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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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 ...
3
votes
2answers
268 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 ...
11
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2answers
383 views

What should I look for when auditing a Firefox extension / plugin?

I've been asked to do a security audit on a Firefox add-on developed by a third party. I am a web developer with a reasonable grasp of JavaScript but am not a browser security expert. What kinds of ...
11
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3answers
1k views

What bad coding practices makes a browser extension vulnerable?

I'm trying to scan JavaScript files for vulnerabilities using JSHint. Specifically, I'm scanning the JavaScript files of browser extensions. To look for possible vulnerabilities I'm looking for bad ...
4
votes
1answer
657 views

XSS JavaScript Double Quoted String with HTML Escaped Possible?

Is it possible to inject XSS in a JavaScript variable if a website inserts HTML encoded, user input in a double quoted string? var userString = "perfectly "safe" input from user?";
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1answer
246 views

Are GET, POST and windows.location vulnerable to XSS in a Wordpress theme?

I created a Wordpress theme for my client. He told me that he scanned my theme with a vulnerability scanner, and that it has security issues with the GET and windows.location methods. Is this really ...
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1answer
456 views

Cross-site request forgery attack. How can we stopped this? [closed]

On one of our websites, we are seeing this code is adding itself. I tried to figured out but no success. One thing I have noticed when I removed the html, head and body starting tags, it's gone. Our ...
3
votes
4answers
472 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 ...
4
votes
2answers
751 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 ...
3
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1answer
1k 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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3answers
976 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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2answers
1k views

Stopping js malware injection on our Wordpress site

This had been added to our wordpress site, specifically in the footer.php. hxxp://pkktjuchlrv.peguards.cc/02b31ac5iq/get.js It is malware as defined by google, i belive it is tracking code. We have ...
2
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2answers
193 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 ...
13
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3answers
2k views

Cross Site Scripting without special chars

I'm testing a web application and I found a XSS vulnerability. I can break a tag and inject some code to the application but nothing potentialy dangerous for the client. The application has a filter ...
4
votes
1answer
113 views

Security consequence of Javascript hole in an online chat?

For an online chat that allows basic HTML, what happens if they leave an open way for a potential hacker to execute javascript on everyone who is in the chat? What is the worst thing they could do?
7
votes
2answers
351 views

Best practices for integrating external javascript?

I'm looking for some standard pieces of advice on how to integrate external JavaScript into a website. For example, on mywebsite.com: <script ...
11
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2answers
2k views

What does this injected code do?

One of my sites has just been hacked as this code has been inserted into random(?) files and places within the files. Does anyone understand what it is trying to do? I would welcome anything that may ...
2
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2answers
137 views

Is it safer to store the XSRF value inside your JavaScript?

To protect yourself against XSRF, you need to have a separate token on a page. See: Coding Horror: Preventing CSRF and XSRF Attacks, by Jeff Atwood As the posting suggests, its best to have those ...
10
votes
5answers
1k views

CSRF protection with Session Id

To protect against CSRF, couldn't my page javascript just dynamically insert the session id from the cookie into the body of each HTTP request right before it's sent? The server would then just ...
5
votes
2answers
148 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? ...
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vote
1answer
1k 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 ...
6
votes
4answers
4k 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 ...
2
votes
1answer
304 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 ...
4
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2answers
578 views

XSS: Parsing Javascript

Reading about DOM based XSS from http://www.webappsec.org/projects/articles/071105.shtml It illustrates some examples like: ...
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votes
2answers
327 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 ...
0
votes
1answer
1k views

Security Testing AngularJS Web Application

An angularjs application stores user input to local/sessionStorage and retrieves it later to fill the form fields or display that content later. If a javascript is submitted as user input, it gets ...
2
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1answer
126 views

US Department of Labor Watering Hole Attack

So I read this article about how the US Department of Labor's website was compromised and users were redirect to a site that installed malware: ...
3
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1answer
259 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 ...
4
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2answers
862 views

Web & insecure HTTP - Using RSA for encrypting passwords on the client side

I used client side password hashing in my register and login project. Its purpose is to prevent passive adversaries/eavesdroppers from discovering users' plaintext passwords when HTTP requests are in ...
3
votes
2answers
533 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 ...
9
votes
4answers
3k 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
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 ...
7
votes
3answers
2k views

Is there a way to bypass Django's XSS escaping with “unicode”?

Django (the Python web framework) escapes output to prevent XSS (Cross Site Scripting) attacks. It replaces ', ", <, >, & with their HTML safe versions. However this presentation on slide ...
0
votes
1answer
153 views

How does DOCTYPE selection affect security of my AJAX app?

I'm considering using modern techniques to protect my Javascript code and am studying how the DOCTYPE element selection may impact that. Specifically, the linked question used IFrames which are not ...
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vote
3answers
4k views

What typically is the expiration date of a session cookie?

I need to create a session cookie using JavaScript (for more info see question). I'm wondering what should the expiry date be? I'm guessing it's the browsing session, so if I don't set an expiration ...
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vote
1answer
933 views

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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votes
1answer
272 views

can someone break my anti dom based xss from the window location? [closed]

can someone break my anti dom based xss from the window location ? function parseparameters() { var href = window.location.href; var id = href.indexOf('#'); if (id ...
6
votes
3answers
823 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.
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votes
1answer
228 views

some questions about DOM based XSS [closed]

Is it possible to do a DOM based xss attack with window.location.protocol? How can we use dom based xss with document.title? How can we bypass the escape javascript function if it is used? thank ...
0
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1answer
567 views

Sanitizing JavaScript to prevent XSS

I'm going through a vulnerability remediation exercise for a client and am trying to figure out how to best mitigate this particular hole. There's a script on our site that calls up content into a new ...
7
votes
1answer
1k views

What possible use does an iFrame have for security?

I'm looking at code for an old login form I'm redesigning. It's a simple table with two input fields for username and password. But just before the end </table> tag there's a blank iFrame which ...
0
votes
1answer
320 views

How can I ensure privacy when outsourcing authentication to an IdP (Identity Provider)

I need to outsource authentication to an IdP (Identity Provider) but I don't want that IdP to know of the calling site. The two major issues are the callback URL and the referer header. Is there any ...
3
votes
3answers
499 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 ...
1
vote
2answers
824 views

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 ...
1
vote
1answer
896 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 ...
1
vote
4answers
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 ...
2
votes
1answer
101 views

Return AWS signature over HTTP

I am performing multipart upload to S3 straight from the browser, i.e. bypassing my back-end. My JS code sends a hand-shake request to S3 (a POST), then uploads the file in chunks of 5MB (a PUT for ...
2
votes
1answer
369 views

Newline XSS vulnerability

So I was experimenting with XSS using new line (%0A) character. So I got to the usual vector: '%0Aalert(/xss/)// and one thing came to my mind. What if you can't insert a quote? A new line will break ...
0
votes
1answer
276 views

Can a Javascript - WebGL proof of work system prevent website spam?

Is it a good idea to come up with a Javascript-based Proof of Work system to reduce spam on forums, and other websites? This idea would be similar to HashCash, but the computation would be based on ...
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3answers
1k views

What security risks does Firefox 19's built-in PDF reader (pdf.js) bring?

Firefox 19 ships with pdf.js as the default PDF reader. One of the main stated goals is to reduce the exposure of users to the often vulnerable Adobe PDF reader/plugin. So what new risks does pdf.js ...