Cross-Site Scripting: An attack method that involves injection of code or markup into a webpage. There are three major types of XSS: Reflected XSS, Stored XSS (aka persistent XSS), DOM-based XSS (aka client side XSS).

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How do hackers deploy keyloggers?

I know the use of keyloggers. What I wish to know is how a hacker can install the keylogger onto the victim's system? If it can be done by XSS then to where this keylogger is actually installed (I ...
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1answer
15 views

Possible security issues with on demand generated image from database

I want to know what could be the potential risk with the displaying part of this behavior. For the upload part : 1- A form with a file upload for image. 2- Image content is save into Mysql ...
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3answers
71 views

Why doesn't this XSS attack work?

I have a site that has the following javascript that is being executed: var t=location.hash.slice(1); $("div[id="+t+"]").text("The DOM is now loaded and can be manipulated."); I was thinking that ...
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42 views

How to exploit this DOM xss?

I was looking for XSS and I found this website. I am struggling with this xss exploitation, but I don't know what do. Could you please help me? LINK: ...
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1answer
50 views

Basic Website Protection (XSS,SQL-inject,hashing)

I have a very simple app that does allow unauthenticated users to leave comments (maybe later I will incorporate a capatcha). The app then stores the comments in a mysql db. I do my best to filter out ...
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1answer
56 views

XSS: alert() not executed on different OS/computer

I've encountered a strange behavior while I was performing a security audit of a web application. Some user controlled inputs were displaying their values, unencoded, into the page that processed the ...
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1answer
96 views

Can running a script while logged in compromise my facebook password?

In websites related to facebook malware analysis and information, we often see messages to the effect of if you have run this facebook app then your account has been compromised, or if you went to ...
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2answers
83 views

How can I bypass double quotes in a attribute based xss attack

The code that I have is: <input type="text" name="some_name" value="<?php echo CHtml::encode($str); ?>" /> $str is the input data. 'CHtml::encode()' is Yii's way of encoding special ...
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31 views

Is addslashes + htmlentities sufficiently secure?

I have addslashes(htmlentities($userInput)). It gets inserted into my database. (NOT a mysql db) Is it sufficiently safe from xss? Thank you!
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188 views

OWASP Zap proxy Fuzz XSS pentest against REST API

I am looking to PEN test my application against XSS attacks. The application is a REST API... As such when you POST some JSON to /cart/add to see the result of that attack you would need to GET ...
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1answer
239 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 ...
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1answer
83 views

How can document.referrer be used for XSS?

A very simple example... <div id="cat"></div> <script> document.getElementById("cat").innerHTML = document.referrer; </script> or <script src="' + document.referrer + ...
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30 views

what is the scope of reflected Cross site scripting in the perspective of a hacker? [on hold]

I want to know what all dangers a hacker can perform by reflected XSS
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2answers
2k 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 ...
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1answer
39 views

Understanding cross origing requests from a web page

Reading up the XSS attacks on wiki I see that it says an injected script could send data/cookies to the attackers site. How is this achieved? Are there no checks/restrictions on cross origin requests ...
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3answers
2k views

How can I control the content of the HTTP HOST header in requests issued from my website?

Is anyone familiar with a way in which I can post a link on my website, that when accessed will cause users to issue an HTTP request to a 3rd party site with custom content in the HOST header ...
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1answer
424 views

What is mutation XSS (mXSS)?

I was unable to find any good documentation or anything on mXSS. Can anyone give some info or give a link? I found a video and a PDF of the video's presentation: ...
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2answers
338 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 = ...
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1answer
91 views

Interesting security demos for beginners [closed]

I am thinking about a creating short security demo to get people interested in the security topic. I've had a couple of ideas just want to see if anyone has anything else interesting. Edit: I was ...
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34 views

Possible cross site scripting vulnerability caused by url_with_protocol

I used pullreview to review my project. It came back with a security concern ( Possible cross site scripting vulnerability) on this line: link_to portfolio.website, ...
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1answer
71 views

“<” and “>” is filtered, is there any way bypass it? [closed]

I found that the characters; < and > are filtered (shown as: &lt; and &gt;), when I pen test for a website. Is there any methods to bypass < and >?
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1answer
84 views

What are the risks of accepting URL param for automatic redirection?

Can anybody name all the risks of the following scenario: User visits a page, but his session is expired, so he is auto-redirected to login page with his previous page and params added as a single ...
2
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1answer
45 views

encodeURIComponent in a unquoted HTML attribute

My gut feeling is that the following should be attackable: $("<td><a href=somefile.php?url="+encodeURIComponent(somevar)+">Download Here</a></td>"); In contrast to ...
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580 views

Does CSRF prevention also prevent reflected XSS attack?

What I understand about reflected XSS is ... When a web application is vulnerable to this type of attack, it will pass unvalidated input sent through requests back to the client... [1] ...
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3answers
327 views

Escaping rich text editor output

When having a rich text editor on a web application, what is the best way to escape HTML entities and prevent XSS attacks but keep the formatting (<b>, <i>, <u>, ...etc.) ?
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1answer
63 views

Testing XSS - how to validate manually?

I have Burp and Appscan telling me that Reflected XSS is possible due to a particular variable on a particular page. The following example is given of what Appscan injected ...
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4answers
545 views

What is a good browser for web application pen testing? [closed]

I am getting started in testing web applications, and I am having trouble verifying vulnerabilities. It seems all modern browsers have protections against things like XSS. When something like Burp ...
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31 views

securing my API: concept of accesstokens

first of all I want to excuse for the bad spelling and grammar. English is not my mothertongue. I have built a JSON communication between frontend(website) and my NodeJS webserver. I want to keep in ...
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45 views

DOM based XSS manual testing

How can firebug be used to inspect DOM of web application and find the vulerable location for DOM xss?
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2answers
176 views

Is there a need to have XSS filters when I'm saving data as XML?

My web-app takes some configs from the user and saves into an XML file (it was not done to stop XSS). The input is XML encoded so that the ",& ... and such characters don't break the XML ...
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2answers
120 views

XSS in HOST header

I'm able to inject JavaScript payload in HOST header, a request will look like: Host: <script>alert(document.cookie)</script> User-Agent: Mozilla/5.0 Gecko/20100101 Firefox/29.0 Cookie ...
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1answer
47 views

Is PHP FILTER_VALIDATE_IP secure enough to $_GET an IP address?

I need to pass an IP to a PHP page, and it would be convenient to be able to use GET, but I know that's sort of asking for trouble, so I want to triple-check that I'm handling it securely. ...
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1answer
65 views

XSS echoed in pages html code but no pop up window

So i have a https login page with standard username and password inputs. I put in simple xss test such as, alert(‘XSS attack’) the page displays a "credentials you have supplied are incorrect" ...
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49 views

Can location.pathname lead to XSS?

<div id="cat"></div> <script> $("#cat").html(location.pathname); </script> I think that example would work, but anyway, if location.pathname has to be a valid page, can this ...
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64 views

Flash cookie and man-in-the-middle

I am using the Scala Play web framework. In it, there is a PLAY_FLASH cookie used to flash messages to the user (it's a cookie so it will still work after several redirects). I put HTML in the cookie ...
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49 views

<,>,/ etc symbols are getting escaped while trying for xss,anyother alternatives for these symbols to carry out the attack successfully?

Symbols like >, <, / etc are getting escaped any alternative to carry out the xss attack ? most of the websites are having xss filters
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117 views

What is Reflected XSS?

Fed up with the following definition. Reflected attacks are those where the injected script is reflected off the web server, such as in an error message, search result, or any other response that ...
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1answer
86 views

can Veracode be taught to accept mitigations that it does not yet recognize

Veracode (http://www.veracode.com/) has certain parameter encoding libraries that it trusts. Others are labeled as flaws. If I'm satisfied with another method of parameter encoding that is meant to ...
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2answers
104 views

Security issues in “Remember Me” function code example

I'm a beginner, and these may be very obvious for you, but I'm trying to understand if there are security issues with this example. Today on Stack Overflow, I saw the following post: PHP Sessions ...
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2answers
64 views

How the address bar manage the XSS?

I was playing with OWASP Mutillidae II and in one page I've found one vulnerability. In the address bar I've wrote something like : ...
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2answers
137 views

Exploiting XSS with window.name without iFrame

I know XSS is possible if the window.name is echoed onto the page, but from my understanding, this requires you to use an iFrame, but what if the page has clickjacking protection, stopping the page ...
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1answer
72 views

Could I XSS a page that filters &,",< and > characters and has Content-Type set to UTF-8?

I am trying to pentest a dummy website that has a form with a TEXTAREA input on one page. When the form is submitted, the contents of the form are displayed on a second page. However, the second page ...
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1answer
473 views

XSS Technique - & JavaScript Include

I was looking through the OWASP XSS Filter Evasion Cheat Sheet, and there was one technique that was completely new to me: & JavaScript includes <BR SIZE="&{alert('XSS')}"> I ...
4
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2answers
6k views

DOM Based XSS attacks: what is the most dangerous example?

I knew that XSS attacks (“non-persistent” and “persistent”) can hijack user session, deface websites, conduct phishing attack, etc. However, I can't understand what is dangerous of DOM Based XSS if ...
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58 views

Session Fixation - Setting path to root without /

I have found an XSS vulnerability on the subdomain of a site I am testing, and using it I can set cookies for both the main site and all it's subdomains. My url currently looks like this: ...
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1answer
36 views

XSS attack remediation in older technologies

My application is vulnerable to XSS attack. Technology used in the application are Servlet 2.2, JSP 1.1, Jdk 1.3, WAS 4.0. I wanted to remediate XSS vulnerability with migration of technology or ...
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1answer
53 views

Flash Objects SWF security (ExternalInterface.call)

I am performing a penetration test against a website that uses Flash. I found this piece of code: url = ExternalInterface.call("window.document.location.href.toString") as String; How it can be ...
4
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3answers
121 views

What can we do with non persistent XSS vulnerabilities?

Sorry for this stupid question but i'm thinking about what an attacker can do with a non persistent XSS attack on a website? An attacker can try to phish me with a malicious url, steal my cookies or ...
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85 views

Content sniffing XSS attack?

As a part of work, I've come across content sniffing, and i understand web apps can be vulnerable to xss because of it. There is another post, regarding content sniffing and xss, but didnt quite ...
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73 views

An XSS attack is working on Firefox but not on Chrome..Suggest changes to make it work on Chrome

I am able to inject this: http://domain.com/search/songs/<img src='alert(document.cookie)' onerror='alert(document.cookie)'> to the page HTML. The onerror event is giving me the cookie on my ...