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(>) and a right (<) angle bracket, which may be interpreted as closing the previous HTML tag and beginning a new one You can also hex-encode input to create myriad variations Here are some examples: %3c instead of < %3e instead of > %22 instead of We recommend checking out RSnake s XSS Cheatsheet at http://hackersorg/xsshtml for hundreds of XSS variants like these
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The following general approaches for preventing cross-site scripting attacks are recommended: Filter input parameters for special characters no web application should accept the following characters within input if at all possible: < > ( ) # & HTML-encode output so that even if special characters are input, they appear harmless to subsequent users of the application Alternatively, you can simply lter special characters in output (achieving defense in depth )
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If your application sets cookies, use Microsoft s HttpOnly cookies (web clients must use Internet Explorer 6 SP1 or greater and Mozilla Firefox 2005 or later) This can be set in the HTTP response header It marks cookies as HttpOnly, thus preventing them from being accessed by scripts, even by the website that set the cookies in the rst place Therefore, even if your application has an XSS vulnerability, if your users use IE6 SP1 or greater, your application s cookies cannot be accessed by malicious XSS payloads See http://msdnmicrosoft com/workshop/author/dhtml/httponly_cookiesasp for more information Analyze your applications for XSS vulnerabilities on a regular basis using the many tools and techniques outlined in this chapter, and x what you nd
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Most modern web applications rely on dynamic content to achieve the appeal of traditional desktop windowing programs This dynamism is typically achieved by retrieving updated data from a database or an external service In response to a request for a web page, the application will generate a query, often incorporating portions of the request into the query If the application isn t careful about how it constructs the query, an attacker can alter the query, changing how it is processed by the external service These injection flaws can be devastating, since the service often trusts the web application fully and may even be safely ensconced behind several firewalls One of the more popular platforms for web datastores is SQL, and many web applications are based entirely on front-end scripts that simply query a SQL database, either on the web server itself or a separate back-end system One of the most insidious attacks on a web application involves hijacking the queries used by the front-end scripts themselves to attain control of the application or its data One of the most efficient mechanisms for achieving this is a technique called SQL injection While injection flaws can affect nearly every kind of external service, from mail servers to web services to directory servers, SQL injection is by far the most prevalent and readily abused of these flaws SQL injection refers to inputting raw SQL queries into an application to perform an unexpected action Often, existing queries are simply edited to achieve the same results SQL is easily manipulated by the placement of even a single character in a judiciously chosen spot, causing the entire query to behave in quite malicious ways Some of the characters commonly used for such input validation attacks include the backtick (`), the double dash (--), and the semicolon (;), all of which have special meaning in SQL
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Hacking Exposed 6: Network Security Secrets & Solutions
What sorts of things can a crafty hacker do with a usurped SQL query Well, for starters, they could potentially access unauthorized data With even sneakier techniques, they can bypass authentication or even gain complete control over the web server or back-end SQL system Let s take a look at what s possible Examples of SQL Injections To see whether the application is vulnerable to SQL injections, type any of the input listed in Table 11-5 in the form fields The results of these queries may not always be visible to the attacker through the application presentation interface, but the injection attack may still be effective So-called blind SQL injection is the art of injecting queries like those in Table 11-5 into an application where the result is not directly visible to the attacker Working only with subtle changes in the application s behavior, the attacker then must use more elaborate queries to try and piece together a series of statements that add up to a more severe
Bypassing Authentication To authenticate without any credentials: To authenticate with just the username: To authenticate as the rst user in the users table: To authenticate as a ctional user: Causing Destruction To drop a database table: To shut down the database remotely: Executing xp_ cmdshell to get a directory listing: Executing xp_ servicecontrol to manipulate services: Username: ;drop table users Username: aaaaaaaaaaaaaaa Password: ; shutdown http://localhost/script 0 ;EXEC+master xp_ cmdshell+ dir ; http://localhost/script 0 ;EXEC+masterxp_ service control+ start ,+ server ; Username: OR = Password: OR = Username: admin -Username: or 1=1
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