SQL Injection And Preventing Querystring Abuse
My client received an email from a user who mentioned that by accident they had been typing (over the querystring I guess), and the url had become:
default.asp?pageid='asd
They then received a SQL Server error message.
My client contacted their webhost, who came back to them promptly and talked of 'SQL Injection', they said that we would need to secure the code as well as the permissions on the database(which I believe they have done)..
This is something I had over looked, and started to write a fix for a couple of nights ago...but I dont think its 100%....
Basically I now do this at the top of my default.asp page ...
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I just wanted to share it with you guys and ask your opinions. Code:
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I've seen plenty of articles and utilities for preventing form injections for ASP.NET, but not too much for classic ASP. Are there any good input validation scripts that you use to avoid form injection attacks? I'm looking for good routines I can reuse on all of my form processing pages.
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I'm using if for when the user deletes a record from the database. People using the website try and delete more than one record at a t time by placing commas between the IDnumber ie. 1,2,5,9 etc.
This creates an error. So instead of this error appearing, how can I get a small alert box telling hte user he/or she has entered the wrong data type?
The code for the form is :-
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Is there a script that change email adrdresses to prevent SPAM.
ex: ticul@myprovider.com
I want it to appear like this on my webpage ticul@xxxxxxx.com or something that look like this
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In ASP classic pages,I want to know if it's possible to prevent
session variables from becoming zero length strings? I have tried
setting the Session.Timeout to a large value, but alwas, after 20
minutes, my session variable times out. I also tried setting the
session timeout in IIS manager to a high value, but this did no good
either.I just want to allow one particular session variable to last a long
time.
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I have a permission tracking app that I am working on, and I have made the insert page for it. I am having issues on how to prevent duplicates from getting entered.
Currently the interface for the app has a mixture of select boxes, list boxes and checkboxes. The form submits the page to processAIMR.asp and then does the inserting. I am using a loop to insert a new record for each checkbox checked or listbox entry selected. Code:
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Does anyone know how to prevent the browser from automatically adding the password to a form after a user name is entered? I need to be able to over ride the brower setting so turning off the option in IE is not really a solution.
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I have a form that sends info to a preview page, then to a thank you page. The thank you page gets the data passed from the rpeview page and sends an email.
How can I prevent the user from refreshing the page, so it doesn't send the email again.
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I would like to prevent a user from logging in with their user/password combination on a different computer or even a different browser window, if they are already logged in. I have a login page, from which I use a DB check to verify user/password info. Also, I have a bit loggedIN field in the DB, which I use to see if they are currently logged in; if so, I prevent them from logging in a second time.
Unless they click the "Log Out" button, then the DB value does not get changed. Any suggestions as to how I can log them out, even if they simply close the browser window or jump to a different page?
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For instance here's a simple select statement Code:
("SELECT a, b,c d, e, f FROM Table WHERE a = "&CInt(j)&" and c= 0")
j is a dimmed variable which is a and it's numeric. Is the above protected against any non numeric instances? Like j=2,345..i've tested this and it works i'm just trying to see if i've covered all my tracks.
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How do people go about preventing the user from submitting a form for a 2nd time? For example, the user submits a form, clicks on the back button, and the submits the form again. I have used various techniques in the past (depending on circumstances) but I'd be interested in the techniques you guys currently use.
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Is there a way in ASP to prevent including the same file more than once?
Example:
dbutil.asp needs constants.asp, so I include constants.asp inside dbutil.asp.
transact.asp also needs constants.asp, so I include constants.asp inside transact.asp.
transact.asp doesn't need stuff in dbutil.asp, and dbutil.asp doesn't need stuff in transact.asp.
Then later I might have a main.asp that needs both dbutil.asp and transact.asp. So I include them both. However, the constants.asp will be found to be included twice!
What can I do to creatively prevent multiple inclusion of the same file in ASP? I know how to do it in C and C++, but I can't apply that to ASP, it seems.
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I have created an Intranet in my office using ASP (of course). Within it is a booking system, allowing booking of conference rooms, digital camera and other equipment. It works perfectly...almost, as there is no way to prevent double bookings.
I really don't know where to begin with this one. All bookings go to an Access DB, into a single table. The bookings have a start time and an end time (24hr).
I would like it so that when the user submits the form, if there is a clash in times instead of saying, thanks for your booking, to redirect them back to the booking page saying there is already a booking for this time and that I am very sorry!
I guess I have to check some value in access and return the info back to the webpage before it chooses where to redirect the user.
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I am developing a Simple ASP Website with a login page. I want to
know how can I change Session ID after login and also Close the current
Session after User closes the Window or gets logged out of the Website. So
that every time user logs in into the website, Session ID will be unique.
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The subject sounds confusing but here is what i want to do. I have a
button on my page which says
OnClick="javascript:window.open('reportsContainer.asp?pag eURL=Report1.asp?intCurrentPage=1&blnRetrieveFlag=1&Show=1',TasksRPT');"
Now on the Conatiner.asp what i do is
if Request.QueryString("Show") = 1 then
pageURL = Request.QueryString("pageURL")
end if
And then i set the pageURL along with intCurrentPage and
blnRetrieveFlag parameters to my fram src as
<frame height=500 scrolling=auto name="pageFrame" id="pageFrame"
border=0 src="<%=pageURL%>">
Code:
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We have 2 domains for internal purposes: one for users (have to login
and domain has SSL) and another for sponsors (have to login and domain
does NOT have SSL).
Now when a user logs in and there are pages that have info from the
sponsors domain, users are asked to login again with a warning message
saying if they want to see secure and nonsecure information. How can
I bypass the second login? Is there something I can do in active
directory, IIS, or ASP to not have the second login appear?
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How can I prevent this from happening? For example when the asp
application works in a public terminal where we don't want successive
users to know the login password and user name of the previous ones?
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I recently built a login page and a friend of mine was working on something similar and said that I need to protect the login from SQL injection. I am not really sure what exactly that is. I think I have a rough idea but can someone explain it to me?
In addition, I will need to obviously protect what I built and am not sure how to go about doing that either.
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if anybody has a list of dodgy characters that can be used for sql injection attacks so that i can figure out a way to strip them from user inputs?
Also if somebody was filling in a form, that inserts into a "memo" field in access could this be used to launch such an attack or would whatever they type simply be inserted into the field? i hope that bit is clear.
i have a form field "message" which is a multi line text box, if someone typed into that box
DELETE * FROM Messages WHERE MessageID =1205
or some other command would that simply be inserted in to the database or would the server try and execute the command??
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I have heard a lot about SQL Injection. I was wondering how does an injector come to know about the table/column name when they cannot see the asp codes in a website?
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how do i test for SQL injection ?
sdo i do a SELECT statement in my username login?
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Is it possible to "intercept" all calls to conn.execute and have them go to
a checking routine that will either let the command go through or terminate
it if it contains some illegal instructions? My clients company has had its
hacker free status revoked due to the possibility of sql injection. I could
put a function before every single conn.execute but we have hundreds of
them. Just wondering if there is some way of telling it to do something else
first. Maybe I can redefine conn.execute somehow?
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I have written several site functions to hopefully prevent against cross-site hacking, sql injection, and url encoding. I also have a symetric key encryption that is pretty basic (which isn't posted here and is total overkill). I was wondering if these functions are protecting well enough, or am I missing some tests?
Function InjFix(val)
InjFix=SEncode(Trim(Replace(val,"'","''")))
end Function
Function SEncode(val)
SEncode=Server.HtmlEncode(val)
end Function
Function URLEncode(val)
URLEncode=Server.URLEncode(val)
end Function
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I am using the method below to make sure that the query isNumeric and not longer than 4. It's a little snippet I found in another post... It works fine but I'm questioning whether it's enough.
URls like this, itemdetail.asp?-=#&ItemID=906, don't throw any errors because the "ItemID=906" is fine. Does the method used below really protect against SQL Injections in this case?
Code: ....
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I have heard a lot about SQL Injection. I was wondering how does an injector come to know about the table/column name when they cannot see the asp codes in a website?
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I have feedback forms on several of my sites and recently, they have been plagued with email injection attacks.
The forms are pretty straight-forward. Half a dozen fields get submitted to a formhandler.asp page where the contents are sent to some hard-coded email addresses using ASPmail.
From what I understand about how this works, spambots are used to add carriage returns after some of the form fields and then adding BCCs in to use the form to send out spam to other addresses. Here's an example of the emails I'm getting: .....
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Anyone got some good methods for preventing html-injection in ASP?
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I have allways validated user input to pieces prior to integrating it into a SQL statement, in order to avoid SQL Injection attacs. A colleague of mine told me that binding my vars would make them SQL scalar, but I have been left in the dark as to HOW... The web left me none the wiser, as well, so here goes: Anyone got a brief example of binding vars in ASP to get me started?
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I believe someone is using my contact form and sending out spam. I'm getting thousands of undeliverable emails.
I don't know anything about asp. Someone who use to work here wrote the form processing script and it seems that all the forms on different domains are being processed by this script. It seems like they didn't do any sort of validation or checks and on one website there are hundreds of pages with the contact form, i could do it in php but that is way too much work.....
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I have just started a new job and I'm in charge of the databases at a college. We have a web page that the students can access to see their profile and course details. which is causing problems.
The students have to login into an e-learning site called moodle which is fine (moodle is all written in php). They can from there just browse moodle which has news and a message board etc. They can then also click a link to their profile, it is then directed to an asp page but it uses their login details from the php moodle site to retrieve their details from the database and display on the asp web page.
THE FOLLOWING IS A CODE EXTRACT....
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I have a multi-page ASP web application that uses information sent to it from the client in the Request.Forms collection, the Request.QueryString collection and the Request.Cookie collection.
What I want to do is to sanitise ALL the information sent to EVERY page.
I thought I'd achieve this by having an INCLUDE file inserted at the top of EVERY page.
This include file iterates through EVERY form, querystring and cookie item and removes anything that looks like malicious SQL injections from the values. Having completed this task, the many web pages then access the sanitised Request object with impunity.
One minor drawback is that it doesn't seem to work...I can't update the Request object with the sanitised value. [Error message: VBScript runtime error: Object doesn't suppor this property or method]
Either it's something silly in my coding or it's the wrong approach....please advise accordingly (code below).....
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To sanitise the input from a form before it gets sent as an email, is it simply a matter of
Replace(Request.Form("formName"), " ' ", " ' ' ")
or is there more to it than that?
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