Securing A Remote Server
Sep 27, 2007
I have what some might consider a dumb question but I really don't know the answer.
Until recently all our .Net work ahs been hosted on our internal network and the Sql Server (2000) was not open to the outside. However recently our company is looking at hosting other outside SQL Server applications that require users across the country to connect directly to our SQL Server (not through an ASP.Net app).
The concerns we have is that ASP.Net runs on the NETWORK SERVICE account. If a user outside our network were to know the IP and name of onw of our databases could they connect with ASP.Net using a Trusted Connection or do trusted connections only work if the application is hosted on the same network?
One of the applications we are looking at hosting is showing a list of all databases on our server (I did find the article on modifying sp_MSdbuseraccess but that didn't seem to work) so if someone got a hold of this list would they be able to connect?
Thanks
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Dec 5, 2006
Hi,
I'm without a clue when it comes to SQL and how to secure it!
I've set up a SQLExpress running on a dedicated server on the web and I'm using TCP/IP remote connection to connect to the DB from a the web server running the ASP .
Would it be better using named pipes?
Also is there some way I can additionally authenticate a connection based on IP numbers?
I would really appreciate some advice thanks.
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Jun 7, 2006
Rayd Abdou writes "hi all, i have an SQL server at my home and i think i got hacked from it :( and i really want to know what to do to secure the SQL Server from, disable permissions ?
what commands ?
Thanks for helping me..
Rayd."
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Apr 18, 2007
Hi all,
I have been given a task of securing an SQL server 2005 that is currently open to SQL injection attacks. I have identified 3 main areas that I need to secure, these being:
1.Different SQL server logins - currently all database work from the site is performed using the sa account (don't ask me why they've left it so open to attack, I've not long started here!)
2.Custom error pages - to reduce feedback to a potential attacker on the database structure
3.Query Validation - any dynamically generated queries will be passed through a validator in order to possibly strip out any commands that we identify as those that an attacker would attempt to pass via the url.
Obviously, point number one is the big one. Based on this, my question is, what are the series of steps I would need to go through in order to;
a) setup a user login that has read access to many of the database tables (and execute access to some of them)
b) setup a user login that has read/write/update/execute access to other tables and stored procedures
I have read a lot about schema's, but I haven't had that many dealings with SQL server 2005 (yet), and haven't been able to find a step-by-step guide to setting up a schema/users and assigning permissions to them.
If someone could point me in the right direction of an "idiots guide to", that would be great, or if theres anyone that could list the steps I need to perform, that would be even better.
Also, if anyone has any other suggestions about how i could secure the server, I am all ears.
Thanks in advance,
Paul
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Mar 18, 2008
Hi all,
What is the best way to keep the data secure in my SQL Server 2005? and what is the best way to secure the communication between the client application and SQL Server 2005?
Thanks,
Shyam
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Mar 9, 1999
Hi all,
Does anyone know were to find any articles/information on how to Secure Microsoft SQL 6.5 Server? . Apart from SQL online books
Panchal
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Feb 20, 2005
I want to know how I can protect my SQL Server database. SQL Server 2000 does not have Database Encryption feature and using only Authentication is not a fool-proof solution, as far as stand-alone desktop application is concerned.
Does password protection of SQL Server 2000 database really works when you have all types of cracking tools widely available on the net?
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Mar 31, 2008
Hi,
How can we restrict the copying of MDF and Log Files.
Thanks
Avi
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Mar 19, 2008
Hello,
I developed a small desktop system using SQL Server 2005 Express as the data backend. The machine that hosts SQL Server 2005 Express, as well as all the workstations that interact with it, belong to the same private LAN segment. All of them have non-public IP addresses from class 192.168.0... which means they're not directly visible from the outside world, despite having internet access through a router that does NAT. As we all know this is the typical scenario for sharing internet access in a small LAN.
Now, my concern is with the security of the host running SQL Server 2005 Express. In particular, what measures do I have to implement to minimize the risk that may come from the public internet ? It's naive to think that because the potential attack surface is NATted behind a router, security is guaranteed and data theft or DoS attacks won't simply happen.
What are the guidelines for securing SQL Server 2005 Express in a scenario like this ?
(Side note: SQL Server 2005 Express is running on Windows XP Pro)
Thanks.
Fernando
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Jun 7, 2000
Hello,
We are currently live with a CRM solution (Siebel) that uses SQL Server 6.5 as the back end. All is fine and dandy, except I have some reservations about security.
Quite simply, it is possible for anyone to open up MS Access and link to any of the SQL Server database tables via the ODBC DSN used by the Siebel front end. This DSN is necessary for Siebel to function.
I am bit worried that someone (out of incompetence or spite) might do just that and cause some serious damage. Its probably technically beyond the large proportion of our users (especially those that could make mistakes!), but I can't get the nagging fear out of my head.
Does anyone know of anyway to combat this problem? I have scoured the web, including this site, and cant seem to get any information on this.
Thanks and Regards
Dike
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Oct 4, 2007
Hello.
Not an SQL admin. We have an SQL 2005 server that has about 5 DB's on it. One database is maintained primarily by a third party. Often when they need to do upgrades they login remotely to the desktop of our SQL server. Is there a way to apply permissions to specific databases like you would for NTFS? That way they can only backup their database and not do anything to any other databases? Thanks.
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Apr 27, 2006
Hello!
I developed database driven .NET application and I need to deploy it. I faced a problem, which is "how to protect my database against direct access". I use MS SQL Server 2005 Express Edition as a DBMS and appropriate database.
I want to make possible to manipulate with data in my database only through my client application.
1. How do I define SA password and instance name in silent mode of MS SQL 2005 EE installation with Mixed type of Authentication?
1.1. Can I change SA password after the installation?
2. If my database be attached to my new instance... Is it possible to copy my database, attach it to another instance and get a direct access to its objects?
Is there solution that make impossible to connect to my database on third-partie's side Idirectly, without using the client application?
I appriciate for a help.
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Jun 2, 2015
- When I disable "allow remote connections to this server" from server properties>connection page, I can still remotely connect to the server from SSMS...so what is the impact of enable/disabling it?
- what is the impact of changing the remote query timeout (on the same page) from default value?
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Dec 11, 2007
Hi, I am using ASP.Net 2005 with C# language and SQL SERVER 2005...
I am developing an web based application and have to deploy it on server.
I need to prevent my site from the SQL Injection and have to use some algorithms.
What is the best technique or method (Algorithm) in .Net ?
Give some measures to prevent from Hackers.
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Jun 23, 2005
We are looking for a way to tightly secure the database of a product
being developed in MSDE 2k & C# so that even the db design
cannot be viewed or data retrieved through any migration tools.
The NetLib database security tool perfectly matches our requirement but
is overpriced. Any suggestions on the next best alternative?
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Jan 16, 2001
Hi All,
I am currently creating a SQLServer 7 server. This server will be used to host customer databases that I will restore on to the server. However, I want to prevent these customers accessing any other databases on the server, apart from their own. By removing the public database role from each customer database, and granting them very limited rights (basically exec rights on their own Stored Procs)on their own db, I plan to limit them to their own db. However, my problem is this:
As you cannot remove the public role from the master db, a user could easily exec the following in a stored proc to read from the master:
Select * from master..sysusers
How do I prevent the users from accessing the master in this fashion.
Will removing every permission from the public role in master be enough?
Will removing every permission from the public role in master have any other side effects?
Will removing the public role from other user dbs be enough to secure them?
Any suggestions/pointers would be appreciated.
Gary.
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May 8, 2007
Morning Guys,
I'm trying to figure out a way of securing a DTS package and understanding how it works more and more.
I have system administrators that have accesss to sql server.
As dbas here we work with dts packages. We would like our packages secured from the system administrators that want to poke around with our work.
how would we lock our objects down without messing them up from executing.
The packages have been created under the servernameAdministrator.
servernameAdministrator is the owner of the package.
What would be the best way to start to understand all this.
1). Using an owner password a user password
2). Denying access to the sp_add_dtspackage & sp_get_dtspackages...
3). When generating a DTS RUN util to make a job using the dts package
usually the password is embedded in the string even after encrypting the pacakage in clear text....
any suggestions to lead me in the right direction......
jonathan
If you have an owner password with no user password, you cannot execute the package without the owner password. Click OK to continue saving.
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Jul 31, 2007
Dear All,
I have developed a application using SQL express.
One of my client wats to protect his database so that if some body takes the backup he/she is not able to view data either directly or from the application i am delivering (may be he can buy my software and use his database or simply use demo version of my data)
Previously I used Access database and use database password protection (which every body knows is not good enough).
Now what I should do to protect my database (I am not worried about database structure or other objects but clients data that he will enter into the software like accounts data)
I need a moderate and a hard solution so that depending upon clients ability to affort I can implement at client side. There is no need to deliver protection in distrbution of my software.
Thanks in advance
MANOJ JAIN
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Jul 20, 2005
can we secure mdf file, if it's copied from one location to anothercould not be used ???*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Jul 23, 2005
I have a situation where I have an app that uses a sql server (msde)database. The app will be used in environments where no one should beable to manipulate the data except the developers (app admins) - noteven site database admins. When the application and msde is installed,a default instance of the database gets attached to msde or built byscript. by default, a built in server acct and approle acct exist tosecure the data accordingly with passwords concealed. What can be doneto keep someone from copying the mdf and ldf files to another machinewhere they have admin rights and manipulating data?Thanks.
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Feb 18, 2008
Hi,
I want to make some steps towards securing production database.
1. Give limited rights to Developers, i.e. db reaonly, db writedeny
2. Make strong password for local and Domain
3. Use Windows authentication
4. Enable log for 'Failed Login' attempts.
What steps I need to take in addition to those?
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May 7, 2008
Hi,
I€™m trying to secure my SQL Server 2005 infrastructure, and I€™m seeing that some sites are recommending that certain extended procedures be restricted to sysadmin only.
http://www.sqlsecurity.com/FAQs/SQLSecurityChecklist/tabid/57/Default.aspx
This site recommended securing the following extended procedures:
Extended Procedurs:sp_sdidebug xp_availablemedia xp_cmdshell
xp_deletemail xp_dirtree xp_dropwebtask
xp_dsninfo xp_enumdsn xp_enumerrorlogs
xp_enumgroups xp_enumqueuedtasks xp_eventlog
xp_findnextmsg xp_fixeddrives xp_getfiledetails
xp_getnetname xp_grantlogin xp_logevent
xp_loginconfig xp_logininfo xp_makewebtask
xp_msver xp_perfend xp_perfmonitor
xp_perfsample xp_perfstart xp_readerrorlog
xp_readmail xp_regread xp_revokelogin
xp_runweb
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=3184075&SiteID=1
This thread recommended (implicitly) securing the following extended procedures:
Extended Procedures:sp_OACreate sp_OADestroy sp_OAGetErrorInfo sp_OAGetProperty
sp_OAMethod sp_OASetProperty sp_OAStop sp_sdidebug
xp_availablemedia xp_cmdshell xp_deletemail xp_dirtree
xp_dropwebtask xp_dsninfo xp_enumdsn xp_enumerrorlogs
xp_enumgroups xp_enumqueuedtasks xp_eventlog xp_findnextmsg
xp_fixeddrives xp_getfiledetails xp_getnetname xp_grantlogin
xp_logevent xp_loginconfig xp_logininfo xp_regread
xp_perfend xp_perfmonitor xp_perfsample xp_perfstart
xp_readerrorlog xp_readmail xp_revokelogin xp_runwebtask
xp_schedulersignal xp_sendmail xp_servicecontrol xp_snmp_getstate
xp_snmp_raisetrap xp_sprintf xp_sqlinventory xp_sqlregister
xp_sqltrace xp_sscanf xp_startmail xp_stopmail
xp_subdirs xp_unc_to_drive xp_dirtree
Looking at these lists, I can see they might have missed other extended procedures like xp_regwrite, xp_regdeletekey, and xp_regdeletevalue.
My questions are: Is there any way I can find an exhaustive list as to what extended procedures should be restricted? Is there a website/Microsoft resource that can help me identify what to restrict?
Any other information you can point me to to secure our infrastructure would be appreciated.
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Jan 22, 2006
Hye guys,
I am not the perfect database designer nor the programmer. I have designed and developed a simple database application which uses VB as frontedt and SQL as backend. My Program worked fine.. Now I have 2 deploy it in clients computer where DBA is another person by which I am worried abt the data in the table. As X person is a DBA there he can easily change data of my tables in the database.
So I want an easy way by which the X person can't edit the data of the tables of my database only I can change the contents of my tables but i should be able 2 change the data from my program only..
Plz Help..
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May 18, 2008
Hey all,
Trying to add some security to what I'm learning I realized my querystring was vulnerable so I started looking through the threads on how to secure it. I've seen a few things, but in general the folks working on it are too advanced for me and are doing more with their query than my simple query. I'm looking for a little help of course :-)
So, my original querystring was pretty basic of course
Dim querystring1 As String = Request.QueryString("topic_id")SqlDataSource1.SelectCommand = "select * from msg_msgs INNER JOIN users on msg_id_user = users.user_ID where msg_topic_id = " & querystring1
And my first attempt at securing it didn't wind up having the @ sign, so I don't think it secured it. It also brought back every record in the DB
Dim querystring1 As Parameter = New Parameter("mylink", TypeCode.String, Request.QueryString("topic_id"))SqlDataSource1.SelectParameters.Add(querystring1)
And finally, after reading a bit I wound up with this
Dim queryStringId As String = Request.QueryString("topic_id")Dim id As IntegerIf Int32.TryParse(queryStringId, id) = True Then Dim idParam As New SqlParameter("@id", id) Dim objCmd As New SqlCommand("SELECT * FROM msg_msgs where msg_topic_id = @id") objCmd.Parameters.Add(idParam) SqlDataSource1.SelectCommand = (objCmd.ToString)Else Response.Redirect("./threads.aspx")End If
I guess the worst part is that I know I need the @variable piece, though not why nor how to add it, and all my searches on parameterized queries are loosing me because the folks writting are so far beyond where I am at this time. I would really appreciate it if someone could not only help me get the code working, but also understand the parts of it. More often than not I find myself mimicking someone elses code and then knowing how to do it, but not why it works. Thanks
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Jul 23, 2005
Hi,I am writing an application that uses MSDE to store data.Both application & MSDE run on the same computer.I want to regulate the operations done on the DB by the user. Forexample, I don't want to allow "standard" users to delete records,update certain fields, etc...I can regulate these rules within my program, but what if the user runsMSDE query for example on the DB and fetches the list of users &passwords from the DB ?In other words, I need to make sure only the application has access tothe DB. This seems like a common type of problem but I haven't beenable to find any solutions.Any suggestions would be greatly appreciated.Danny
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Nov 1, 2007
Hi all ,
There is a table named "Users" in my SQL Server DB , there is password field that I'm going to make it secure , Now I explain you How I plan to this :
There are two columns named "SID1" & "SID2" other than "Password" Field in this table and their datatype are all VarBinary ,
When I want to add user to this table , two random byte arrays are generated using RNGCryptoServiceProvider Class , then I combine SID1,SID2 and Password byte arrays to generate password , after that this byte array is Hashed using
SHA384 Class and is stored into database , Also two randomly generated byte arrays are stored in SID1 & SID2 Fields , For Comparison , I do all above steps reversely , Up to here there is no problem and everything work OK , but I have two questions ,
1) Is this way of storing password secure?
2)Isn't it better to put these codes into a CLR Integrated Class and do all above steps in SQL-Server-Side?If Yes , I should send my clear-text password to sql server For Hashing and Validating and this password could be stolen using a packet sniffer , What Should I do in this Step? Installing SSL?but I'm in a workgroup environment , How can I Install SSL in workgroup environment? Isn't there any other solution?
Thanks in advance for your great helps ,
Cheers
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Nov 10, 2006
I am trying to add a linked server from a AMD x64 server (Windows 2003) with SQL Server 2005 64 bit to a Server running SQL 2000. These are not in the same domain.
I can create a linked server using the option "Be made using the login's current security context" but can not when trying to specify the security context, i.e. sa and the sa password. When I try I get the following message:
Msg 15185, Level 16, State 1, Procedure sp_addlinkedsrvlogin, Line 98
There is no remote user 'sa' mapped to local user '(null)' from the remote server 'DTS_FSERVER'.
I have several other x64 server that I have no problem creating a linked server and specifying sa and the sa password.
The problem with using "the login's current security context" option is that I get an error when trying to run any Jobs against the linked server. The job fails withe the following error:
Executed as user: NT AUTHORITYSYSTEM. Access to the remote server is denied because no login-mapping exists. [SQLSTATE 42000] (Error 7416). The step failed.
I'm sure the two errors are related. Any ideas what is going on?
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Jul 14, 2005
Numerous articles (e.g., http://www.microsoft.com/sql/techinfo/administration/2000/security/securingsqlserver.asp, even one that I wrote, http://www.dbazine.com/sql/sql-articles/cook12) state that to secure SQL Server, the SQL Server services should not run as Local System. That advice is useful only if making the change is not overly disruptive or is even allowable. My two most recent clients have absolutely rigid password expiration policies that require all account passwords to be changed at regular intervals. Realistically, that makes a compelling case for running as Local System.
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Jul 29, 2005
I'm chasing after a documetn that was available on one of the Microsoftwebsites that was titled somethign like "MS SQL Server Best Practices"and detailed a nyumber of best practices about securing the server.Included in this was revoking public access to the system tableobjects.Can someone post the URL where I can pick this up, or drop me a note oncontacting them for a copy of the document?
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Aug 23, 2006
Fellow Devs,
I have an instance of SQL Server Express 2005 running on another box and I have Remote Connections enabled over both TCP/IP and Named Pipes, but on my other box I keep getting the error that the server does not accept Remote Connections.
Any ideas why this might be happening? Is there some other configuration?
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Jan 4, 2013
if you can restore a database to Server B using Server A as the service. Meaning we would issue the command on Server A but somehow point to Server B as where we want the restore to happen.
The backup file would be in a location independent of both servers.
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Jan 22, 2008
My site works fine in VWD2008 express, but I get this error when I try to use it on my live website.
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
According to this article: http://support.microsoft.com/kb/914277 I am supposed to:
1.
Click Start, point to Programs, point to Microsoft SQL Server 2005, point to Configuration Tools, and then click SQL Server Surface Area Configuration.
Ok, there is no such program in this folder. The only thing in there is "SQL Server Error and Usage Reporting"...
The other thing I am greatly concerned with is this: All is want is for my webpages to be able to access my database for user authentication. I DO NOT want to grant the internet rights to remote connect to my database.
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Jul 22, 2007
i did "Linked server" between To Servers , and it's Working.
---------------------------
For Example :
Server 1 =S1.
Server = S2.
i create table in S1 : name = TblS1
i create same table in S2 : name TblS2
and i create trigger(name tr_cpD) From S1 in TblS1 For send data To TblS2 in S2
/****************** trigger Code ***************
CREATE TRIGGER dbo.tr_cpD
ON dbo.TblS1
AFTER INSERT
AS
BEGIN
SET NOCOUNT ON;
insert into [S2].[dbname].[dbo].[TblS2] Select ID,Name from insertedEND
**************************************************
result is :
Msg 7399, Level 16, State 1, Procedure tr_cpD, Line 14
The OLE DB provider "SQLNCLI" for linked server "S2" reported an error. The provider did not give any information about the error.
Msg 7312, Level 16, State 1, Procedure tr_cpD, Line 14
Invalid use of schema or catalog for OLE DB provider "SQLNCLI" for linked server "S2". A four-part name was supplied, but the provider does not expose the necessary interfaces to use a catalog or schema.
how i can execute this trigger
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