = @AvatarImageID
RETURN
END TRY
BEGIN CATCH
--Execute LogError SP
EXECUTE [dbo].[syl_LogError];
--Being in a Catch Block indicates failure.
--Force RETURN to -1 for consistency (other return values are generated, such as -6).
RETURN -1
END CATCH
END
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May 1, 2007
Hello, Our Security specialist, is running an audit on one of my systems. All pages pass except the login page. It keeps saying I am getting hit with a SQL injection attack. I filter out special characters, both on the Client Side validation and the server side.It is only the one page I have is failing, and I am beginning to wonder if it is producing false positives.Protected Sub btnLogin_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnLogin.Click If Not Page.IsValid Then
lblError.Text = "Page Invalid"
Exit Sub End If Dim strMesage As String = ""
If Not IsInputSanitized(strMesage) Then
lblError.Text = strMesage
Exit Sub End If If Not ValueIsValid(txtUserName.Value.Trim) Then
lblError.Text = Globals.Message_InvalidCharacters
Exit Sub End If Public Function IsInputSanitized(ByRef p_strReturnMessage As String) As Boolean Dim loop1 As Integer Dim arr1() As String Dim coll As NameValueCollection Dim regexp As String = "^([^<>" & Chr(34) & "\%;)(&+]*)$"
Dim reg As Regex = New Regex(regexp) coll = Request.Form arr1 = coll.AllKeys 'Start at 1 so you will skip over the __VIEWSTATE
For loop1 = 0 To UBound(arr1) 'Skip over the ASPNET-generated controls as they will give a false positive.
If Left(coll.AllKeys(loop1), 2) <> "__" Then If Not reg.IsMatch(Request(arr1(loop1))) Then
p_strReturnMessage = Globals.Message_InvalidCharacters
Return False End If End If Next loop1 'If it never hit false retrun true
p_strReturnMessage = "Success"
Return True End Function If Not ValueIsValid(txtPassword.Value.Trim) Then
lblError.Text = Globals.Message_InvalidCharacters
Exit Sub End If If Not ValidateUser(txtUserName.Value.Trim, txtPassword.Value.Trim) Then
lblError.Text = Globals.Message_LoginInvalid
End If End Sub Here are the other validation routines 'This is a check to make sure that the String Values Entered into the Database field 'are indeed valid and without characters that can be used in injection attacks
Function ValueIsValid(ByVal p_Input As String) As Boolean Dim strIn As String = p_Input Dim x As Integer Dim A As String Dim l_Return As Boolean = True For x = 1 To Len(strIn) A = Mid(strIn, x, 1) 'Check each character in the string individually
If InStr("<>+%|?;()", A) <> 0 Then 'If this is not a "Bad" character
l_Return = False 'tack it onto the output string
End If Next Return l_Return End Function
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Jul 3, 2007
Hello,
I am building a website in ASP.net 2.0 and I want to protect my self from sql Injection.
I am half way there in that I have built my own class that I use to check any input to the Database from a textbox (or user input) for specific characters that cause trouble, such as the “ ‘ � or “;� it then converts them to my own code for example “ ’ � = |^| the same function will convert my “code� back to the original character which works great until I get to Gridviews and Forum View.
Does anyone know how I would access the class I created through the gridview and formview so that any info they display gets first translated through my class.
Or if that is not possible how I would set the grideview or formview to translate the “codes� for me.
If I am totally off track here and there is a much better way to do all this then I am all ears. Please keep in mind I will require the “bad� characters to be saved in some way shape or form.
Thanks
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Oct 25, 2007
I have become a big fan of the datasets in Visual Studio 2005. I usually create the SQL for each method in the table adapter; however, I am wondering if there is any 'built-in' functions in the C files for sql injection prevention? I have read that using stored procedures is a good method for prevention. Should I be using SP rather than SQL within my methods in the data table?
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Jan 2, 2008
One night over the last week someone successfully found a hole in a line of code in an ASP.NET website and was able to run an injection script against our database. I know, I know, stupid stupid stupid of us, but the breach was in an old app and an old database that we hadn't really taken a look at in a while, hence the one hole they found. This script from what I can tell was able to get a list of the databases on the server and attempted to iterate through all of them. The login they seized only had permissions for two db's so that's all they could access, but I'm still very scared about what they could have done with that login. I don't see any data loss, but they definitely dumped the contents of all tables, some of which contained some sensitive information. That information was encrypted but I'm not sure how much better that makes me feel.
So my questions
1) Since the user account they seized was the DBO on the database, what types of things might they have been able to do in the hour or so they were poking around other than run select statements. I know the account had update and delete permissions, although they didn't delete anything. My guess is they didn't want to tip us that they were in so they left the data intact.
2) How should we investigate the health of the DB and the server, to make sure they didn’t insert any scripts that are monitoring or reporting on data.
3) With DBO login access could they have messed with any system tables or settings?
4) Would DBO access allow them to read DB passwords? We’ve changed all of them already but I’m still concerned.
OK, so I’ll stop asking questions because obviously any help you can provide would be awesome.
Thanks so much.
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Jan 18, 2008
My website im working on lets ppl post stuff about them self and what not. How would guard against them from trying drop tables and what not
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May 8, 2008
Hi,
I need to find out what sql injection attack is, what it does how it is done and how to protect form it....Any through explanation will be much appreciated.
Thanks
Kabir
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Jun 5, 2006
Hi, I'm building a web application in which I want to prevent SQL injection. I'm using stored procedures, and using queries on my app like this:in my database...create proc createStudy@title varchar(200),@text textasinsert into studies values(@title,@text)goand in my web app...query="createStudy '"+titleBox.Text+"','"+textBox.Text+"'"; //title and text boxes are textboxes, createStudy is a stored procedure in my databaseodmccommand cmd = new odbccommand(query,con);con.Open();cmd.ExecuteNonQuery();But before this I do this code:if (titleBox.Text.Contains("Drop") || titleBox.Text.Contains("Delete")) messageLabel.Text="No permissions to do that";else(...my code)Is this ok to prevent SQL injection?!?
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Feb 6, 2005
Hi
What is a dynamic is SQL? can u give me a example.
What is a SQL Injection? can u give me a example.
Thinks in advance.
popskie
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Aug 18, 2006
hi,
Hope everybody is fine.Well,today I want to know the smartest ways to prevent sql injection attacks.It would be really helpful if anybody gives light to it.
Thanks!!
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May 21, 2008
Hello,
I apologize if this isn't the most appropriate place to ask but we have a SQL 2k server behind our website and we recently added a product review portion to our product pages. In the comments field in our db we are getting entries like:
1. Online Pharmacy, [url=http://w
2. iPb95U <a href="http://kmajvv (html tags are replaced in actual db)
My question is why the cut off? I just converted the code from escaped quotes and string concat to a stored proc using ADO params. The first entry was submitted with the sproc and the second while the string concat was still being used. So the visitor must be purposely truncating the entry, but I'm curious as to why. Is it just to try and break the code?
If anyone knows of better place to post questions like these, maybe a security forum, please let me know.
Thanks
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May 23, 2008
Hi friends, we have a website http://www.barneguiden.dk we have been constanly been attacked by virus. A malicious script enters into sql server database and stops the site.
can any one please suggest us how we can prevent it. I think it is going from our search field.Any help will be appriciated.
Thanks,
Umar Rahman
Suhanasoft
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Jan 21, 2007
I am building my first ASP.Net app from scratch and while working on the DAL I came across the problem of SQL Injection. I searched on the web and read different articles but I am still unsure about the answer. My question is should I add
db.AddInParameter(dbCommand, "AvatarImageID", DbType.Int32, avatarImageID);
Add in Parameters to my C# code to avoid SQL Injection. What is the best practice. I am unclear if the stored procedure already helps me avoid SQl Injection or if I need the add in parameters in the C# methods to make it work. I need some help. Thanks, Newbie
My C# update method in the DAL (still working on the code)
private static bool Update(AvatarImageInfo avatarImage)
{
//Invoke a SQL command and return true if the update was successful.
db.ExecuteNonQuery("syl_AvatarImageUpdate",
avatarImage.AvatarImageID,
avatarImage.DateAdded,
avatarImage.ImageName,
avatarImage.ImagePath,
avatarImage.IsApproved);
return true;
}
I am using stored procedures to access the data in the database.
My update stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[syl_AvatarImageUpdate]
@AvatarImageIDint,
@DateAddeddatetime,
@ImageNamenvarchar(64),
@ImagePathnvarchar(64),
@IsApprovedbit
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
UPDATE[syl_AvatarImages]
SET
[DateAdded]= @DateAdded,
[ImageName]= @ImageName,
[ImagePath]= @ImagePath,
[IsApproved]= @IsApproved
WHERE[AvatarImageID] = @AvatarImageID
RETURN
END TRY
BEGIN CATCH
--Execute LogError SP
EXECUTE [dbo].[syl_LogError];
--Being in a Catch Block indicates failure.
--Force RETURN to -1 for consistency (other return values are generated, such as -6).
RETURN -1
END CATCH
END
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Jan 15, 2008
Hi all, long time lurker, first time poster.
One of those fantastic mornings, an hour late, no coffee, walk through the door and the first words I hear are "we've been hacked!"
Ugh.
Turns out there is one and only one place on the website that isn't properly protected against sql injection attacks and somebody found it (now fixed). It doesn't look bad - a new table has been added, dbo.a_LyHungTraVinh_a with two empty columns [LyHungTraVinh VNC Hacked] and [Good Bye My Love]. I was somehow hoping my first hack would be more clever, so I'm also having to cope with mild disillusionment.
But I think I can get over that, what I'm really hoping for your help with is how to proceed with the forensics and clean-up. See, our DBA resigned a couple weeks ago and we're in the cute situation of not having one at this moment - I'm certainly not one. It looks like this is just a random act of harmless vandalism but I'd feel better if we did our full due diligence. Here's what we've done so far, any additional advice or links to resources would be greatly appreciated.
1. Identified and closed the vulnerability
2. Ran AdeptSQL_Diff and compared the production db with an archived version - other than the aforementioned new table, the schema and data is unchanged
3. ... that's it.
I suspect using DBCC LOG and/or fn_dblog would be helpful to review the attacker's transactions, but I'm having a devil of a time finding information on how to use those, particularly about what permissions I need to use them.
thanks!
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Jul 23, 2005
All,I am trying to test an attack against a web page. The VBScript runs 2queries against the database; the first must succeed before the secondruns. Here is the code:1st-select * from users where (userid=' + @string + ') and password=' +@pwdstring + '2nd-select * from permissions where userid=' + @string + 'When attempting the attack the problem lies in the "(" & ")"surrounding the first userid string in the 1st query. if I attempt toput a ")" in the original @string function to cancel out the first "("it then causes problems for the second string. Also, the @pwdstringgets encrypted before it is sent to the SQL Server, so attempting theattack from that field is useless.For instance:@string = ' or 1=1)--@pwdstring = blank (becomes @pwdstring = 55-12-567-3244-123 due toencryption)select * from users where (userid='' or 1=1)--') andpassword='55-12-567-3244-123' WORKS OKselect * from permissions where userid='' or 1=1)--' DOES NOT WORKIs this an instance where the original developers made a happy codingerror (I asked and preventing injection attacks wasn't intended) or isthere something I can do to circumvent this?Thanks,josh
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Nov 6, 2006
I am taking a class where the professor really dislikes using parameterized queries because he considers them to be pointless. Despite the many points that I and a classmate bring up, the only thing he considers valid is using them to prevent SQL injection attacks. To prevent this, he replaces all single quotes with a pair of single quotes. I know this works for SQL server, but will fail in some others (for instance MySQL also allows '). Is there other possibilies such as the ' that need to be protected against?
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