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 Site Script Inclusion

I have the following javascript code that includes a sensitive token (token=sensitive_information): (function() { var u = document.location.href.replace(/http:\/\//, ''); var sb = ...
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1answer
22 views

What are the best practices for (token based) security in a webapp?

I am designing a web application using Spring MVC with REST controllers and Angular JS pages which communicate with these REST controllers. I've implemented a token based security/ authorization ...
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3answers
77 views

Can a browser JavaScript console ever be an issue?

I'm sure most of you are familiar with the JavaScript-based game Candy Box. As you probably know, one can cheat this game's candy system by sending commands to the console. For instance, if you ...
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0answers
72 views

How does JavaScript Injection work?

I was watching a DefCon talk and the speaker was saying he was able to infect JavaScript cache files, once the user visited his website/server. From there he was able to load scripts from other sites ...
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1answer
7k views

Encrypting string in JavaScript and decryption in Java [on hold]

I would like to know if there is any library to do encryption in JavaScript and decryption in Java. I have already tried many APIs, but am not getting the same values in Java. I want public-private ...
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1answer
25 views

Angular security in $scope

For our app when a user logged in we are issuing him a token which is stored in session and we are using $rootScope to store his details. This what we are doing if(sessionStorage.loggedIn && ...
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3answers
82 views

Temporary XSS Vulnerability

I found xss on a textarea field. When you enter a character to this field it output the character on realtime so when i input the following code: <input onclick=alert(document.cookie)> there ...
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2answers
37 views

Is is possible to create a “signature” for a piece of JavaScript

Bear with me, I may have asked this question in a botched way. So I need some JavaScript code that creates a signature of JavaScript that is stored in a string. Here is an example: presignature = ...
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3answers
548 views

What are NoScript surrogates and should one disable them for more privacy in browsing?

NoScript has a feature of supplying its own "surrogate" scripts instead of well-known tracking/ad scripts (Google Analytics, for one). Does it matter for my privacy if I do not change the factory ...
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2answers
323 views

Would usage of jCryption 3.0 + SSL have mitigated the Heartbleed vulnerability?

I came across a project called jCryption 3.0, which encrypts data between the client and server, without using SSL. If a website's JavaScript had used jCryption 3.0 to encrypt login form fields before ...
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1answer
39 views

Could blocking script in the url prevent DOM XSS? [closed]

On my site, if I were to block <script> from the url, could this prevent some cases of XSS? Any way someone could bypass that?
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1answer
31 views

Safe to render data directly to DOM from localStorage? XSS attack possible?

I read that localstorage is susceptible to XSS attacks. I currently store JSON Web Token (JWT) in localstorage, and I access and display data about the user through localstorage: var localstore = ...
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1answer
939 views

How to secure my REST implementation for an ember.js app

I've been searching and searching for what seems days and have not come up with any definitive answer on a solution to my problem. To explain without going into terrible detail I am building a store, ...
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1answer
86 views

What to do if I suspect a website I visit and link to was compromised via an XSS?

EDIT: The script has been removed and apparently the vulnerability has been patched. My employer links to this resource: http://www.myplan.com/ I recently noticed a JavaScript alert was added into ...
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3answers
434 views

Favicon Redirection Possible Security Flaw

I have the domain example.com When I enter the URL https://api.example.com, Chrome loads the page and also tries to load https://myapp.example.com/favicon.ico, and that request receives a 301 ...
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1answer
59 views

JS code giving xss vulnerability

Below is a piece of JS code: if(!(window.location.href.indexOf('?')> -1)){ id= window.location.href.slice(window.location.href.lastIndexOf('/') + 1); } ...
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40 views

Problem in 'underscore.js' “new Function()” when CSP header is set.

In underscore.js, template rendering causes violation of the 'unsafe-eval' property, with CSP error at following line: "render = new Function(settings.variable || 'obj', '_', source);" The solution ...
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28 views

Securing REST API with HMAC and SPA

I'm developing a JS based SPA and the backend is a rest api which uses HMAC. The site/app doesn't have the concept of registered users but it has the concept of session. How do i make sure that the ...
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2answers
367 views

Set the max length for input

Suppose I have a form, and one of this form inputs I set the max length to 15: <input type="text" name="username" maxlength="15"> Now the attacker wants to override this limit, to do that he ...
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3answers
119 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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1answer
219 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 ...
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1answer
78 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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2answers
145 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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1answer
8k views

Create RSA public, private key pair having numbers generated already

I want to know to to generate working RSA key pair, with correct syntax. Let's say i have already generated somehow my numbers for 512bit key, which are: e = 00065537 d = ...
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3answers
63 views

External JS Security

I'm kinda new to security development. I've work mostly with backend processing stuff. I've been assign on how to secure external javascript that we import from facebook, twitter and google. One ...
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1answer
61 views

XSS inside a javascript

Can an XSS be craft inside the following JS. $(function () { $("#panel").find(".form").each(function (index) { var that = this; $(that).overload(); ...
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1answer
57 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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4answers
19k views

How do you know your server has been compromised?

I recently helped a client who had their server hacked. The hackers added some PHP code into the header of the homepage redirecting the user to a porn website — but only if they came from Google. This ...
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2answers
122 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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2answers
12k 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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0answers
49 views

ASP.NET WCF security, javascript and handling sensitive information

I've come upon what I would call some "nasty" javascript coding (I come from a KnockoutJS / Angular / Web API 'world') in which WCF services are exposed to javascript by production URL's, i.e. ...
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0answers
63 views

Can source javascript files be infected from a developer's machine?

First a little bit of background, About two weeks back one of the developers in my team said they were seeing advertisement popups and links appearing all over the web app we were developing, when ...
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4answers
896 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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2answers
91 views

Is Great Cannon essentially a JavaScript injection attack?

I was reading an article on Great Cannon at Ars Technica (http://arstechnica.com/security/2015/04/meet-great-cannon-the-man-in-the-middle-weapon-china-used-on-github/) and it seems to me that this is ...
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1answer
172 views

What does this malicious JavaScript code do? [closed]

I got this by email this morning before my brain woke up and I clicked on it. Does anyone know how bad this is? It gave me an out of stack space error when I ran it. var ...
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1answer
78 views

Potential attack vectors using Javascript to log in [closed]

I would like to allow users of a website to be able to log in at any page. In order to provide a seamless experience my first thought was to collect user credentials (username and password) in a ...
3
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4answers
4k views

How to stop other websites from sending cross domain AJAX requests?

From two different applications, I was able to send cross-orgin requests. Though the browser returns a "cross origin" error my server is still receiving and executing the request. For example, from a ...
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0answers
50 views

Securing a JavaScript app with RESTful backend

I went through the question Securing a JavaScript Single Page App with RESTful backend that has discussions / options around securing a Javascript client side app that invokes RESTful APIs. However, ...
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2answers
111 views

Are “web bugs” a technique that instructs web browsers to operate the computer's microphone?

"Web bugs" [pg 7] refers to Javascript techniques that instruct web browsers to operate the computer’s microphone and locally search the audio for keywords. Would this be false? If so, why?
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2answers
61 views

Classifying Reflected and DOM-based XSS

Having referenced Difference between DOM & Reflected XSS , I observed that certain attacks could be both DOM-based and Reflected XSS. I wish to find out if my understand is accurate, or they ...
3
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1answer
73 views

What's the advantage of passing credit cards via javascript vs. over the server (without saving it)?

I've noticed current credit card gateways like stripe and wepay encourage sending the credit card number via their js framework (which would use some iframe jsonp magic to pass the data). To my ...
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2answers
90 views

How do anti-viruses identify malicious pages when JavaScript doesn't have access to the filesystem anyway?

Disclaimer : I am not very knowledgeable about the behaviour of anti-viruses (anti-viri?). I was wondering how they discern between malicious and non-malicious pages if all they can read is the HTML ...
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1answer
160 views

Malicious JavaScript warning [closed]

I visited a site yesterday and received no malicious javascript warnngs. Today I visited that same site and got the warnings. Do I need to be worried about being infected with something?
3
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1answer
107 views

Predicting Math.random() numbers?

I was reading up on the documentation for Math.random() and I found the note: Math.random() does not provide cryptographically secure random numbers. Do not use them for anything related to ...
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2answers
3k views

Does browser 'view-source' mode avoid scripting attacks?

Let's say there's a URL www.badjs.com which is untrusted and may contain bad scripts. Intuitively, a view-source navigation to that URL does not execute any scripts so it should be safe. It would at ...
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2answers
45 views

Is it safe to log JavaScript exceptions to the error console?

I know that on the server side it's very bad to display system-level errors instead of logging them to disk, because it could expose potentially sensitive information, but do the same concerns apply ...
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1answer
117 views

Is there any security benefit in stripping only `<script>` tags that contain code?

On a client's corporate network something is stripping all <script> elements that contain code, i.e. things like <script type="text/javascript">do_something();</script> will simply ...
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6answers
6k views

Preventing information disclosure from browser back button/history?

I have sensitive data that will be hosted on a website, and I would like to prevent the data from being exposed in this scenario: The primary user logs off the application, but does not close the ...
3
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1answer
141 views

How can I successfully perform an xss attack on a dummy website? [closed]

in my security course, we were told to practice an xss attack using firefox on this website; http://permalink.co/ No worries, this is a website specifically setup for us to practice ...
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4answers
473 views

What are JS malware attack techniques?

Malicious JavaScript (generated by malicious hosted PHP code for example) can lead to attacks. What are the types of attack that malicious javascript could perform? Are the drive-by download attacks ...