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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Hiding JavaScript source code

In a web-app should one strive to hide as much of the code as possible, for example from view source? In particular I was wondering should JavaScript be hidden, especially ones used for Ajax? I was ...
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2k 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, ...
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4answers
3k views

What does scorecardsresearch.com/beacon.js - added by Disqus.com - do?

I recently added Disqus to my site. Looking at the "scripts" tab on Firebug, I noticed a script called, http://scorecardresearch.com/beacon.js (here is a prettified version - the script is not ...
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5answers
785 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 - ...
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3answers
521 views

Stop code injections into page code

I started a topic HERE on the stackoverflow site, but was refered here. I did get some info there, but think it need's more indepth input. So hopefuly people here can help. I have a few domains ...
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2answers
565 views

How can JavaScript be tampered with while viewing a web page?

I often hear about how client side JavaScript can't be relied on because it can easily be changed. How exactly can it be changed, what program would be used to modify the JavaScript before a page ...
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1answer
449 views

Is this code harmful? Why?

Code: http://pastebin.com/kJ8ZGP82 That code gets retrived from http://ui.sidepage.co for every HTTP page I visit (not HTTPS) and load it into the body tag of the page. Is it harmful in any way? ...
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600 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 ...
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5answers
392 views

Is it possible to see if a script on a website steals session cookies?

I'm looking as some web analytics solutions, I know it sounds paranoid. but cookie-based web analytics need for you to paste their JavaScript code on your web-site. I don't like the idea too much of ...
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4answers
482 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 ...
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2answers
553 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!" ...
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2answers
374 views

Can a whitespace regex character be used to perform a javascript injection?

if I want to validate the input of a <textarea>, and want it to contain, for example, only numerical values, but even want to give users the possibility to insert new lines, I can selected ...
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3answers
4k views

Facebook spam / phishing attempt?

I got this sent by a friend on facebook and i dont think its a genuine message ___ shared a link on your Wall. This will leave you speechless) ...
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2answers
900 views

Risks of client-side encryption using Stanford Crypto Library

I'm building a simple web application for encrypted chat. Each message will undergo 256-bit AES encryption on the client side, using the Stanford Javascript Crypto Library. No unencrypted data or ...
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2answers
272 views

Injecting information in a web page (Gmail). Does it raise security problem?

I am developing a Google Chrome extension which encrypts/decrypts emails for Gmail users. So, I detect encrypted emails when the user opens an email on using tags. Once an encrypted email has been ...
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1answer
267 views

Security of Javascript in mobile browsers

Is Javascript on a mobile browser more secure than Javascript on other types of systems? For instance, if I have a site that includes some client-side (Javascript) encryption code, with the intention ...
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2answers
462 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 ...
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2answers
580 views

SJCL : convert ascii to a BitArray & compute random numbers

I am using the Stanford Javascript Crypto library and i'd like more information about it. 1.) I have an ASCII text and a random 128-bit key. I want to concat those two things, so I convert the ASCII ...
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1answer
2k 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 ...
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2answers
323 views

Should the Keygen element be used to create a certificate for mutual auth TLS? What alternatives are there?

I'm interested in using mutual auth TLS to improve the security of my javascript based webservices . I've looked at the Keygen element and given all its issues, not sure if this can even be used for ...
3
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1answer
137 views

Javascript client side image decryption, does this add any safety or is it flawed

I want to store passport copies safely in a database, the database itself is a normal MySQL database and on a somewhat trusted web server. The user who owns the passport copy should only be able to ...
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1answer
149 views

Danger of hidden html form uploading users local files without their knowledge

Is there a danger that a webpage could have a hidden form with a file upload input and js script that would try and take a random guesses at files on a users system and attach them to the form and ...
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4answers
96 views

What is the technique to determine if a user is “reading” a page called? (similar to “infinite scroll”)

When I read an article at Salon.com I notice that the "overflow content" (where I need to scroll down) is loaded on demand. I can't imagine this being a useful bandwidth savings technique, so the ...
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4answers
344 views

How is this XSS attack working?

SPOILER ALERT: This question contains an answer to one of the problems from the Google's XSS Challenge! Please stop reading further if you're not interested in knowing the answer right now. I'm ...
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1answer
523 views

OWASP Recommendation on Client-Side Password Hashing

The OWASP Application Security FAQ recommends the use of JavaScript to produce a salted hash of the password client-side with JavaScript prior to sending it to the server. Is this something truly ...
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2answers
105 views

User privileges for unsanatized code

We all know there are still vulnerable code out there even though they may or may not get exploited and found for hacking attempts. I've seen people do it countless times and have a possibly plausible ...
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1answer
220 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 ...
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1answer
89 views

user data accessible through javascript in browser

There are websites which display user information, such as browser version and operating system This website goes even further, and displays some additional information, such as desktop resolution, ...
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1answer
255 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 ...
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2answers
227 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 ...
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0answers
66 views

Is the use of JavaScript for cryptography ever appropriate in the browser? [duplicate]

Possible Duplicate: How secure is aSSL (javascript)? Does it effectively mimic SSL? After some searching around, I realized we don't have an easily visible canonical question about this on ...
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1answer
399 views

Is 'Forge' Javascript crypto library secure? [closed]

I need a client-side crypto library. I've seen https://github.com/digitalbazaar/forge linked many times on stackexchange. Forge seems to be the most complete and well-documented crypto library for JS. ...
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3answers
1k views

Javascript containing a long hexadecimal string and eval: is this suspicious?

At the bottom of the index.php file for a simple “contact us” form, I found the following (some whitespace and newlines added): try {if(window.document)--document.getElementById('12')} catch(qq) ...
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3answers
1k views

Javascript Diffie-Hellman and AES protocols

I am using the BigInteger Javascript library to create a symmetric key using Diffie-Hellman protocol. I want to create 128,160 or 192-bit keys. After some research, I have found out that I should use ...
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3answers
1k views

Why is the Samy Worm considered XSS?

Last night I was browsing notable computer attacks and came across the Samy worm, which apparently affected a huge portion of the MySpace network -- over one million users in under 24 hours, according ...
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4answers
1k 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 ...
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2answers
7k 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 ...
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1answer
119 views

Should a space in a password count as a symbol when checking for complexity?

There is no doubt in my mind that spaces should be allowed in passwords. I see some websites disallow spaces, symbols in passwords and even enforce minimum length which seems t otally nonsensical to ...
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4answers
242 views

Why aren't we all compromised on the internet?

Well, I've been thinking about this for a while now. Within the last decade, we've used various ways to make our websites look dynamic and live. For example, in JavaScript, it's quite easy to send ...
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2answers
276 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 ...
2
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4answers
683 views

Are malicious scripts in batch files detected by antiviruses?

we have many scripts in shared folders in our IT Department. Are malicious scripts in batch files detected by antiviruses?
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2answers
703 views

Is it possible to take down a site using javascript in the URL bar?

If a site is written poorly enough, is it possible to take it down or severely mess with it using only javascript in the URL bar?
2
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1answer
91 views

How does this website prevent directing away from it

I'm using the latest version of Firefox with Ghostery and Adblock plus installed. This website somehow prevents navigation away from it. How does it do this and how can it be protected against? I ...
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3answers
152 views

hiding javascript in image

I have read a post in thehackernews and searched the net to find how it worked. How can anyone add javascript in an image such that when the image is displayed it can run a script. Can this be done ...
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2answers
366 views

Need help deciphering malicious JS code

was hoping someone could give me a hand with deciphering this obfuscated Javascript added to a webpage that I own. As the code is quite large I will just link to pastebin posts but I can add them to ...
2
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3answers
6k views

Why is JavaScript disabled in the Tor Browser Bundle?

Didn't Tor create a local socks proxy? Why doesn't all the Web traffic go over this local socks proxy and why is JavaScript disabled in the Tor Browser bundle? If you would connect with firefox for ...
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2answers
268 views

Exploiting flash XSS holes

I have a URL to a flash file. Sample :- http://abc.mydomain.com/Findme.swf Now, there is a parameter called xmlpath as :- http://abc.mydomain.com/Findme.swf?xmlPath=something. Is it not that ...
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2answers
334 views

Can clients execute my python CGI at will?

I have a site where the main database is interacted with via python scripts located in public_html\cgi-bin\. To run commands, various JavaScript scripts, located in \public_html\scripts\, use jQuery ...
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3answers
115 views

XSS prevention by black-listing

I have a reflected XSS vulnerability in my Web application. I have decided to take the black-list approach instead of the popular white-list approach. My question is can there exist a malicious ...
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2answers
196 views

Identify code being run on website

I do not normally deal with internet security problems but this one has got me interested. The issue is with a specific site, lets say example.com, and how it it visited. If the address is typed ...