Cross-site scripting (XSS)
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The document discusses exploiting an XSS vulnerability on a blog site's comment section to steal an administrator's session cookie. It describes inserting malicious JavaScript into a comment to alert the administrator of the XSS vulnerability. When the administrator views the comment, the script would steal their session cookie value, allowing the cookie to be used to log in as the admin. It then provides steps to set up a local web server hosting a PHP file to grab the cookie value when the victim views the blog post.
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Cross Site Scripting (XSS) attacks involve injecting malicious JavaScript code into a vulnerable web application that is then executed by a user's browser and can access cookies and private information. The document discusses how XSS works, including using a vulnerable script on a site that echoes back parameters without sanitization, allowing injected JavaScript to run. Variations and other ways to perform XSS are described, as well as the scope of what the malicious code can access and securing sites against these attacks.
Css
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Xss
Cross-site scripting (XSS) vulnerabilities allow attackers to inject client-side scripts into web pages viewed by other users. There are three main types of XSS attacks: stored XSS, where malicious scripts are permanently stored on the target servers; reflected XSS, where scripts are reflected off the web server in response to user requests; and DOM-based XSS, where scripts are executed after a page loads due to unsafe JavaScript handling of untrusted data. To prevent XSS, output variables should be encoded using the htmlentities function to replace special characters that could be parsed as active content.
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Cross site scripting
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There are lots of defense techniques introduced nowadays and even though the coding methods used by developers are evolving to counter attack cross site scripting techniques, still the security threat persist in many web applications for the following reasons:
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1) It defines XSS and explains that it allows attackers to inject client-side scripts.
2) It describes three types of XSS - stored (persistent), reflected (non-persistent), and DOM-based - and provides examples of each.
3) It discusses advanced techniques attackers use to bypass input filtering, such as uppercasing tags to avoid lowercase filters or using ASCII character codes.
Web Security
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SeanRobertsThesis
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Xss ppt
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i have done this with my own web application. if any mistakes let me know in comments
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Contents :
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- Description as A Widely Used Hacking Technique
- How it is used in Hacking
- What can be done with XSS
#XSS, #Hacking, #Security, #CookieStealing, #InternetBug, #HTMLInjection
Sincerely,
Irfad Imtiaz
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Cross Site Scripting (XSS) attacks involve injecting malicious JavaScript code into a vulnerable web application that is then executed by a user's browser and can access cookies and private information. The document discusses how XSS works, including using a vulnerable script on a site that echoes back parameters without sanitization, allowing injected JavaScript to run. Variations and other ways to perform XSS are described, as well as the scope of what the malicious code can access and securing sites against these attacks.
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Cross site scripting
Cross Site Scripting (XSS) is a type of vulnerability that allows attackers to inject client-side scripts into web pages viewed by other users. There are three main types: persistent XSS saves the attack script on the server; reflected XSS executes a script based on user-supplied input; and DOM-based XSS occurs when active browser content processes untrusted user input. Attackers use XSS to steal session cookies or other private information that can be used to impersonate users.
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xss-100908063522-phpapp02.pdf
This document discusses cross-site scripting (XSS) vulnerabilities. It explains that XSS allows malicious users to insert client-side scripts into web pages that are then executed by a user's browser when they visit the page. This can enable attackers to steal cookies and private information, perform actions as the user, and redirect users to malicious sites. The document outlines different types of XSS attacks, including non-persistent XSS that only affects the current user, persistent XSS where malicious code is saved to a database and affects all users, and DOM-based XSS that modifies the DOM environment. It provides examples of how XSS payloads can be inserted and recommendations for preventing XSS like sanitizing user input and output
Xssandcsrf
Cross-site scripting (XSS) and cross-site request forgery (CSRF) are web security vulnerabilities. XSS occurs when a malicious script is executed in a user's browser session from a web application. CSRF tricks a user's browser into making requests to a trusted site where the user is currently authenticated. The Samy worm exploited an XSS vulnerability on MySpace to propagate to over 1 million user profiles in under 24 hours. Developers can prevent XSS by validating and encoding all user input, and prevent CSRF by requiring secret tokens in POST requests.
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This document discusses web application security from the perspectives of web developers and attackers. It covers common issues web developers face, such as tight deadlines and lack of security standards. It also describes how attackers exploit vulnerabilities like injection attacks and XSS. Recent attacks are presented as examples, such as compromising a power grid operator's website through SQL injection. The document aims to raise awareness of web security challenges.
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Cross Site Scripting Defense Presentation
Cross site scripting (XSS) is a type of computer security vulnerability typically found in web applications, but in proposing defensive measures for cross site scripting the websites validate the user input and determine if they are vulnerable to cross site scripting. The major considerations are input validation and output sanitization.
There are lots of defense techniques introduced nowadays and even though the coding methods used by developers are evolving to counter attack cross site scripting techniques, still the security threat persist in many web applications for the following reasons:
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Cross Site Scripting (XSS) is a vulnerability that allows malicious users to insert client-side code into web pages that is then executed by a user's browser. This code can steal cookies, access private information, perform actions on the user's behalf, and redirect them to malicious websites. XSS works by having the server display input containing malicious JavaScript from a request. There are different types of XSS attacks, including non-persistent, persistent, and DOM-based attacks. Prevention methods include validating, sanitizing, and escaping all user input on the server-side and client-side. Web vulnerability scanners like Burp Suite can help test for XSS and other vulnerabilities.
Complete xss walkthrough
The document provides a complete walkthrough of cross-site scripting (XSS) vulnerabilities, including:
1) It defines XSS and explains that it allows attackers to inject client-side scripts.
2) It describes three types of XSS - stored (persistent), reflected (non-persistent), and DOM-based - and provides examples of each.
3) It discusses advanced techniques attackers use to bypass input filtering, such as uppercasing tags to avoid lowercase filters or using ASCII character codes.
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Web application attacks can take many forms, including cross-site scripting (XSS), SQL injection, parameter tampering, command injection, session management issues, cookie poisoning, directory traversal, cross-site request forgery, and buffer overflows. XSS is a vulnerability that allows malicious JavaScript code to be injected and run in a user's browser, potentially accessing data. SQL injection involves inserting SQL commands into a database query to gain unauthorized access. Parameter tampering modifies URL parameters to change expected behavior.
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A small PPT done by me about XSS it might helpfull for some one.
i have done this with my own web application. if any mistakes let me know in comments
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Introduction to Cross Site Scripting ( XSS )
Contents :
- Introduction
- Description as A Widely Used Hacking Technique
- How it is used in Hacking
- What can be done with XSS
#XSS, #Hacking, #Security, #CookieStealing, #InternetBug, #HTMLInjection
Sincerely,
Irfad Imtiaz
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Cross-site scripting (XSS)
- 5. XSS Vulnerability : post_comment.php page
- 7. Looks like a basic blog, with a comment section and an admin portal. Clicking on the Admin link sends us to the login page, and we know this is a XSS challenge, so the obvious place to start is on the comments form which contains the fields Title, Author and Text. Going for the most basic of basic XSS tests, we pop <script>alert(‘XSS’)</script> straight into the Text field and get confirmation that the site is indeed vulnerable to XSS:
- 8. The assumption here is that there is an administrator who at some point will review the posted comments on the site, and with a XSS vulnerability, we have a chance to steal his session cookie value and use it to log into the site as the admin.
- 9. Create File Code use some Javascript to run client-side in the victim’s browser, and some PHP code to grab the cookie value and store it in a variable. Let’s run a local web server to host this PHP an grab the cookie when the victim views our blog post. There are lots of ways to do this, here’s my way:
- 15. Edit and Forward
- 16. “/ADMIN/EDIT.PHP?ID=2 we get error message: Now we know that the web sites' absolute path is “/var/www/”
- 18. since the user is root, now we can deploy a webshell…
- 19. Now we can see that the fa1c0n.php is created successfully.
- 20. Now we can see that the fa1c0n_shell.php is created successfully.
- 22. Run SimpleHTTPServer Run Command wget Now we can see that the fa1c0n_backdoor.php is created successfully.
- 24. Open nc Config falc0n_backdoor Connect successfully.
- 25. Password admin Sqlmap dump with --cookie