1
vote
1answer
43 views

Is it safe to call an untrusted service with jquery.ajax and dataType 'jsonp'

From what I understand, the JSON-P technique generates a script tag into the DOM of an HTML page to get across the single-origin restrictions imposed on the XMLHttpRequest JavaScript API for AJAX ...
1
vote
1answer
65 views

XSS - history stealing

I am little confused about this matter. By simply writing a JavaScript code we can go through our browser history and identify visited links. It is fine. But how an attacker use this to identify a ...
1
vote
0answers
107 views

How should I mitigate the XSS vulnerabilities in KnockoutJS described at mustache-security?

The site Mustache-Security describes XSS vulnerabilities in KnockoutJS... The vulnerabilities come from the use of eval (or some equivalent) to convert text in the data-bind attribute to executable ...
1
vote
0answers
54 views

XSS Vectors for new Image()

What are possible XSS vectors to this JavaScript code new Image().src = encodeURI('[user url here]'); Let's assume two cases: [user url here] is some string provided by user (with no validation) ...
2
votes
3answers
146 views

Why are scripts injected through innerHTML not executed whilst onerror and other on<event> attributes on elements are? - Google XSS Challenge 2

SPOILER ALERT : Do not continue if you do not want to be spoiled I am currently doing the Google XSS Challenge Level 2 . I am injecting XSS code that is inserted into the document using ...
3
votes
4answers
280 views

How is this XSS attack working?

SPOILER ALERT: This question contains an answer to one of the problems from the Google's XSS Challenge! Please stop reading further if you're not interested in knowing the answer right now. I'm ...
2
votes
3answers
102 views

XSS prevention by black-listing

I have a reflected XSS vulnerability in my Web application. I have decided to take the black-list approach instead of the popular white-list approach. My question is can there exist a malicious ...
2
votes
2answers
125 views

XSS in HTML meta tag

There is a web application which contains a search function. When I search for aaaaaaaaxss I get this: <meta property="the:property" content="100 Results for aaaaaaaaxss (Page 1)" /> It strips ...
0
votes
3answers
126 views

Does this reflected XSS vulnerability pose any real threat?

I have a web site where users can enter some text into a textbox and that text is immediately rendered in a div using javascript (strictly front end). If a user enders something like this: This is ...
1
vote
1answer
92 views

BeeF - How does it work?

I'm mainly server sided. I haven't worked with JS that much before. My coworker was talking about beef and how it basically controls the victims browser just by a simple xss attack I was wondering ...
2
votes
2answers
233 views

DOM XSS attack failing in Firefox

I am trying to perform DOM XSS attack to exploit a vulnerability of localhost webpage. I am able to perform the attack successfully on IE-11 and Chrome. But Firefox is preventing me to perform the ...
1
vote
0answers
88 views

Hacking attempts:in.js

A client of mine keeps getting hacked by seemingly SQL injection where a script tag containing a link to an "in.js" file is added. Sometimes from a domain called sportserve.co.uk, other times from ...
0
votes
1answer
269 views

exploit document.write with unsanitized user input

I'm trying to inject javascript into a js scriptfile but it's not working. I have the following setup: html file with javascript-file include (all inline js is blocked!) Welcome, <script ...
0
votes
1answer
96 views

Is it html escape enough for mitigating all xss, if html is going to be generated only in client side?

If all html in a site is generated in client side (attributes, urls, styles everything will be concatenated in javascript and set as innerHTML), is it doing only html escape enough for mitigating all ...
1
vote
2answers
682 views

Is jQuery.val() enough to prevent XSS

Is obtaining the value of a textarea/input with the jQuery function .val() XSS-proof? <html> <textarea id="t1"></textarea> <script> var toBeDisplayed = ...
4
votes
1answer
134 views

Why would a user agent string be executed?

I'm having trouble understanding how a particular XSS vulnerability might arise in the real world. Guides for two of the exercises on hackthissite.org: ...
1
vote
1answer
230 views

Is it safe to use createHTMLDocument to sanitize HTML?

i'm wondering how safe it is to use createHTMLDocument to do HTML sanitization. I've tried to implement it like this: function sanitize(string) { var elm = ...
1
vote
1answer
68 views

Base Programming for vulnerabilities

Hello, I am a beginner looking for some information. My question is the following: In order to understand certain security concepts is it essential that I understand the underlying languages? For ...
1
vote
0answers
119 views

Can a Java servlet filter be used to pull out scripts that aren't whitelisted?

I might be asking a similar question to this: Whitelisting DOM elements to defeat XSS But I think my proposed solution is different and I was wondering if I could get the community to comment on ...
2
votes
2answers
798 views

XSS cookie stealing without redirecting to another page

I'm practicing in VM following the OWASP guide. I know that is possible to steal the cookie by redirecting to "False" page etc. but I would like to steal the cookie without redirecting on another ...
2
votes
1answer
538 views

Cross site Scripting in HTTP Method?

Lately, I've noticed that many web server configurations reflect the method of an HTTP request sent with a non implemented method in the body of the server's response. For example, A request sent ...
1
vote
1answer
619 views

UTF-7 XSS attacks in modern browsers

I've recently read about utf-7 XSS-attacks (i.e. Ned Batchelders article at http://nedbatchelder.com/blog/200704/xss_with_utf7.html) but could not get any UTF-7 attack to work in modern browsers. (I ...
5
votes
2answers
129 views

Any eventhandlers that apply to hidden elements?

Im trying to XSS a search field and my attack vector is getting reflected like this: <input type="text" id="txtRpHiddenKeyword" style="display: none;" value="ATTACK VECTOR HERE" /> Only ...
0
votes
1answer
94 views

Verifying one specific attack vector of Cross Site Scripting

Burp suggests that there is a reflection.. It changes a value of a cookie named as x as x=<script src=abc.js> and in response this value gets injected to a javascript function.. <script ...
-1
votes
1answer
319 views

Open Source tool for analysing javascript for security vulnerabilities [closed]

I am completely new to this field and am a college student. I am looking for a static code analysis tool that scans the source code of a web app ( NOT the URL) for security vulnerabilities. So far i ...
1
vote
1answer
1k views

Are these both cross frame scripting attacks?

I've received a recent security review of a website which mentioned it had a cross frame scripting vulnerability. In short, it mentioned that a malicious site could load the page up in an iframe, ...
0
votes
1answer
895 views

Calling JavaScript functions from within a Style tag XSS

I've identified an XSS in a client's application where they've failed to properly sanitize a variable. The application, however, is written in ASP.NET 2.x and they have request validation turned on. ...
1
vote
1answer
238 views

Is it possible to execute xss under these conditions?

Is it possible to execute xss under the following conditions? The following blocked characters and words are replaced with _. characters: > , : , ; , " , ' , # , ~ , \ , % , ( , ) , [ , ] , { , } ...
1
vote
3answers
341 views

What is the risk of cross site scripting if I embed javascript into a website

What is the risk of cross site scripting, if I embed javascript into a website? Quite simply, I am using a 'site builder', and they don't allow rotating images, but they allow you to embed code... So ...
2
votes
1answer
102 views

Unusual ownership-ID using localStorage; any possible issues?

I'm working on a small side project in PHP. I may yet include some sort of actual username/password registration down the line, but for now, for ease of attracting attention, my goal is to allow for ...
41
votes
3answers
3k views

I found obfuscated code in a comment on my blog. What should I do?

Today I was checking comments on my blog and I found a strange comment, here is the exact text <script>var ...
0
votes
2answers
361 views

Hide XSS payload

Scenario : There is a persistent XSS on a page with the username information. The username is present three times in the page, is visible only once and the visible one is correctly escaped. How ...
9
votes
3answers
343 views

How could the string \";alert('XSS');// be used for XSS?

I was using Burp Suite for some testing and I noticed that they included the following string: \";alert('XSS');// as an attack string for an XSS payload. How could this string be used to execute ...
2
votes
2answers
260 views

Exploiting flash XSS holes

I have a URL to a flash file. Sample :- http://abc.mydomain.com/Findme.swf Now, there is a parameter called xmlpath as :- http://abc.mydomain.com/Findme.swf?xmlPath=something. Is it not that ...
5
votes
2answers
456 views

How to ensure that files uploaded by users do not contain any XSS code

I have been working on providing the security related to the XSS attacks. My website only allows following mime-types: XML, CSV, HTML, PLAIN, VND_WAP_WML, APPLICATION_ZIP, APPLICATION_PDF, ...
4
votes
1answer
653 views

XSS JavaScript Double Quoted String with HTML Escaped Possible?

Is it possible to inject XSS in a JavaScript variable if a website inserts HTML encoded, user input in a double quoted string? var userString = "perfectly &quot;safe&quot; input from user?";
2
votes
1answer
246 views

Are GET, POST and windows.location vulnerable to XSS in a Wordpress theme?

I created a Wordpress theme for my client. He told me that he scanned my theme with a vulnerability scanner, and that it has security issues with the GET and windows.location methods. Is this really ...
-3
votes
1answer
454 views

Cross-site request forgery attack. How can we stopped this? [closed]

On one of our websites, we are seeing this code is adding itself. I tried to figured out but no success. One thing I have noticed when I removed the html, head and body starting tags, it's gone. Our ...
2
votes
3answers
974 views

Why is the Samy Worm considered XSS?

Last night I was browsing notable computer attacks and came across the Samy worm, which apparently affected a huge portion of the MySpace network -- over one million users in under 24 hours, according ...
13
votes
3answers
2k views

Cross Site Scripting without special chars

I'm testing a web application and I found a XSS vulnerability. I can break a tag and inject some code to the application but nothing potentialy dangerous for the client. The application has a filter ...
7
votes
2answers
351 views

Best practices for integrating external javascript?

I'm looking for some standard pieces of advice on how to integrate external JavaScript into a website. For example, on mywebsite.com: <script ...
2
votes
2answers
137 views

Is it safer to store the XSRF value inside your JavaScript?

To protect yourself against XSRF, you need to have a separate token on a page. See: Coding Horror: Preventing CSRF and XSRF Attacks, by Jeff Atwood As the posting suggests, its best to have those ...
10
votes
5answers
1k views

CSRF protection with Session Id

To protect against CSRF, couldn't my page javascript just dynamically insert the session id from the cookie into the body of each HTTP request right before it's sent? The server would then just ...
4
votes
2answers
573 views

XSS: Parsing Javascript

Reading about DOM based XSS from http://www.webappsec.org/projects/articles/071105.shtml It illustrates some examples like: ...
0
votes
1answer
1k views

Security Testing AngularJS Web Application

An angularjs application stores user input to local/sessionStorage and retrieves it later to fill the form fields or display that content later. If a javascript is submitted as user input, it gets ...
7
votes
3answers
2k views

Is there a way to bypass Django's XSS escaping with “unicode”?

Django (the Python web framework) escapes output to prevent XSS (Cross Site Scripting) attacks. It replaces ', ", <, >, & with their HTML safe versions. However this presentation on slide ...
1
vote
1answer
929 views

bypass a regex filtration to perform an xss attack

Does the regex [\w/$!.*-]+$ stop the injection of payloads like : "><script>alert(4)</script> " onload="alert(4)" ...
-1
votes
1answer
270 views

can someone break my anti dom based xss from the window location? [closed]

can someone break my anti dom based xss from the window location ? function parseparameters() { var href = window.location.href; var id = href.indexOf('#'); if (id ...
-1
votes
1answer
226 views

some questions about DOM based XSS [closed]

Is it possible to do a DOM based xss attack with window.location.protocol? How can we use dom based xss with document.title? How can we bypass the escape javascript function if it is used? thank ...
0
votes
1answer
567 views

Sanitizing JavaScript to prevent XSS

I'm going through a vulnerability remediation exercise for a client and am trying to figure out how to best mitigate this particular hole. There's a script on our site that calls up content into a new ...