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Cross Site Scripting and its Issues

Cross Site Scripting and its Issues. By Odion Oisamoje. What is XSS. Is a vulnerability that enables an attacker lure a computer user to download malicious JavaScript code from a trusted site. Types of XSS. Persistent Attack is stored on the website’s server.

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Cross Site Scripting and its Issues

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  1. Cross Site Scripting and its Issues By Odion Oisamoje

  2. What is XSS Is a vulnerability that enables an attacker lure a computer user to download malicious JavaScript code from a trusted site.

  3. Types of XSS • Persistent • Attack is stored on the website’s server. • Do not have to go through a link • Non-persistent • Most common • User has to go through a special link to be exposed • Code does not get stored on the server

  4. Types of XSS cont. Figure 1: A typical reflected or non-persistent cross site scripting scenario

  5. Type of XSS Cont. • DOM-based • An emerging area • Attacker code does not have to pass though the server to affect the visitor

  6. How it Works • http://www.youtube.com/watch?v=r79ozjCL7DA

  7. Famous Attack • “In 2005, a MySpace user named Samy discovered a unique way to expand hi buddy list. Within 24 hours, the number of friends in his page grew from 73 to more than 1 million. He achieved this instant popularity by creating the first self-propagating cross-site scripting (XSS) worm and by exploiting the lax security in many Web browsers” (Monthie, 2008).

  8. Prevention – Detection – Response • Reduce Impact • Sanitize input • Work back to the source • Input sanitation and validation on JavaScript code • Be proactive

  9. References • Monthie, B. (2008). What, who, when, where, why, how of XSS. Network World, 25(28), 26. Retrieved from EBSCOhost. • Cross-site Scripting (XSS). (2010, October 10). Retrieved April 15, 2011, from The Open Web Application Security Project (OWASP): https://www.owasp.org

  10. Q & A

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