Tagged Questions

3
votes
1answer
171 views

CodeIgniter CSRF confusion

I have been working with CodeIgniter for about 3 weeks and am very well on the way to loving this framework. However I have been looking at the core code of the framework and I was reading over the ...
5
votes
3answers
243 views

CSRF Countermeasures

I'm working through a book on web application security and it says that an effective CSRF countermeasure is to assign a temporary pseudo-random token to sensitive actions performed by authenticated ...
2
votes
2answers
302 views

How does a CSRF token prevent an attack, and how can I safely use/avoid it for my JSON API?

I'm trying to make an iOS app communicate with a Ruby on Rails website using JSON. While trying to post a login to create a user session, I discovered I was missing a CSRF token. I had no idea what ...
3
votes
1answer
169 views

How did the Tumblr worm spread?

Recently Tumblr was hit by a fast-spreading worm. How did the worm work? What was the vulnerability in Tumblr that it exploired? Did it exploit a XSS vulnerability in Tumblr? A CSRF vulnerability ...
0
votes
3answers
88 views

Does AV software protect web applications (Twitter, Facebook, etc) from attacks? (CSRF, etc)

Is it correct to say that AV software focuses on downloaded executables and locally malicious activity, and it doesn't actively scan HTTP/S content for web based attacks such as CSRF, XSS, phishing ...
1
vote
1answer
128 views

Is there formal guidance that requires all sessions to be logged off when a user changes their password?

Often when an account is hacked, security guidance is to change your password. However I've noticed that changing a password sometimes isn't enough to log out of other sessions that are active. Is ...
4
votes
2answers
230 views

CSRF Protection on static pages

I have a static site which has forms. The forms submit to a Rails endpoint which captures the submitted data. The static site and the Rails endpoint are on the same domain, on different subdomains and ...
5
votes
4answers
558 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 ...
6
votes
3answers
886 views

CSRF cookie vs session based tokens

I will generate a CSRF token and include it in a hidden form field. When receiving the request, I will check the form value against the value either stored in the user's session or in a cookie. Is it ...
0
votes
1answer
151 views

Understanding CSRF vulnerability in Web Application?

I want to understand what is CSRF vulnerability. I use authorization system in my web application and found CSRF. What should we do to solve it? Actually I want to create simulation for this ...
1
vote
2answers
255 views

Does vulnerability exist when using XHR with GET method and custom anti-CSRF HTTP header?

Imagine button after clicking which browser sends XHR http request with GET method. Characteristics: after executing request sensitive action is performed sensitive information is sent in GET ...
4
votes
4answers
5k views

Security issues using iframes

We are looking to move to iframes due to technical challenges. By moving to iframes it will be easier to manage the technical issues. But we are not totally sure of security implications of iframes. ...
3
votes
4answers
472 views

Can a CSRF CAPTCHA be defeated?

One defense that developers use to protect against a CSRF attack is to implement a CAPTCHA in critical steps. A CAPTCHA ensures that a human is at the keyboard approving the activity. But I've ...
1
vote
2answers
436 views

anti-CSRF tokens vs Referer and POST testing

I understand anti-CSRF tokens to be a chunk of data sent in the response that is expected to match in subsequent requests, but is not stored in cookies. For example, a form with a hidden value that ...
1
vote
2answers
512 views

how an iframe can cause xsrf?

I know how a form tag is prone to CSRF which does not use any token (or any other challenge-response mechanism) but I was wondering how an iFrame can be used to cause XSRF attack and what would be the ...
7
votes
4answers
1k views

CSRF protection needed for clients that don't accept cookies?

I have recently updated a website from Django 1.0 to 1.3. One of the changes introduced was automatic protection against CSRF attacks. For the most part, this works great, but I have a problem with ...
6
votes
7answers
530 views

Should I prevent sending of GET requests for urls that are normally operated with POST request?

There is an url that is normally operated using POST requests (i.e. POST request is sent when user submits form). But attacker can form GET request with parameters that are sent in POST request. This ...
5
votes
2answers
359 views

What is more secure: Many subdirectories, or many subdomains?

I have 3 websites that could be configured as a "VirtualApplication" in servicedefinition.csdef: www.mydomain.net/enroll www.mydomain.net/admin www.mydomain.net/ ... or I can configure them as a ...
3
votes
2answers
655 views

When should I not use CSRF protection for a form?

By default, I have CSRF protection for all my forms using a token. However I noticed another web application that has a similar function to one of my forms. ANd they did not use CSRF token. So I ...
1
vote
2answers
1k views

Should CSRF 'Double Submit Cookie' technique have a different seed value for the cookie versus the HTTP POST?

I'm reading about the OWASP double submit cookies method of protection and there it states that the cookie value between the header and form should match. That seems to be somewhat of a risk, as the ...
11
votes
4answers
3k views

What is the correct way to implement anti-CSRF form tokens?

I am fully aware of CSRF and have already implemented some safe forms, but I have never been happy with the results yet. I've created tokens as a md5 of username, form info and a salt and stored it ...