SQL Injection. Many web developers are unaware of how SQL queries can be tampered with, and assume that an SQL query is a trusted command. It means that SQL. SQL commands are to be run using the osql.exe program under the system administrator account specifying the E parameter. Obviously, you should specify the real name. Project Overview. The Web Hacking Incident Database, or WHID for short, is a Web Application Security Consortium project dedicated to maintaining a list of web.
SQL Injection Walkthrough. Introduction. When a machine has only port 8. SQL injection is one of type of web hacking that require nothing but port 8.
Security testing of web applications against SQL Injection, explained with simple examples – By Inder P Singh. Many applications use some type of a database.
It attacks on the web application (like ASP, JSP, PHP, CGI, etc) itself rather than on the web server or services running in the OS. This article does not introduce anything new, SQL injection has been widely written and used in the wild. We wrote the article because we would like to document some of our pen- test using SQL injection and hope that it may be of some use to others.
SQL Server database administrators (DBAs) and developers, as well as third-party SQL Server product vendors, have created numerous free SQL Server tools to solve. Ongoing coverage of technologies and methods for tracking security events, threats, and anomalies in order to detect and stop cyber attacks.
Steve Friedl's Unixwiz.net Tech Tips SQL Injection Attacks by Example.
You may find a trick or two but please check out the . Many web pages take parameters from web user, and make SQL query to the database. Take for instance when a user login, web page that user name and password and make SQL query to the database to check if a user has valid name and password. With SQL Injection, it is possible for us to send crafted user name and/or password field that will change the SQL query and thus grant us something else. What do you need?
Any web browser. 2. What you should look for? Try to look for pages that allow you to submit data, i. Sometimes, HTML pages use POST command to send parameters to another ASP page. Therefore, you may not see the parameters in the URL. However, you can check the source code of the HTML, and look for .
You may find something like this in some HTML codes: < FORM action=Search/search. A value=C> < /FORM> Everything between the < FORM> and < /FORM> have potential parameters that might be useful (exploit wise). What if you can't find any page that takes input? You should look for pages like ASP, JSP, CGI, or PHP web pages. Try to look especially for URL that takes parameters, like: http: //duck/index.
How do you test if it is vulnerable? Start with a single quote trick. Input something like: hi' or 1=1- -Into login, or password, or even in the URL.
Example: - Login: hi' or 1=1- -- Pass: hi' or 1=1- -- http: //duck/index. If you must do this with a hidden field, just download the source HTML from the site, save it in your hard disk, modify the URL and hidden field accordingly. Example: < FORM action=http: //duck/Search/search. A value=. 3. 1 But why ' or 1=1- -? Let us look at another example why ' or 1=1- - is important. Other than bypassing login, it is also possible to view extra information that is not normally available. Take an asp page that will link you to another page with the following URL: http: //duck/index.
In the URL, 'category' is the variable name, and 'food' is the value assigned to the variable. In order to do that, an ASP might contain the following code (OK, this is the actual code that we created for this exercise): v. A double dash . Sometimes, it may be possible to replace double dash with single hash . Default installation of MS SQL Server is running as SYSTEM, which is equivalent to Administrator access in Windows. We can use stored procedures like master. To verify that the command executed successfully, you can listen to ICMP packet from 1.
If you do not get any ping request from the server, and get error message indicating permission error, it is possible that the administrator has limited Web User access to these stored procedures. How to get output of my SQL query? It is possible to use sp. Take the following page for example: http: //duck/index.
We will try to UNION the integer '1. UNION SELECT TOP 1 TABLE. It was chosen because we know it always exists. Our query: SELECT TOP 1 TABLE.
When we UNION this string value to an integer 1. MS SQL Server will try to convert a string (nvarchar) to an integer. This will produce an error, since we cannot convert nvarchar to int.
The server will display the following error: Microsoft OLE DB Provider for ODBC Drivers error '8. In this case, we have obtained the first table name in the database, which is . In this case, we will get the first table name that matches the criteria, .
We know this when we get the following error message: http: //duck/index. UNION SELECT TOP 1 COLUMN. Finally, to get the password of .
We cannot get any error message if we are trying to convert text that consists of valid number (character between 0- 9 only). Let say we are trying to get password of . The reason being, the password . Since it is a valid UNION statement, SQL server will not throw ODBC error message, and thus, we will not be able to retrieve any numeric entry. To solve this problem, we can append the numeric string with some alphabets to make sure the conversion fail. Let us try this query instead: http: //duck/index.
UNION SELECT TOP 1 convert(int, password%2b'%2. FROM admin. We will append '(space)morpheus' into the actual password. Therefore, even if we have a numeric string '3. By manually calling the convert() function, trying to convert '3. SQL Server will throw out ODBC error message: Microsoft OLE DB Provider for ODBC Drivers error '8.
For example, to change password for . Or using ISNUMERIC to make sure it is an integer.