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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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 ...
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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, ...
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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 ...
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752 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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181 views

Want to build a password manager using OpenPGP.js

I'm kind of tired of the password managers that are available around... I need one that's open source, that works on OSX, that lets me store .pem files and that I can trust. As I haven't found one, I ...
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177 views

Hidding ip address in a peer to peer connection

I'm curious is it possible to hide the ip address in a peer to peer connection. Mainly considering you have 2 computer connected remotly in a browser session. I would like to know if it's possible to ...
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Implementing 'Remember Me' for a mobile application

I am developing a mobile application wherein I need to implement the 'Remember Me' functionality. There are certain pages within the application which require you to login. What I need to do is, if ...
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2k views

Can JavaScript be used to install malware?

Looking at the Pwn2Own contest got me thinking: http://arstechnica.com/security/2013/03/pwn2own-carnage-continues-as-exploits-take-down-adobe-reader-flash/?comments=1 If you have all plugins turned ...
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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 ...
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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 ...
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278 views

Is the OData Protocol susceptible to Insecure Direct Object References?

The Open Data Protocol or OData is a great protocol created on top of Web Technologies.It uses the URI convention for the data exchange using Atom, JSON and XML. You can use the URI convention ...
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47 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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285 views

Online Shopping password keylogger risk

Suppose I do an online shopping they are asking me to enter my card details like four digit number(whatever related to that) and they are asking me to enter the PIN number too. If I enter all this ...
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131 views

BeeF - How does it work?

I'm mainly server sided. I haven't worked with JS that much before. My coworker was talking about beef and how it basically controls the victims browser just by a simple xss attack I was wondering ...
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293 views

Is it possible to execute xss under these conditions?

Is it possible to execute xss under the following conditions? The following blocked characters and words are replaced with _. characters: > , : , ; , " , ' , # , ~ , \ , % , ( , ) , [ , ] , { , } ...
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922 views

“pagesinxt.com” links in the sourcecode, am I being hacked?

At this moment I am being hacked and I do not know to stop it. Let me explain... My website is hosted in a VPS where I am the only person who has access to it. The page is builtwith ...
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62 views

Using DNS to track browser activity on a LAN

I am trying to create a small network auditing script that tracks HTTP and HTTPS domain names visited by certain hosts using the libpcap wrapper for Nodejs. At its best the script would be able to ...
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155 views

Could I XSS a page that filters &,",< and > characters and has Content-Type set to UTF-8?

I am trying to pentest a dummy website that has a form with a TEXTAREA input on one page. When the form is submitted, the contents of the form are displayed on a second page. However, the second page ...
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135 views

Is it safe to call an untrusted service with jquery.ajax and dataType 'jsonp'

From what I understand, the JSON-P technique generates a script tag into the DOM of an HTML page to get across the single-origin restrictions imposed on the XMLHttpRequest JavaScript API for AJAX ...
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84 views

Detecting code source variants of the same function [closed]

Suppose I have this JavaScript malicious function f1() : <SCRIPT type="text/javascript"> function f1(){ a=1; b=2; c=a+b; } </SCRIPT> This function is embedded within a larger ...
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149 views

If I change any character in a private PEM, should the public PEM be different?

I'm generating a public PEM-format key from a private PEM-format key. I noticed that if I change a few characters near the end of the private PEM that the public PEM generated from the modified ...
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2k views

Is jQuery.val() enough to prevent XSS

Is obtaining the value of a textarea/input with the jQuery function .val() XSS-proof? <html> <textarea id="t1"></textarea> <script> var toBeDisplayed = ...
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335 views

Hashing Passphrase in Client-Side JavaScript Rather than Server-Side — Is it Viable?

Yet another salting-and-hashing-for-web-sites question has been left on the doormat of Information Security's StackExchange. The oft-mentioned approach for website password-handling is to use a ...
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4k views

Ways to completely spoof browser user agent and hiding OS to a webserver

This is a follow-up to the following question: Can a website determine what OS or web browser a visitor is using if the useragent is blanked/changed? If I have understood the answers correctly, a ...
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180 views

Web speech API security

Does the web speech API send the audio to a third-party web service in order to do the speech-to-text conversion, or is everything built into the browser? I'm trying to work out how secure this API ...
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153 views

How does window.w3ssss hack occur

Recently a .Net MVC 2 application on our server was infected with a virus / hack, it added some Javascript to the index.aspx pages of the site. While we have cleaned it up, I have not been able to ...
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How do I holistically protect a web service from network and MITM attacks?

I have several financial web services that are accessed over HTTPS, however the client devices may be accessing the web services over untrusted WiFi, through questionable proxies, and possibly ToR ...
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199 views

Replicating javascript actions from different website (XSS?)

I've got html / javascript code on my site like this: <a ...
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47 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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84 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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104 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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112 views

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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127 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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105 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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167 views

How can one find keyloggers in javascript?

Assuming no XSS and a client-side only page, how can a keylogger be identified in javascript code? Should I simply look for the id of the targeted fields and possibly some sort of DOM traversal to ...
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136 views

Securing Javascript plugin

My company offers a Javascript plugin that is meant to be embedded with websites. It works in a similar fashion to Google Analytics, in which you add a bit of Javascript and then it does some magic on ...
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232 views

Does this reflected XSS vulnerability pose any real threat?

I have a web site where users can enter some text into a textbox and that text is immediately rendered in a div using javascript (strictly front end). If a user enders something like this: This is ...
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156 views

Authorization with MD5 imlemented in Javascript

I want to use MD5 function (JavaScript library) to hash password before send it to server during logging in to website and during registration proces. I want to ask is it a secure method? I can't ...
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81 views

What is the best approach for securing log-in credentials on an HTML form?

I realize how basic this question is, but I have relied for years on mechanisms built into .NET to handle log in for me. These days, most of my work involves using client-side logic and calling API ...
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1answer
87 views

Base Programming for vulnerabilities

Hello, I am a beginner looking for some information. My question is the following: In order to understand certain security concepts is it essential that I understand the underlying languages? For ...
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495 views

What is the risk of cross site scripting if I embed javascript into a website

What is the risk of cross site scripting, if I embed javascript into a website? Quite simply, I am using a 'site builder', and they don't allow rotating images, but they allow you to embed code... So ...
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1answer
3k views

In which ways could a javascript making a cross domain HEAD request be a threat?

I was just reading this answer to the question Why is the same origin policy so important? Basically, when you try to make an XMLHttpRequest to a different domain, the browser will do one of two ...
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1answer
2k views

Certificate authentication with jQuery's ajax() function

I need to sync with my server with the client certificate abc.pfx which is generated by the server using Ajax. How do I send my certificate with Ajax object. Can I do this certificate authentication ...
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bypass a regex filtration to perform an xss attack

Does the regex [\w/$!.*-]+$ stop the injection of payloads like : "><script>alert(4)</script> " onload="alert(4)" ...
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Can XSS vulnerabilities present in 3rd party js libraries be used to attack the app that uses the lib?

I am using various 3rd party libs like cordova.js, jquery, jquery mobile, mobilizer and so on, in a an android mobile app.. These libs are found to have various XSS vectors through insecure use of ...
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HTTP Response Splitting

Is this apart of a HTTP Response Splitting attack ? Here below is some code that gets put into a web browser after clearing the url while on the website javascript: var xhr = new XMLHttpRequest(); ...
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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 ...
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112 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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205 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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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 ...