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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160 views

Ransom32: How does it work?

Ransom32 seems to be a new ransomware written (partly) in JavaScript. As I understand it, it doesn't affect a user through a browser / by visiting a website, but by downloading some .rar file which ...
3
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1answer
101 views

Is it possible for XSS to occur in src attribute?

I'm working on XSS vulnerability and understanding it. I know in following cases cross site script injection happen in Javascript context Inside <script> tag. Inside html tag in event handler ...
3
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1answer
184 views

Does the use of JavaScript make ProtonMail insecure?

I like the look of ProtonMail. However, what has stopped me from signing up is that JavaScript seems to be used at various points in the site, and for someone to read your email they must click on a ...
3
votes
1answer
196 views

How to get TOTP password with hmac sha 512 as hashing function?

ive never learned about javascript and network security before, but lately ive taken on some programming challange but i have to send my project link via http post request, and i have to figure the ...
3
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1answer
102 views

Where to store IV and salt when doing clientside encryption with no server

I'm making a chrome app that does client side encryption of user messages. There is no server in my architecture. The encrypted text messages are saved as files in the user's Google Drive. I'm using ...
3
votes
1answer
582 views

Dom based Xss Query - location.hash

I was just looking at Dom based xss and wondering if hash value is written to a variable in javascript context can lead to Cross site scripting. The code looks something like this: <script> var ...
3
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2answers
230 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
1k views

encodeURIComponent in a unquoted HTML attribute

My gut feeling is that the following should be attackable: $("<td><a href=somefile.php?url="+encodeURIComponent(somevar)+">Download Here</a></td>"); In contrast to $("<...
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4answers
1k 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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2answers
795 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, ...
3
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1answer
1k views

Security implications of adding all domains to CORS (i.e. Access-Control-Allow-Origin: *) [duplicate]

I am curious of what all the security implications are if I set the following two HTTP response CORS headers; Access-Control-Allow-Origin: * Access-Control-Allow-Credentials: false The only ...
3
votes
2answers
150 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 ...
3
votes
2answers
121 views

Is it possible to trick a person into going to a website, and running JavaScript, without them knowing? (no iframes)

My website is W. If you make a GET request to my website, it gives you JavaScript, and if you execute the JS, then you do some action (if you are logged in and have a session cookie). Can someone ...
3
votes
1answer
171 views

Understanding hack on ecommerce site

I need help in understanding this hack and maybe I can get more information out of it. This script was inserted on our website (maybe through a weak password): eval(atob("string")); the string ...
3
votes
1answer
190 views

Uncontrolled Format String Vulnerability in JavaScript

I have been working on input validation vulnerabilities and very new to Uncontrolled Format String Vulnerabilities, as I learned so far its usually exploited through printf functions with "%". I ...
3
votes
1answer
601 views

Google Analytics use of JSONP, what are the security risks?

These days Google Analytics uses a JSONP request to load ga.js into user's web pages via a callback function. According to the Wikipedia, JSONP can "inject any content into a website." What exactly ...
3
votes
1answer
820 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 ...
3
votes
1answer
156 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 ...
3
votes
1answer
450 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 ...
3
votes
1answer
149 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. +----...
3
votes
3answers
215 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 ...
3
votes
1answer
2k views

HMAC secret key client storage

I've read numerous articles about using HMAC and the secret key for client authentication in a RESTful client (Javascript) application today. Still, I don't find a single source that is able to ...
3
votes
1answer
365 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 ...
3
votes
1answer
2k views

Access-Control-Allow-Origin header spoofing?

Is it possible for a attacker to spoof the Access-Control-Allow-Origin header? Or, is it secure enough to protect resource access via the Access-Control-Allow-Origin header? I'm trying to make an ...
3
votes
2answers
275 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 ...
3
votes
0answers
37 views

Simple Authentication Method to Secure REST API

I've been desperately trying to find a simple method of securing my API but still haven't found one that works. Unlike a lot RESTful APIs my API doesn't need user logins, tokens that expire, or other ...
3
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0answers
73 views

How to indicate that content in an iframe is untrusted

As part of a website I am developing, untrusted content is displayed in a sandboxed iframe. The content is loaded using the srcdoc attribute, but the iframe is sandboxed using sandbox="allow-scripts", ...
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0answers
275 views

Problem in underscore.js with “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 ...
3
votes
0answers
73 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 IT....
2
votes
2answers
18k 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 ...
2
votes
2answers
3k views

What's the limit on the size of the data that public-key cryptos can handle?

Someone mentioned here that asymmetric encryption might not be appropriate for bulk data and gave an example of RSA with 100 bytes. Of course, I understand that it was a rough example. But it made me ...
2
votes
3answers
2k 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) {if(...
2
votes
2answers
141 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 = ...
2
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2answers
1k 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
votes
1answer
379 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 ...
2
votes
2answers
108 views

which encryption is used in this JS Variables

Which encryption method is used for these variable names: var g_license_info var g_server_time_obj Respectfully encrypted to: var ago05b4e111efe149737a67a177f00ffad2 var ...
2
votes
3answers
628 views

How to spoof my IP address to JavaScript and other security concerns

Many websites require JavaScript. However, enabling JS means that a website can run a JS snippet to retrieve the user's IP address (even if they are behind a proxy or VPN). So, how can I (the user) ...
2
votes
2answers
420 views

is it sufficient to convert '(single-quote) to ` &#039; `

Is it sufficient to convert ' to &#039; , > converted to &gt; and < converted to &lt; to avoid xss A bit of context: the payload would be going through the URL and landing in a <...
2
votes
4answers
413 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 ...
2
votes
2answers
356 views

I need explanation on how serious these vulnerabilities are?

I have found two vulnerabilities on my college site and I want to report them but don't know if these are "really" vulnerabilities : RFI inside SWF file. Example: https://www.site.com/opis.swf?...
2
votes
1answer
10k views

Encrypting string in JavaScript and decryption in Java [closed]

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 ...
2
votes
2answers
413 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 (...
2
votes
2answers
100 views

Hardening Javascript in respect to Javascript Malware/Ransomeware like Ransome32

Are there any methods or standards to harden Javascript implementations to help reduce/remediate the the risks associated with Javascript malware like the Ransom32 or other types of Javascript attacks?...
2
votes
1answer
74 views

How and why does case insensitive XSS work, given that JavaScript is case sensitive?

I found a lot of instances where XSS scripts like the following work: <iMg SrC=x OnErRoR=window.location=123> Given that JavaScript is a case sensitive language, how is the browser able to ...
2
votes
1answer
376 views

Hashing user passwords via Javascript client-side versus server-side hashing? [duplicate]

I got into a discussion with one of our senior developers over password hashing/transmission best practices and it left me curious as to what the industry standard best practice is. In the previous/...
2
votes
2answers
2k views

If using htmlentities or htmlspecialchars functions is enough for block XSS attack

I know this question was discussed on net various times. and people give some example how to bypass these functions through passing some code. But here one issue, All example of htmlentities/...
2
votes
1answer
284 views

How sharing location via web actually works? (It gets my exact house address)

I know that this could be a repeated question, but I'm freaked out right now, Maybe Im old or out of the 2015 technologies, but i just visited this page: http://whatismyipaddress.com. As I know, ...
2
votes
1answer
210 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 can'...
2
votes
3answers
288 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 ...
2
votes
2answers
2k views

XSS in HTML meta tag

There is a web application which contains a search function. When I search for aaaaaaaaxss I get this: <meta property="the:property" content="100 Results for aaaaaaaaxss (Page 1)" /> It strips ...