modul:m183:learningunits:lu10:lu10a

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modul:m183:learningunits:lu10:lu10a [2025/12/27 19:08] – dgaravaldimodul:m183:learningunits:lu10:lu10a [2025/12/27 21:02] (aktuell) – dgaravaldi
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-\\ +==== Types of XSS Attacks ====
-===== Types of XSS Attacks =====+
  
 There are **two major types** of cross-site scripting attacks commonly discussed: There are **two major types** of cross-site scripting attacks commonly discussed:
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   * **Reflected XSS (Non-Persistent)** – A malicious script is embedded in a URL or request, then reflected off the web server back to the user’s browser when the link is visited.    * **Reflected XSS (Non-Persistent)** – A malicious script is embedded in a URL or request, then reflected off the web server back to the user’s browser when the link is visited. 
  
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-===== What is Stored Cross-Site Scripting =====+==== What is Stored Cross-Site Scripting ====
  
  
 To execute a **stored XSS attack**, the attacker must find a vulnerability in a web application where user input is stored without proper validation or escaping. A common example is when a comment field or form accepts HTML input and embeds it directly into pages viewed by other users.  To execute a **stored XSS attack**, the attacker must find a vulnerability in a web application where user input is stored without proper validation or escaping. A common example is when a comment field or form accepts HTML input and embeds it directly into pages viewed by other users. 
- 
-{{stored_xss_example.png?300}} 
  
 **Example**: An attacker enters a comment containing JavaScript that steals session cookies. Every visitor who views the comment will run the malicious script unknowingly.  **Example**: An attacker enters a comment containing JavaScript that steals session cookies. Every visitor who views the comment will run the malicious script unknowingly. 
  
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-\\ +==== Stored XSS Attack — Step by Step ==== 
-===== Stored XSS Attack — Step by Step ===== +{{:modul:m183:learningunits:lu10:stored-xss.png?600}} 
-1. The attacker discovers a page with an input field that allows HTML.  + 
-2. They insert malicious JavaScript code into that field.  +    - The attacker discovers a page with an input field that allows HTML. 
-3. The application stores and later serves that code as part of normal content.  +    - They insert malicious JavaScript code into that field.  
-4. When other users visit the page, their browser executes the attack script. +    - The application stores and later serves that code as part of normal content. 
 +    - When other users visit the page, their browser executes the attack script. 
  
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-\\ +==== How Stored XSS Endangers Users ====
-===== How Stored XSS Endangers Users =====+
 Stored XSS is especially dangerous because: Stored XSS is especially dangerous because:
  
-* It can impact **all users** who view the infected page.  +  * It can impact **all users** who view the infected page.  
-* Attacker-controlled scripts can steal session credentials or redirect users to phishing sites.  +  * Attacker-controlled scripts can steal session credentials or redirect users to phishing sites.  
-* Malicious payloads can embed external JavaScript that reports user data back to the attacker. +  * Malicious payloads can embed external JavaScript that reports user data back to the attacker. 
  
 +\\
 +==== Related Topics ====
 +[1]: https://owasp.org/www-community/attacks/xss/ "Cross Site Scripting (XSS) | OWASP"
  
-===== Related Topics ===== +[2]: https://developer.mozilla.org/docs/Web/Security/Attacks/XSS?utm_source=chatgpt.com "Cross-site scripting (XSS) - Security | MDN"
-[1]: https://www.imperva.com/learn/application-security/cross-site-scripting-xss-attacks/?utm_source=chatgpt.com "What is XSS | Stored Cross Site Scripting Example - Imperva" +
-[2]: https://www.imperva.com/learn/application-security/reflected-xss-attacks/?utm_source=chatgpt.com "Reflected XSS | How to Prevent a Non-Persistent Attack - Imperva" +
-[3]: https://developer.mozilla.org/docs/Web/Security/Attacks/XSS?utm_source=chatgpt.com "Cross-site scripting (XSS) - Security | MDN"+
  
  • modul/m183/learningunits/lu10/lu10a.1766858886.txt.gz
  • Zuletzt geändert: 2025/12/27 19:08
  • von dgaravaldi