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Understanding and Mitigating Common Input Security Risks

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Learn about SQL Injection, Cross Site Scripting, Denial of Service, and more. Explore mitigation techniques to secure your applications.

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Understanding and Mitigating Common Input Security Risks

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  1. Example – SQL Injection MySQL & PHP code: // The next instruction prompts the user is to supply an ID $personID = getIDstringFromUser(); $sqlQuery = "SELECT * FROM Users WHERE userID = " + $personID; What if the user supplies the following string for $personID? The resulting string assigned to sqlQuery is SELECT * FROM Users WHERE userID = _________ What if the user supplies the following string for $personID?

  2. Input Validation – common associated risks • ______________ • user input controls SQL statements ultimately executed • by a database server • http://www.tizag.com/mysqlTutorial/mysql-php-sql-injection.php • ______________ • user input controls file access location – the “double-dot attack” • ______________ • user input controls file naming in such a way as to get a program to • read, write or delete files that should be protected • Denial of Service • user input controls causes application to consume excessive resources • or simply stop executing due to unacceptable input • _______________ • user input controls causes the application to reveal confidential information • perhaps this information can be used as part of a more sophisticated attack Please check out OWASP

  3. more common associated risks • Cross Site Scripting (XSS) • user input controls injects HTML or script commands into Web • application causing the Web application to breach its security • http://www.acunetix.com/websitesecurity/xss.htm <html> <head> <title>My Javascript Page</title> </head> <body> type your name here >>> <input type="text" id="userInput"></input> <button onclick="buttonHandler()">Submit</button> <script> var thing = "blah"; function buttonHandler() { var stuff = document.getElementById("userInput").value; document.write(stuff); } </script> </body> </html>

  4. still more common associated risks • ______________ • user input injects commands, often via meta-characters, that cause • a server to perform unintended functions • Buffer Overflows • user input controls exceeds limits in a way that allows the attacker • to control application behavior

  5. Before Mitigation Step 1 -  user interface  files  parameters of externally-invoked methods  network sockets/ports  network certificates  URLs (passed to Web servers)  cookies Step 2 - Step 3 –

  6. Mitigation Techniques Bounds Checking Pattern Matching Data Reflecting Sanitizing Double Decoding Escaping Text Full Syntactic Analysis Exception Handling

  7. Escaping Text Escaping individual characters is a particularly effective way of mitigating XSS.

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