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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2answers
2k views

Is it possible to create a secure chat web application relying on HTML5 web sockets?

Is it possible to create a secure chat web application using just HTML5 and Javascript? What possible security holes would there be if the server doesn't store the messages, just relay them using ...
5
votes
3answers
521 views

Are CSRF Attacks Really Blind

I'm new to CSRF attacks but don't see how they are always blind. Let's say we are dealing with a site where the asset we need to protect is the HTTP response. Something like one's medical history. ...
4
votes
2answers
762 views

Safety of using web based proxy?

Lets say for example I have to use a public online proxy like https://www.zend2.com to load a PHP webpage controlled by me containing sensitive data over HTTPS. How would I make sure that the proxy ...
3
votes
2answers
158 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
votes
3answers
114 views

Temporary XSS Vulnerability

I found xss on a textarea field. When you enter a character to this field it output the character in real time so when I input the following code: <input onclick=alert(document.cookie)> there ...
3
votes
4answers
2k views

How to prevent attacks against client side validations?

I have a login form where am accepting Mobile Number of the User for login. When Mobile Number is submitted, am calling a JavaScript to validate the Mobile Number. My client side validations ...
3
votes
1answer
438 views

How can I use certificates to secure my webservices? What is available to javascript?

I have a few web services that are accessed over public wifi connections and I think it would be a good idea to issue certificates to encrypt data, prevent MITM, and invalid impersonation (beyond what ...
3
votes
5answers
2k 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 ...
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votes
1answer
548 views

How to decrypt javascript code extracted from PDF

I analyzed PDF, and extract javascript code. But javascript code is encrypted. I can't decrypt it. Please advise me. javascript code ...
19
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3answers
3k views

What are the risks of using a CDN to speed up my website? How do I avoid them?

Content Delivery Networks (CDNs) are well known to speed up the performance of a website, but they create the obvious security risks if someone were to change the code that resides on the CDN. What ...
6
votes
5answers
8k views

Obfuscating JavaScript code

Some Flash developers are afraid of JavaScript. Their point of view: Stealing JS source code is effortless, one would just 'view source' and copy it. Yes, you can decompile Flash bytecode, however it ...
5
votes
2answers
194 views

User entered Javascript security implications

I'm creating a web site that lets people create their own site using a subdomain. Are there any security implications by letting people add custom javascript to their pages? If so, which ones? XSS? ...
5
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2answers
2k views

Is a JavaScript implementation of AES any less secure than other language implementations?

There are a few JavaScript AES implementations available such as Gibberish-aes So assuming the AES algorithm has been implemented correctly in this library then it should be as secure as any other ...
4
votes
2answers
1k 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 ...
4
votes
1answer
6k views

Can your Windows or Linux username be exposed to websites?

For example: Accessing a website with javascript enabled can expose information such as browser, fonts and local time. Can it, theoretically, expose your Windows or Linux username? Will saving a ...
3
votes
4answers
686 views

How can I constrain or limit 3rd party Javascript (*.js) files that can DOS my site?

Many website owners integrate Google analytics, various Facebook or Twitter social media javascript plug ins into their web pages. The problem is that this trust seems to be "all or nothing", meaning ...
3
votes
2answers
3k views

Is XSS possible here? Challenge

Is possible to bypass my regex and execute any javascript? <script> function json(a){ if (/^\s*$/.test(a) ? 0 : /^[\],:{}\s\u2028\u2029]*$/.test(a.replace(/\\["\\\/bfnrtu]/g, ...
2
votes
1answer
179 views

HTML iframe security exploit

Can somebody explain if there's something malicious in this HTML, The width and height of the iframe ares set to 1 and it's out of the view with top: -100px; statement. I believe it takes some some ...
2
votes
2answers
271 views

Securing a Shuffle Algorithm

After reading about writing a secure shuffle algorithm, I realized that my module that generates a password is only as strong as my PRNG, which in this case is Math.random(). I'm confused as to how to ...
2
votes
1answer
608 views

How to hide victim pop-up in clickjacking?

I am testing a web application for click-jacking vulnerability. The attack works fine for single clicks, however i am trying to delete a file and the hidden frame (victim) throws a pop-up ...
1
vote
2answers
851 views

Digital Signatures of XML, PDF and Office Documents on every platform

I'm trying to develop a website that performs digital signatures on client-side and then sent the signed document to the server-side. I want to do the signatures on client, due to the fact of not ...
1
vote
1answer
451 views

How do you limit javascript api to a domain?

Ok, many of you now the scenario: you login to developer.sayLinkedIn.com, create an app with credentials and define the domain in witch that key is allowed to "run". The question is, from a api ...
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 ...
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vote
2answers
632 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, ...
0
votes
2answers
60 views

Reflective XSS in script codes with Content Type “text/javascript”

I have a webpage that returns raw script code with the headerContent-Type: text/javascript. However I found that there is a reflective xss in one of the parameters passed to the url which is copied ...