A cookie, also known as an HTTP cookie, web cookie, or browser cookie, is used for an origin website to send state information to a user's browser and for the browser to return the state information to the origin site. The state information can be used for authentication, identification of a user ...

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2
votes
2answers
981 views

How can Bank of America tell that I'm logging in on a computer I haven't used with them before?

When you sign into Bank of America for the first time on a computer that you haven't used with them before, they detect this and force you to answer one of your security questions. I think I've seen ...
4
votes
1answer
151 views

Resources/materials for implementing secure web services?

I'm implementing a REST-style (note: it needs to be more pragmatic than canonical) web API and I would like to secure it. The language I'm using is rather fresh and doesn't have a lot of high quality ...
2
votes
2answers
209 views

Are these two ways safe?

I have two scenarios and want to know if each is secure or which risk there are. Number One: If the User has the edit Link (edit/[md5hash]) he can edit a post. The editkey (the hash) is in an form ...
4
votes
2answers
223 views

Does the ability for a user to choose the value of a session id cookie constitute a security flaw?

In the context of a web application, a user connects to this application and a session id cookie is set to authenticate the user for next requests. As the cookie is actually present before submitting ...
3
votes
1answer
2k views

Should cookies that contain non sensitive information be encrypted?

I'm in the process of creating a website and uses cookies to track user login. The only bit of information I store in this cookie is the users username. Should I be encrypting the username even ...
11
votes
3answers
2k views

Protecting against cross-subdomain cookie attacks

I have been reading about cross-subdomain cookie attacks here. A quick overview of how it works (from Wikipedia): A web site www.example.com hands out subdomains to untrusted third parties One such ...
1
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 ...
1
vote
2answers
142 views

How do browsers know which cookie to get?

I tried writing a script that would display the contents of a cookie set by another website but it didn't work. <?php echo 'Website cookie is '.$_COOKIE['locale']; ?> But I get an undefined ...
2
votes
1answer
323 views

UUID and Open_id in cookie 'good' enough?

I am using Tomcat 7, jsp to build a small website. I am new to security and it is a school project so using Spring Security is not an option. I am attempting to store UUID and Open_id in the clients ...
1
vote
2answers
161 views

Guarding against XSS when setting Cookies based on URI?

I have a web-site written in nginx.conf — http://mdoc.su/ — which essentially accepts two parameters, an operating system and a manual page name, and does a redirect to a different site based on the ...
5
votes
1answer
140 views

What's the risk in putting semantically meaningful data in an HTTP session identifier?

I'm currently looking at performance optimization and am considering a way of speeding up cookie based session handling. There are advantages to having a session identifier in place when there is no ...
1
vote
3answers
447 views

Use Authentication using 2 encrypted strings

So, basically I am trying to log a user in with a cookie and do not query DB to improve performance. Here is a brief idea: Transmit everything via SSL Set a Global secret key A and secret key B ...
1
vote
2answers
233 views

How to check whether the cookie is set securely

I found solution for setting asp.net_sessionid cookie as secure. The solution is to make changes in web.config file as given below. <\system.web> I want to know if this change is setting the ...
2
votes
1answer
126 views

What's the point of rejecting a cookie?

When you access a website, lynx provide the option to reject a cookie, what's the point of doing so? All I thought about is that if you don't accept a cookie, you cookie won't be stolen during a XSS ...
2
votes
2answers
413 views

HTTPOnly Cookies: Security Depends on Client Cooperation?

I've been implementing HTTPOnly cookie-based session handling and have some questions about what HTTPOnly means. I realise it's a flag that gets passed around in the HTTP header when setting cookies. ...
1
vote
2answers
642 views

What security issues are there when reading cookie with .htaccess?

I have a (hobby) web site that runs only on SSL (i.e., site-wide HTTPS). The site does not deal with finances, social security numbers, or anything of that level of importance. However, I'd like to ...
20
votes
4answers
9k views

Demystifying Web Authentication (Stateless Session Cookies)

I'm currently researching user authentication protocols for a website I'm developing. I would like to create an authentication cookie so users can stay logged in between pages. Here is my first ...
0
votes
3answers
218 views

how Cookie tracking threat works?

as explained here and lots of other cases , what is this tracking story ? browser vendors say we have same origin policy and for example google.com can only read cookies saved by google.com or read ...
-1
votes
1answer
305 views

how to secure my login user id and passwords specially for facebook [closed]

i think they hack me with facebook cookies. i dont get what exactly is going on with me. every time i get the login notification from another ip location.i want to secure my cookies and i wanted to ...
0
votes
1answer
501 views

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 ...
1
vote
3answers
459 views

Web Application - Cookie Expiry

We are using a web application on cloud. I need a small clarification. We are using Perl with Apache. I see a following issue here for the below scenario. I need some inputs of whether this is most ...
1
vote
2answers
260 views

Is it possible to block third party cookies but allow them when they are first party?

I have been using Cookie Monster in Firefox for a while now to great satisfaction. However, I haven't found a way to allow cookies like Google's on Google's services but block them when I visit other ...
3
votes
3answers
3k views

cookies “secure” flag

How does cookies "secure" attr work to determines whether cookie itself should be included? e.g. [HTTP(unencrypted) connection] 1. user has no cookie yet and tries to log in; 2. user logs in ...
7
votes
3answers
1k views

Is my session-less authentication system secure?

So, I've created an authentication system. Poured over it for any kind of security flaws and tested the crap out of it. I think it's fairly secure, but there is one "different" by-design aspect of it ...
2
votes
1answer
2k views

cookie issue with same domain same path but different port

I have two web app running on same host on same path but on different port http://somedomain.com/ and https://somedomain.com/ now when I visit first app it serves the cookie say with name abc, and ...
8
votes
4answers
808 views

Preventing insecure webapp on subdomain compromise security of main webapp

I want your help on getting more concrete information on a type of vulnerability that I remember vaguely. I vaguely remember hearing about a year ago that if you set up a webapp on a subdomain, and ...
2
votes
1answer
3k views

Stopping Session Hijacking

If you noticed, I put "stopping" instead "preventing" in the title because I want my PHP application to be as secure as possible. I am wondering if anyone has any better ways to prevent session ...
1
vote
2answers
194 views

Secure cookies and Path Length Constraint

Using apache 2.2.3 on oracle enterprise linux. When setting following setting in httpd.conf: Header edit Set-Cookie ^(.*)$ $1;Secure , cookie generation (which happens on our registration page) ...
5
votes
3answers
240 views

What are the security implications of allowing unlimited size cookies?

Our application firewall blocks requests if it detects a cookie is present with a value greater than 1024 characters in size. Are there any exploits involving large cookies? i.e. How much more ...
6
votes
1answer
351 views

Identifying, analyzing, and predicting weak session cookies

To elaborate on this, I'm looking at this from the perspective of a hacker/penetration tester. Many times I have seen web applications that I know have weak cookies. I can tell this because I can ...
5
votes
2answers
4k views

Best way to securely set a session cookie on another domain

We currently have 2 sites http://www.foo.co.uk and https://secure.foo.com. The www site does not have an SSL certificate and is on a different domain. We have a login button on http://www.foo.co.uk ...
2
votes
2answers
308 views

How attacker can access victim's account without knowing its credentials?

I want to login facebook from a wifi connection and check sign-in page is over https but later when i don't pay attention to address bar (for example when playing games and click on links like a crazy ...
5
votes
1answer
436 views

Secure web user authentication even after server-side database compromise

By now, we should all know to use bcrypt or scrypt to store salted password hashes with a sufficient number of rounds. (See, e.g., https://www.owasp.org/index.php/Password_Storage_Cheat_Sheet) The ...
1
vote
3answers
713 views

Are tracking cookies illegal?

I have a merchant website. When a user visits the website, a cookie is set. Then when the same user visits the site again, we provide him with suggestions, content that he may enjoy based on what ...
7
votes
3answers
759 views

Is it secure to use bcrypt-generated salt in cookie to serve as token in place of a password?

I have a (hobby) web site that runs only on SSL. The site does not deal with finances, social security numbers, or anything of that level of importance. However, I'd like to secure it as much as ...
3
votes
1answer
143 views

Vulnerabilities of having one path of app accessible only via HTTPS but others via HTTP?

Imagine example.com that is accessible via HTTP and HTTPS. Most of content at site isn't secure and it won't be bad if it will be read by attacker. One of paths - example.com/secure_zone is accessible ...
5
votes
1answer
582 views

A Secure Cookie Protocol

As title says I'm trying to implement a secure cookie protocol HMAC(username|expiration name|data|session key, sk) It seams that session key is not constant during whole application session ...
8
votes
2answers
7k views

OAuth access token vs session key

Is there any advantage to OAuth vs cookie-based sessions (established via username/password) under the following assumptions? There is only one legitimate client to the service The OAuth client ...
3
votes
2answers
3k views

Why are CSRF tokens necessary?

It seems that the entire problem could be solved very elegantly by simply adding a new flag to the HTTP cookie specification. Similarly to how cookies flagged Secure will only be submitted by the ...
3
votes
2answers
392 views

Security concerns about my webapp

I read though OWASP very carefully, but I am not sure about some parts of my website. I am using jbcrypt on my website. It stores the salt in the hash itself something like this hash+salt. I read ...
0
votes
1answer
100 views

What is a preferred method of security-conscious creation of login cookies [duplicate]

Possible Duplicate: Is it safe to store the password hash in a cookie and use it for “remember-me” login? I am working on a webapp that uses localStorage alone ...
7
votes
3answers
4k 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 ...
14
votes
4answers
3k views

Why users want to disable cookies?

I just started to create a new web application. In the documentation, it is written that I have to prepare for the situation where users have disabled cookies. This is not the first time I have read ...
13
votes
3answers
4k views

What risks do Cookieless sessions have? What are the mitigations?

I'm debating if I should support cookieless sessions in my web app. It would look something like this: http://www.example.com/(S(lit3py55t21z5v55vlm25s55))/orderform.aspx Since the URL is never ...
4
votes
1answer
1k views

How to detect cookie stuffing attacks?

So the question is how to detect cookie stuffing attacks and how to protect against them? In case of image-based cookie stuffing I can detect that related resources are not loaded and therefore ...
1
vote
2answers
529 views

MITM session injection/invalidation

When sending a cookie back to the server, the browser does not send back the "secure" flag: the server cannot check whether the sent cookie really come from the "secure" origin (https://example.com). ...
-1
votes
1answer
149 views

Comparing cookie values with page parameters (i.e. href)

Could you suggest if there is any reason to compare cookie value domain, path, etc with web "location.href" and so on? I mean - on the client side.
1
vote
3answers
438 views

Is this approach of securing cookie secure?

I could not find writeups about secure cookies so I have done some thinking. (I already have a "secure" password database with bcrypt and salt) Steps: User logs in Save user IP + randomstring in ...
7
votes
5answers
2k views

What do the various browser “private modes” do?

Recently there has been some disagreement as to what "private mode" means when it comes to various browsers. Primarily I am referring to... IE's "InPrivate Browsing" Google Chrome's "Incognito ...
3
votes
4answers
214 views

Improving the privacy of a casual Web user

I am interested in improving the privacy available to me as a casual internet user with a default browser. I think that Tor is too slow and that the "Privacy Mode" in browsers isn't really practical. ...