The common name for the language used primarily for scripting in web browsers. It is not related to the Java language. Standardized as ECMAScript, its dialects/implementations include JavaScript and JScript.

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Cross Domain Javascript security [duplicate]

I used a web vulnerability scanner to scan my web site. It indicates several links with "Cross domain Java script source file inclusion." May I know how would an attacker exploit this type of ...
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186 views

Best practices to invalidate JWT while changing passwords and logout in node.js?

I would like to know the best practices to invalidate JWT without hitting db while changing password/logout. I have the idea below to handle above 2 cases by hitting the user database. 1.Incase of ...
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2answers
76 views

Limiting latter dom-based XSS when setting document.title

Given some JavaScript which modifies the page's title by taking in variable data document.title = someVariable I am looking to address dom based XSS while keeping the title fairly readable. ...
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1answer
94 views

Securely identify clients by web app

I have a web service S that provides certain services. There are two web apps, A1 and A2, both on different servers within the same VPN, which I trust and want to grant access to my web service. ...
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1answer
37 views

Secure keyboard entry with JavaScript or Flash?

Is it possible to perform secure keyboard entry (similar to what is offered in the OS X Terminal app) using only web technologies and/or Flash? If not, is there any way to more broadly guarantee ...
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1answer
88 views

How can I secure my server to ensure pre-login calls are originating from my app?

I have a .NET Web Api servicing a Cordova based mobile app and web front end written in AngularJS. I have done a ton of research and most sources don't give a great answer or one that's huge overkill ...
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2answers
120 views

XSS outside of the DOM

I have the following JS (using jQuery for brevity's sake but it isn't necessary for the question): $("<i></i>").html(userInput); Is it possible for someone to input some string, ...
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1answer
53 views

From a security perspective, why not a screenshot api for browser? [closed]

I mean a javascript api for capturing a renderered html page, or current viewport, and dump content onto an image. While there are obvious attacks, such as taking screenshot of sensitive information, ...
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2answers
2k views

How do the Stack Exchange sites protect themselves from XSS? [duplicate]

It seems to me that because Users can post questions and comments in them with HTML markup (possibly <script> tags), Stack Exchange sites would be very exposed to XSS attacks. How do they ...
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2answers
257 views

Website infected with unwanted “redirections”, apparently via javascript code

I'm working on a clients website, and I realize they've been compromised. Early today there was a major problem with a php eval(base64_decode issue. That was cleaned up via Andy Stratton clean.php ...
3
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1answer
177 views

How does the same-origin policy apply between browser tabs? [duplicate]

Let's assume that we have 2 open tabs in a browser containing page A (A.html, A.js) into the first tab and page B (B.html, B.js) into the second tab and that page A and B have the same origin (scheme, ...
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1answer
174 views

Encrypted quiz data in PHP and JS

I'm developing a quiz with which you can win a few cool prizes. Therefore I'm afraid, that someone might try to hack/manipulate it. All participants have to be logged in and the website takes 15 ...
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2answers
164 views

High level design for secure web application

I'm looking for some advise on designing a secure web app for storing passwords. Why reinvent the wheel? Because I don't trust a 3rd party with all of my passwords. Here are my thoughts: There are ...
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1answer
206 views

How is the QSS tag used as payload in an XSS attack?

I have received a report from a client that lists XSS vulnerabilities. The report shows reflected XSS vulnerabilities. In each vulnerability, the payload reflected is a single, unclosed <qss> ...
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1answer
1k views

Preventing socket.join(“room”) client-side, listening for private room leaving

i'm developing an application with Socket.IO that needs to authenticate if user can join a room. Client side: var socket = io('http://<?php echo $_SERVER['HTTP_HOST'];?>:3000'); ...
3
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2answers
142 views

Security of Firefox extensions such as Mailvelope

I am asking these question because I am not very familiar with javascript or the Firefox plugin/extension system. The specific context is the Mailvelope pgp extension but the questions are general and ...
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1answer
56 views

Spoofing of Server Sent Events

In the spec for Server Sent Events, it says Authors should check the origin attribute to ensure that messages are only accepted from domains that they expect to receive messages from. Otherwise, ...
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2answers
152 views

Is JavaScript console vulnerable to XSS

Assume the content of the name variable below is controlled by an attacker. Is this line of code vulnerable to XSS? console.log(name) When I send an injection in name variable I see its value ...
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1answer
208 views

Suspecious js file sent as email attachment

I received a js file with following code in my spam folder but I decided to take a look into the file. Do anybody of you know what does this code might do? var evl='';function nr() { evl = '}; ' + ...
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1answer
334 views

Exploit SoakSoak injected in Wordpress

I have recently received an attack to my website and Google is warning visitors to not load the page. The malware is located in wp-includes/js/swfobject.js of my Wordpress and I had deleted it but ...
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1answer
96 views

Should I be worried about this url request I received on my site?

I was checking the weekend logs of my IIS server and noticed a strange request which was blocked: ...
49
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6answers
5k views

Does injecting querystring values directly into HTML pose a security risk?

Someone reported a bug on my site that I don't really consider an issue. My site has an URL akin to this: www.site.com/ajax/ads.asp?callback=[text injection] So filetype is application/json, and I ...
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2answers
116 views

How can this web server be compromised?

A linux server has Node.js installed with the http-server package. The server will respond to requests on port 80 with a file in the same directory named index.html. An interesting characteristic of ...
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1answer
255 views

Verify CDN javascript's integrity

CDNs speed up the loading of websites by allowing caching for frequently used javascript libraries like jquery. How do we know if they have modified the javascript before serving it to my clients? ...
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3answers
139 views

What's the best way to secure the responses in a single page web app after logout?

I've read some of the great responses to storing and passing session keys in a single page web application (i.e., a web "site" that runs mostly on the client-side, getting data from the server by ...
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2answers
158 views

is it sufficient to convert '(single-quote) to ` &#039; `

Is it sufficient to convert ' to &#039; , > converted to &gt; and < converted to &lt; to avoid xss A bit of context: the payload would be going through the URL and landing in a ...
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2answers
168 views

Attack using weird characters followed by some javascript in a URL?

I'm seeing a very weird attack this morning from a pile of VPS instances spread out across the US. The URLs look like this: /js/bundles/,!0):this.element.propAttr( ...
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5answers
1k views

Is converting `<` to `&lt;` sufficient to prevent execution of JavaScript from arbitrary HTML?

This is kind of a bar-bet question. An acquaintance of mine has made the claim that, given an arbitrary glob of HTML, it can be completely prevented from executing JavaScript if, before slapping it ...
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2answers
3k views

Can JavaScript be used to capture the user's screen?

Can JavaScript be used to capture the user’s screen? If so, is this functionality available in any JS framework? (I do not need code examples: I am mainly asking to form an opinion about the security ...
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2answers
773 views

What's the best way to authenticate an user using a websocket?

I'm creating a multiplayer game(based in websockets) which runs directly from the browser and which has multiplayer functionality. Each player needs to have his own account(Username and password). ...
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1answer
277 views

What are the security risks associated with PDF files?

What are the security risks associated with PDF files? There is, of course, the general risk associated with any type of file: that whatever application is used to read it will have a bug that can be ...
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2answers
2k views

Cordova/Phonegap: RefreshToken in localstorage

I am (partly) following a tutorial to develop a cordova app, based on angularJS. The author stores the refresh token in local storage, which was said to be very bad practice in one of the comments on ...
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4answers
1k views

bot detection via browser fingerprinting

I've recently noticed that a few companies have begun to offer bot and scraping protection services based on the idea of browser fingerprinting to detect them, and then blocking the specific ...
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1answer
144 views

Is it dangerous to allow clients to run JavaScript on a Server

On a webpage I have been working on, we can archive certain webpages for a user. The user can give an address and this webpage is than visited on the server and archived. Lately, I noticed that ...
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2answers
80 views

Why browsers implement stricter policy for local files

I have a problem viewing HTML/JS/CSS files generated on disk. Specifically, several calls in javascript are blocked by Google Chrome. I googled and found an answer here: ...
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1answer
87 views

What are the major threats involved in storing the session identifiers in local storage instead of cookies?

I want to know the major security threats involved in storing the session variables in client side local storage, instead of storing it in the cookies. Can somebody give me a brief description?
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1answer
56 views

Javascript file detection

One common technique I use is xor bruteforcing on binary data. In this case, I would like a heuristic approach to determine whether or not any possible candidate plaintexts are javascript. This rules ...
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1answer
365 views

extracting JSESSIONID from document.cookie

I was trying cookie stealing on a java and spring based web application. Normally, a cookie can be obtained through <script>alert(document.cookie)</script>, but in the above code, cookie ...
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1answer
82 views

Is it any more secure to use a HTML form instead of a javascript popup?

Assuming both use session authentication, token validation and forced https: Is there any difference in security between submitting data via a JS popup <> ajax endpoint, and a standard web page ...
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1answer
194 views

Malicious JavaScript — Troj/JSRedir — Gumblar

I have a client with a website receiving AV warnings from Microsoft Security Essentials. A further investigation revealed that the site is blacklisted by Yandex.com, due to a report that the site ...
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4answers
2k views

My ISP is injecting strange codes to every website I visit

Here's the code at the bottom of every page: <script type="text/javascript">if(self==top){var idc_glo_url = (location.protocol=="https:" ? "https://" : "http://");var idc_glo_r = ...
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1answer
70 views

Unlock codes for a mobile app

This is for an Android (via Cordova/Phonegap) game project. My goal is to be able to provide a "promo code" that will allow anyone to unlock the game for free, but I want to limit each code to only ...
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2answers
129 views

Do browser add-ons increase security risk due to possible vulnerabilities

A large amount of people use add-ons such as NoScript or AdBlock to avoid exploitation by malicious JavaScript from advertisments. This decreases the risk of becoming the victim of web-exploits. But ...
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2answers
94 views

Detect Different Machine using Browser [closed]

Some web apps like Facebook and Gmail detect the first time we try to login from a device. Assuming that a browser can't read machine name, and MAC ADDRESS. What kind of variables are they collecting ...
8
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4answers
682 views

Session Hijacked in case javascript blocked [closed]

If I blocked Javascript to be executed. Then what are the ways by which XSS can occur and what are possible threats in case of intranet application.
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1answer
117 views

Techniques for bypassing zero length check in javascript?

I am working on a node.js application that allows users to sign up for accounts using social media. When they do this an entry is created in our database with their email address, and a blank ...
2
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1answer
123 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
201 views

If CORS is set to * your browser can't read the response if cookies are sent over. Why is the wildcard considered insecure? [duplicate]

If this header is set Access-Control-Allow-Origin: * javascript can make a request to the domain and read the response if and only if no cookies are sent over, otherwise the javascript cannot read ...
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3answers
7k views

What does this javascript file do? Is this a virus?

While searching on Google I found a website that shows one set of content to the Google Bot and an other to users (by redirecting to a new domain), and also a very suspicious Javascript file. Maybe ...
2
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1answer
411 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 ...