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.

learn more… | top users | synonyms

7
votes
1answer
5k views

Iframe javascript Keylogger

Is it possible for a website to have a javascript keylogger and also contain an iframe that goes to a "client" site. Can the the JS log all key strokes done on the client site? Can the (host) iframe ...
7
votes
4answers
287 views

Limited JavaScript app scenario: Attack vectors and mitigation

I'm going to be developing a single page JavaScript app which allows input via a textarea. This input is never sent to the server, never shown to another user, and will only be persisted in browser ...
9
votes
5answers
4k views

How to validate if a JavaScript library is secure?

I'm the main developer for an Open Source JavaScript library. That library is used in the company I work for, for several clients. Every now and then there is a client that feels paranoid about ...
9
votes
2answers
625 views

User-specific Subdomains : JavaScript security

If I provide a public-facing website for users on my website at their own subdomain (e.g. bob.myapp.com) under their own control, can I allow them to execute arbitrary JavaScript without putting my ...
-1
votes
4answers
178 views

How secure is this login page? [closed]

Unfortunately I cant link to the page (it internal). But I can describe it! This is a lightspeed systems policy enforcement login page (content filter). The page is http and there is no iframe with ...
5
votes
3answers
5k views

Javascript Malware: How does it work, and how can it be mitigated?

I am wondering how malware gets served through Javascript. I've noticed a few illegitimate pop-ups while visiting some financial websites. I wonder how malware exploits work against the application ...
2
votes
1answer
2k views

How to prevent the following clickjacking attack?

The Security attribute was implemented to prevent XSS attacks in iFrames by disabling any JS implemented in the iFrame source, therefore indeed eliminating XSS attacks, but also disabling any security ...
14
votes
4answers
5k views

Generate cryptographically strong pseudorandom numbers in Javascript?

Is there any good way to generate cryptographically strong pseudorandom (or true random) numbers in Javascript? The crucial requirement: if a.com's Javascript generates some random numbers, no one ...
3
votes
2answers
547 views

Implementing brute force attacks on hash values in Javascript

I'm working for my bachelor thesis at the end of which I aim to implement a proof-of-concept Javascript-based hash cracker. The idea is to work like this: Users can submit a hash value along with ...
47
votes
3answers
27k views

Securing a JavaScript Single Page App with RESTful backend

I'm currently in the process of building a JavaScript SPA and have been researching how to secure it. There is currently as RESTful API that is being completely interacted with through AJAX. We also ...
8
votes
5answers
339 views

Is it a risk to highlight text while reading a webpage?

Whenever a user selects or highlights text on a webpage, an OnClick() event is generated. Some of the web browser security models depends on explicit end user interaction, such as OnClick(), before a ...
0
votes
1answer
686 views

scanning my site for JavaScript/XSS vulnerabilities [closed]

It have had a report that my site may have a security issue and there is some JavaScript loading 10 times per second. www.ayrshireminis.com Is there anyway that I can "scan" my site to check if ...
1
vote
0answers
166 views

What are potential use cases of script that identifies browser? [closed]

Let's say I've found a way to produce a unique string for each and every browser using pure Javascript (which makes it an alternative to UA strings). Now what I'd like to know is what are potential ...
3
votes
5answers
1k views

Is it secure to use jQuery on the server-side for user input validation?

I'm thinking about using jQuery on the server-side (node.js) to validate user input (filter tags, remove every attributes except href, rel, target & style, modify css rules which are applied ...
3
votes
2answers
579 views

Why do I get AV alerts when browsing a web page?

I'm using the latest version of Firefox and Windows is up to date. When I was browsing a webpage and clicked a link the browser displayed "connection has been reset" and AVAST poped-up saying "Alert!" ...
3
votes
1answer
255 views

Client-side cross-site access in SSL environment - when it's still possible to do?

I'm trying to imagine an secure sandboxed environment for an application which is big and unexplored, and may contain backdoors. It would live under chroot/virtual environment with no outgoing ...
1
vote
2answers
192 views

Why ban XSS instead of flagging it?

Consider a browser that allows an XMLHttpRequest downloaded from foo.net to make requests to bar.net, but attaches a XHR-Origin: http://foo.net (or possibly a more descriptive value like ...
1
vote
1answer
100 views

How to verify that a clientside-generated object is genuine?

I know that general best-practice states not to trust anything generated by the client. With that in mind, I want to write an HTML5 app that utilises the browser to generate various objects ...
1
vote
1answer
7k views

Encrypting string in javascript and decryption in java

I would like to know if someone know any library to do encryption in javascript and decryption in java. I have already tried many API, But getting not not getting same values in java. I want ...
1
vote
4answers
2k views

Shall I need to use MD5 algorithm in both JavaScript and PHP for login authentication?

I have a login form with username and password. I post this form data to a PHP file. For security reasons I want to encrypt my password in the database and network. Now I have done now following ...
9
votes
3answers
6k views

How can i find what hashing algorithm was used?

One of my clients has asked me to modify the login page that their board members use to access their materials. The problem here is that the person previously responsible for this has left no ...
11
votes
4answers
3k views

Challenging challenge: client-side password hashing and server-side password verification

We have a website where users need to log in to access privileged information. Obviously we are using SSL, but I also want to avoid plaintext passwords from accidently ending up in server logs, or ...
-1
votes
1answer
223 views

Why don't G+, Facebook and Twitter use text editors to share? Why would someone receive each separately? [closed]

I've seen sites use text editors as below: What is the risk in using these? G+ receives images individually, others receive it all at once. Could someone shed some light on it?
3
votes
2answers
246 views

How to defend against invalid UTF7/8 that hides a <script> tag?

I'm scanning HTML before it reaches a browser, and I've just heard about a type of exploit that uses invalid UTF7 or UTF8 sequences to embed an otherwise invisible script tag, which is used to execute ...
4
votes
2answers
448 views

Are sandboxes overrated?

I've stumbled upon the following on the blog of the NoScript developer Giorgio Maone. First, he quotes the following ArsTechnica article about an XSS bug in Adobe Flash: As useful as sandboxes ...
1
vote
3answers
467 views

Client side scripts through proxies

If you're trying to hide your IP address using VPN/proxies can a website using client side scripting record your real ip? If yes is there any alternative to blocking all scripts as that breaks ...
2
votes
1answer
363 views

Is DWR (Direct Web Remoting) Secure?

Is DWR considered secure, or what may be required to secure Direct Web Remoting? Are there better options for hardened asynchronous communication?
1
vote
1answer
180 views

Is the javascript browser tool at printfriendly.com secure for my browser

I use Win Xp Home with SP3 and am pretty aware of security problems. I use Palemoon 12.1, a version of Firefox optimized for windows. I usually use printfriendly bookmarklet to create printable pages ...
2
votes
3answers
403 views

sanitizing likes/unlikes in application?

I've got a function in my app where users can click on a "thumbs up" image and a like is recorded in the database; all that's recorded is the user's ID and the ID of the post that the user liked. I ...
4
votes
5answers
1k views

Clicked on fake “Download Now!” ad on file transfer site (legal file for legit purposes) by accident; does anyone know what measures I should take?

I was sent a file by a coworker via "sendshare" - my first time using the service. The page loaded a bit slowly and the ads came in before the actual download link. I was in a hurry to get the file - ...
2
votes
1answer
2k views

javascript:alert(“test”); command does not work

Hello! As I have done before and also have read in many web sites, that just simply writing: javascript:alert(document.cookie); should work on any web page. But now, I was not able to execute it. I ...
1
vote
4answers
2k views

Prevent Users from Downloading Javascript, Images

A lot of times I see that resource XXXXX.gif or XXXXX.js can't be saved when I try to save a webpage in Firefox. So this made me think, can I implement a similar thing for my website as well? ...
0
votes
3answers
5k views

Set Cookie in XHR response : How different browsers handle this?

If I send a XHR request to example.com and response has Set-Cookie: dummyCookie=dummy in response. How different browsers handle this? Does any version of any browser set the cookie for ...
1
vote
2answers
554 views

AVG Website Scan, Chance of 'Potential Threat'?

In a recent question I asked about investigating websites for viruses. The answers were very helpful, I ended up using the AVG website scanner. First I used it on our website and found it was clean, ...
2
votes
2answers
10k views

Best Approach for removing XSS Vulnerability

I have been developing a Webobjects application, and I found that my application is vulnerable to XSS through URL, but not when malicious input like <script>alert("hi")</script> is input ...
10
votes
4answers
7k views

Is WebGL a security concern?

Is WebGL a potential security problem due to the low level access it provides? For example, a web page can attempt to compile and run any shader source it wants. It seems that security would ...
2
votes
4answers
2k views

Without using SSL, what's the most secure way to make an AJAX request to a PHP page?

It was suggested over at stackoverflow that I try my question here. This is it verbatim: So, it's impossible to do AJAX requests securely without using SSL. I get it. You can either view-source the ...
1
vote
0answers
612 views

A proposal for Data Transmission and Password Encryption [closed]

I need to implement a sensitive data protection scheme which can meet the requirements on secure data transmission, protection and storage, assuming mutually trusted third party is not available, that ...
2
votes
2answers
968 views

Removing Google Analytics cookie string from URL - security hole?

On our site, we use google analytics and we have to put the GA cookie in the URL since we have a two letter domain and IE imposes some cookie limitations on those. This means that when going between ...
1
vote
3answers
1k views

what's the absolute worst damage javascript could do to a client?

Assuming I have a defenseless client computer running Windows 7 that will happily allow any javascript code it comes across on the internet, what's the worst damage that could be inflicted? I'm ...
3
votes
2answers
733 views

HTML Vulnerabilities

My question is three-fold. Background I was asked to do some vulnerability scans on a website with some holes (I think). On a particular page, I was able to escape the text field and write on the ...
7
votes
2answers
17k views

Javascript and jQuery not secure over https

I am building an ASP.NET MVC 3 app which will run in Azure. Everything was working well, until I switched to https. Now most of my jQuery plugins and some other javascript are not secure. I'm using ...
5
votes
1answer
4k views

Is this jQuery ajax call vulnerable to XSS?

If somebody can edit $("#field").val(), can they change the url property here to point to another location? $.ajax({ url: "http://mywebsite/script?param=" + $("#field").val(), dataType: "jsonp", ...
4
votes
2answers
553 views

Can one get infected through visiting a site with a PHP script on it and if yes, how?

I can imagine a clientside JavaScript that gets executed in a vulnerable browser to do some harm, but how can this be done with PHP? Since it's serverside it shouldn't have access to the visitor's ...
6
votes
3answers
938 views

How secure are self decrypting HTML files for data storage?

I recently came across a JavaScript self decrypting archive. Is it secure enough to be used as a portable password storage tool? The author has even challenged it to be cracked.
8
votes
3answers
2k views

How bad is a Self Contained XSS attack?

Some of you might be familiar with this attack called Self Contained XSS. I recently stumbled upon this article about it. So how bad this kind of attack can be, even though this doesn't have access to ...
15
votes
1answer
2k views

Best way to secure javascript front end/REST back end architecture web site?

I would like to build the following project: public REST API back end which can be accessed by any authenticated client. front end with static files in HTML/CSS/Javascript with Backbone.js jQuery ...
13
votes
6answers
9k views

How to scan Javascript for malicious code?

We're planning to give the possibility to write community-driven extensions in javascript for our public webapp and let people to customize their instances of the application. The problem is to ...
9
votes
5answers
2k views

Mobile Carrier Javascript Injection

So it appears that T-Mobile in the UK are injecting a javascript file into the head of files that are transfered over their mobile data network. The file in question is 1.2.3.8/bmi-int-js/bmi.js ...
9
votes
3answers
1k views

localStorage for apps over https. What expectations are there?

I run an online gradebook. To keep student data private, I transfer all data over https. Now, I'd like to use localStorage to avoid redundant calculations and server requests. However, according to ...