Introducing Msd
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The document introduces the Malware Script Detector (MSD), a Greasemonkey script and standalone JavaScript file that detects malicious JavaScript on web pages. MSD was designed to detect popular attack frameworks like XSS-Proxy and BeEF by checking for exploits like data URI handling, Java/file protocols, and Unicode/null-byte injections. It covers both the Greasemonkey and standalone versions, their objectives, versions, and deployment methods. Weaknesses are acknowledged around form data and full protection, but MSD provides detection of client-side attacks that may not be caught by server-side defenses.
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Sincerely,
Irfad Imtiaz
A Survey of Exploitation and Detection Methods of XSS Vulnerabilities.pptx
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Cross Site Scripting ( XSS)
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Cisco WebEx vulnerability: it’s a kind of magic
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4.Xss
4.Xssphanleson The document discusses cross-site scripting (XSS) vulnerabilities. It defines XSS as allowing malicious scripts to be served to users from a vulnerable website. There are different types of XSS vulnerabilities including those without storage and with storage of malicious scripts on the website. The document provides examples of XSS vulnerabilities and discusses how they can be used to steal user credentials and track users. It also outlines challenges in preventing XSS vulnerabilities.
Complete xss walkthrough
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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.
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Lab-8: Web Hacking
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1) Websites have to be reachable from the Internet. Their primary purpose is to publish something or provide some service for the public
2) There are more than 1 billion websites as almost every organization, and many individuals have websites
3) As opposed to the earlier years of the world wide web, websites are very dynamic today. They come with forms and dynamic applications implemented by many different frontend and backend technologies. A wide variety of dynamic applications not only bring more functionality to web applications but also introduces vulnerabilities.
As a result, we are talking about something valuable that is billions in amount, accessible by anybody, and a commonplace for wrong implementation and vulnerabilities.Section-1: Exploit Cross-Site Scripting (XSS) Vulnerability
An XSS attack enables malicious users to inject client-side scripts such as JavaScript codes into web pages viewed by other users. The term XSS is used to describe both the vulnerability and the attack type, such as XSS attack / XSS vulnerability on the web application.
1) Log into Windows 7 Attacker on the Netlab environment.
2) Open Firefox by clicking the icon on the desktop or start menu
3) Visit this page
http://192.168.2.15/dvwa/login.php
This is the "Damn Vulnerable Web Application" hosted on the OWASP BWA machine on Netlab.
4)
Log in to web application by typing
user as Username and
user as Password. After logging in, you will see the page below.
5) Click on the XSS reflected on the left menu and type your nickname into the textbook at the right pane of the webpage. (I typed "ethical" and clicked the submit button. The web application gets what you typed as the input, add Hello to the beginning, and prints to the screen.
6)
Try some basic HTML tags now. Type
<h1>your nickname</h1>
I typed "<h1>ethical</h1> and then clicked submit button. I confirm .
React security vulnerabilities
React security vulnerabilitiesAngelinaJasper The document discusses common security vulnerabilities in React applications such as cross-site scripting (XSS), injection attacks, CSRF attacks, malicious file uploads, insufficient authorization and authentication, distributed denial of service (DDoS) attacks, and XML external entity (XXE) attacks. It provides recommendations for how to prevent and fix each vulnerability, such as strict escaping to prevent XSS, validating all uploads, and using JSON web tokens for authorization. The document also mentions other vulnerabilities to consider like server-side rendering security and dangerous URI schemes.
Cross site scripting
Cross site scriptingHarishKumar1779 Cross-site scripting (XSS) is a client-side attack where malicious JavaScript code is executed by a user's browser if they visit a link or page containing the code. This can allow attackers to steal users' session cookies, inject other malicious links or scripts onto pages, and access users' webcams or microphones. While users can't fully prevent XSS vulnerabilities themselves since they are on websites, they can use separate browsers for personal and suspicious links, disable JavaScript, keep browsers updated, and limit permissions to help reduce risks from XSS attacks.
SeanRobertsThesis
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ImageSubXSS: an image substitute technique to prevent Cross-Site Scripting at...
ImageSubXSS: an image substitute technique to prevent Cross-Site Scripting at...IJECEIAES Cross-Site Scripting (XSS) is one of serious web application attack. Web applications are involved in every activity of human life. JavaScript plays a major role in these web applications. In XSS attacks hacker inject malicious JavaScript into a trusted web application, execution of that malicious script may steal sensitive information from the user. Previous solutions to prevent XSS attacks require a lot of effort to integrate into existing web applications, some solutions works at client-side and some solutions works based on filter list which needs to be updated regularly. In this paper, we propose an Image Substitute technique (ImageSubXSS) to prevent Cross-Site Scripting attacks which works at the server-side. The proposed solution is implemented and evaluated on a number of XSS attacks. With a single line, developers can integrate ImageSubXSS into their applications and the proposed solution is able to prevent XSS attacks effectively.
Hack miami emiliocasbas
Hack miami emiliocasbasEmilio Casbas The document discusses raising security awareness among web owners and users. It notes that there are around 30,000 new malicious URLs daily and that 80% of legitimate websites are compromised due to a lack of security awareness by web owners. The document proposes creating a service called "Desenmascara.me" that would give websites a security awareness score, detect suspicious content, and help decrease the number of compromised sites by promoting better security practices.
Xss 101 by-sai-shanthan
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Xss 101
Xss 101n|u - The Open Security Community Cross Site Scripting (XSS) allows malicious users to insert client-side scripts into web pages by exploiting vulnerabilities. There are three main types of XSS attacks: non-persistent XSS only affects the current user, while persistent XSS saves the malicious script to databases and can target multiple users. DOM-based XSS modifies the DOM environment rather than HTTP responses. XSS can be used to steal cookies, hijack sessions, modify page content, and redirect users. Developers can prevent XSS by validating, sanitizing, and escaping all user input, and by implementing output encoding.
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XSS.pdf
XSS.pdfOkan YILDIZ
With the increased number of web applications, web security is be- coming more and more significant. Cross-Site Scripting vulnerability, abbreviated as XSS, is a common web vulnerability. Exploiting XSS vulnerabilities can cause hijacked user sessions, malicious code injec- tions into web applications, and critical information stealing. This article gives brief information about XSS, discusses its types, and de- signs a demo website to demonstrate attack processes of common XSS exploitation scenarios. The article also shows how to prevent XSS at- tacks with code illustrations.
XSS.pdf
XSS.pdfOkan YILDIZ Abstract
With the increased number of web applications, web security is be- coming more and more significant. Cross-Site Scripting vulnerability, abbreviated as XSS, is a common web vulnerability. Exploiting XSS vulnerabilities can cause hijacked user sessions, malicious code injec- tions into web applications, and critical information stealing. This article gives brief information about XSS, discusses its types, and de- signs a demo website to demonstrate attack processes of common XSS exploitation scenarios. The article also shows how to prevent XSS at- tacks with code illustrations.
I'm in ur browser, pwning your stuff - Attacking (with) Google Chrome Extensions
I'm in ur browser, pwning your stuff - Attacking (with) Google Chrome ExtensionsKrzysztof Kotowicz This document discusses attacking Chrome extensions through exploiting vulnerabilities in their architecture and code. It begins by explaining the components and permissions model of Chrome extensions. It then describes how to exploit vulnerabilities like DOM XSS in extensions' UI pages under the legacy v1 model. The document outlines fixes made in the v2 model but still finds ways to bypass security restrictions, such as through content script XSS. It introduces tools like XSSChEF and Mosquito for exploiting extensions. The presentation concludes by noting CSP should only be seen as a mitigation rather than prevention for extension vulnerabilities.
Analysis of XSS attack Mitigation techniques based on Platforms and Browsers
Analysis of XSS attack Mitigation techniques based on Platforms and Browserscscpconf In the recent years, everything is in web. It may be Organization’s administration software,
Custom ERP application, Employee portals or Real estate portals. The Social networking sites
like Face book, Twitter, MySpace which is a web application is been used by millions of users
around the world. So web applications have become very popular among users. Hence they are
observed and may be exploited by hackers. Researchers and industry experts state that the
Cross-site Scripting (XSS) is the one of the top most vulnerabilities in the web application. The
cross-site scripting has become a common vulnerability of many web sites and web
applications. XSS consists in the exploitation of input validation flaws, with the purpose of
injecting arbitrary script code which is later executed at the web browser of the victim.
According to OSWAP, Cross-site scripting attacks on web applications have experienced an
important rise in recent year. This demands an efficient approach on the server side to protect
the users of the application as the reason for the vulnerability primarily lies on the server side.
The actual exploitation is within the victim’s web browser on the client-side. Therefore, an
operator of a web application has only very limited evidence of XSS issues. However, there are
many solutions for this vulnerability. But such techniques may degrade the performance of the
system. In such scenarios challenge is to decide which method, platform, browser and
middleware can be used to overcome the vulnerabilities, with reasonable performance over
head to the system. Inspired by this problem, we present performance comparison of two mitigation techniques for Cross-site Scripting (XSS) at the server side based on the parameters like application’s platform, middleware technology and browser used by the end user. We implemented Mitigation parsing technique using database and replace technique in different platforms, middleware and checked its performance. We calculated the time taken by different browsers to render the pages using two techniques under different platform and middleware. In this paper we proposed the best combination of development platform, browser and the middleware for the two mitigation technique with respect to developer and end users.
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- 1. Introducing The Malware Script Detector (MSD) By d0ubl3_h3lix http ://yehg.net Tue Feb 19 2008
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- 5. Overview (Cont.) Coded mainly to detect today’s popular powerfully malicious JavaScript attack frameworks: XSS-Proxy, XSS-Shell, AttackAPI, BeEF Version 2 was enhanced to prevent most XSS threats and includes XSS Attack Blacklists based on Firefox XSS-Warning addon
- 6. XSS Coverage MSD was coded to detect the following XSS exploitation areas: data: protocol exploitation like - data:image/gif - data:text/javascript - data:text/html jar: protocol exploitation file: protocol exploitation by locally saved malicious web pages
- 7. XSS Coverage Other protocol exploitation such as vbscript:, livescript:, mocha:, ftp:, mocha:, telnet:, ftp:, res:, x-gadget(MS-Vista), call (VOIP), aim: …etc unicode injection utf-7,null-byte (\00), black slash injection (u\r\l), comments star slash injection (/* */),injection like \u00, \x00....etc
- 8. XSS Coverage MSD was thoroughly tested with: - RSnake’s XSS CheatSheet - XSS-ME Addon Attack List - Dabbledb.com’s Xssdb list - CAL9000 XSS List
- 9. Versioning Info GreaseMonkey Version Main Objective: Alert XSS Attacks to users Must be Installed by users Requires Gecko Browser + GreaseMonkey Addon Version 1 – Detect Malware Scripts Version 2 – Detect Malware Scripts + Prevailing XSS
- 10. Versioning Info Standalone Version Main Objective: Alert XSS Attacks to users & webmaster Must be Deployed by web developers Browser-Independent No Checking if users have GreaseMonkey version Version 1 – Detect Malware Scripts + Prevailing XSS
- 11. Standalone MSD Standalone version was created as single .js file for web developers To embed in their footer files To notify both visitors and webmasters of XSS injection attempts & attacks Browser-independent unlike GreaseMonkey Script version Intended for web application security as a portable lightweight solution
- 14. Why MSD? XSS Payloads like http://victim/?q=“><script>eval(location.hash.substr(1))</script>#xxxxxxxxxxxxxxxxxxxxxxMaliciousxxxxxPayloadsxxxxxxxxxxxxxxxxxxxxMaliciousxxxxxPayloadsxxxxxxxMaliciousxxxxxPayloadsxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx…..etc
- 15. Why MSD? (Cont.) Never get DETECTED by Web Server-level Firewall/IDS/IPS Because the code is Totally Executed at Client’s Browser
- 16. Why MSD? (Cont.) Malicious sites intentionally embed malicious JavaScript attack frameworks Bad guys 0wn web server boxes, and secretly install those attack frameworks as web backdoors or trojans to abuse users
- 17. Why MSD? (Cont.) No ways to detect such Malware scripts unless we check HTML source codes Disabling JavaScript, Using NoScript/VMware, Always Checking source codes are not effective solutions for most cases According to above scenarios, MSD becomes a nice solution for us
- 18. Oh, But …
- 19. Weaknesses Doesn’t check POSTS/COOKIES variables No guarantee for full protection of XSS Many ways to bypass MSD XSS Filtering needs to be updated regularly where extensive filtering may cause false alerts and much annoyance to users
- 20. Where Can I get it ? Check Under Tools Section http://yehg.net/lab/#tools.greasemonkey If you wish to contribute, there is a smoketest page. Insert your own XSS payload to defeat MSD. Notify me of whenever new Attack frameworks are created
- 21. Special Thanks Goes to Mario, http://php-ids.org Secgeek, http://www.secgeek s .com Andres Riancho , http://w3af.sf.net For encouragements and suggestions
- 22. Reference XSS Attacks & Defenses by PDP, RSnake, Jeremiah, Aton Rager, Seth Fogie Syngress Publishing ISBN-13:987-1-59749-154-9
- 23. Thank you!
Editor's Notes
- #2: Templates created by Aung Khant <[email protected]>