AJAX (Asynchronous JavaScript and XML) is a popular technique for creating interactive websites, by providing a concept for data exchange between client and server asynchronously.

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Cookies + CSRF protection + AJAX

In my app (built in Codeigniter), users can submit status updates. When submitting forms, Codeigniter automatically provides a hidden cookie. I can validate that cookie through AJAX when the user ...
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1answer
993 views

Is one CSRF token per session is adequate with HTTPS?

Ours is a Ajax heavy application with concurrent Ajax requests. Generating unique tokens with each request or expire and creation of new tokens after a certain interval could get tricky with multiple ...
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CSRF protection for AJAX when using multiple browser tabs

Say I've got that web application that has a CSRF protection according to the Synchronizer Token Pattern. The server expects a valid CSRF token in each POST request when the user is authenticated. Now ...
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3answers
8k views

Security risks with JSONP?

What are the security risks with JSONP? Is using JSONP in a new web application reasonable, from a security perspective, or is it better to use a different method for cross-origin web mashups? If ...
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2answers
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How can I prevent reflected XSS in my JSON web services?

I have a web service that takes POST data (JSON) and returns part of the request object in the JSON response. This is open to XSS if the response is rendered as HTML by the browser since someone ...
5
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2answers
1k views

Ajax and CSRF protection

Without going into too much details I have a site which is 100% Ajax. All requests to the site (both GET and POST) are done via Ajax. Now I have to implement CSRF protection, and all the solutions I ...
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4answers
2k views

Protecting against CSRF when a form is being submitted via an AJAX call

I'm using anti-CSRF tokens on all my forms to prevent CSRF attacks. Also, the tokens are being saved in the $_COOKIE variable to validate against the value I get from the form. I'm resetting the token ...
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1answer
279 views

Blocking direct access to ajax source

I made a calculator. I want to prevent that people can use the ajax.php to get the results without accessing the webpage. They have to use the API for that purpose. I suppose I can add a key ...
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3answers
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Set Cookie in XHR response : How different browsers handle this?

If I send a XHR request to example.com and response has Set-Cookie: dummyCookie=dummy in response. How different browsers handle this? Does any version of any browser set the cookie for ...
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2answers
3k views

Security drawbacks for using short-lived access token in javascript client side

I intend to build a front end site entirely in javascript (NodeJS) and i would like to do ajax calls to a REST WS which is on another domain on client side. I intend to use oauth2 and SSL to secure ...
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What is the point of the same-domain rule for xmlhttprequest when script tags/JSONP can cross domains?

I get that I don't want a page loaded from stackoverflow.com to be able to request gmail.com on my behalf and read my email--but this seems to be simply a cookie issue. Since JSONP bypasses ...
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4answers
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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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1answer
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Is this jQuery ajax call vulnerable to XSS?

If somebody can edit $("#field").val(), can they change the url property here to point to another location? $.ajax({ url: "http://mywebsite/script?param=" + $("#field").val(), dataType: "jsonp", ...
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1answer
893 views

Should I include a random padding in every HTTPS request and response?

According to the following paper, it is possible to decrypt HTTPS traffic by inspecting AJAX calls and using the size parameter as a cryptographic oracle. Should I be sending a variable length ...
7
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3answers
10k views

Secure jquery ajax calls from a non secure page

I could not find a clear answer, but if I have the following situation: I browse to a page let's say http://www.example.com/index.html Now I use a form on this page to do a postback with jquery's ...
7
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1answer
950 views

Access to other local files from a local HTML file

I tried this question on programmers site with no luck Do you see any reason to block a local html file from accessing another local files located in the same folder? I mean, if a user downloaded an ...
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4answers
6k views

Is AJAX fundamentally insecure?

Possible Duplicate: How to do Ajax securely? At my workplace many people believe that AJAX is fundamentally insecure. I am under the impression that AJAX is exactly as secure as any other ...
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2answers
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How to do Ajax securely?

This question is inspired by this security question http://security.stackexchange.com/questions/1707 What are the threats in using Ajax? (Please note I am talking about security threats, not ...